manipulacion de cables - compendio

8/12/2019 Manipulacion de Cables - Compendio

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PREFACIO

Durante el perodo entre junio de 1998 y julio 2001, en las minas de Queensland, de todos

los accidentes e incidentes reportados de carcter elctrico, aproximadamente el 20%

estaban relacionados con el arrastre de cables. 7% de los incidentes se relacionaron con el

arrastre de cables en minas de carbn subterrneas y con un riesgo de explosin, mientras

3% de los incidentes implic la liberacin incontrolable de energa en cables de arrastre.

Haba 34 incidentes informados donde se presentaron arcos elctricos expuestos.

El Departamento de NSW de Recursos Naturales, con la cooperacin de empresas

reparadoras de cables aprobadas, reuni datos sobre daos en los cables de arrastre

instalados en zonas de peligro en minas de carbn subterrneas. Los resultados para los

primeros seis meses se muestran en la siguiente tabla.

DAOS EN LOS CABLES - MINAS DE CARBON SUBTERRANEAS01/04/2001 A 30/09/2001

Tipo deCable

Numero decables

daados

Numero dechaquetasdaadas

Numero decables conchaquetadeslizada

Numero decables conevidenciade arco

Numero decables con

tierrasrotas

Minero 496 1241 6 44 15

Shuttle Car 1308 5642 58 76 156

Longwall 277 453 2 5 2

Feeder 294 264 1 5 13

Other 612 1128 8 11 25

TOTAL 2987 8728 75 141 211

El nmero promedio de arcos informados en una zona peligrosa por los cinco aos

1994/95 a 1998/1999 es 11 para un perodo de seis meses. La evidencia de arcos segn los

datos recolectados con las empresas reparadoras de cables es de 141 por el mismo

periodo.

Se debe notar que los reparadores de cable han identificado que el arco se ha contenido

dentro de la chaqueta del cable en la inmensa mayora de casos. Esto indica que el diseo

de los cables de arrastre (AS/NZS1802) utilizado en minas de carbn, es efectivo en

contener el arco. Otra estadstica interesante de los datos del dao en cables, es que paracada cable que falla y se repara hay aproximadamente otros 3 con daos en la chaqueta.

Cada uno de stos daos en la chaqueta, inclusive pequeos agujeros, son fuente

potencial de ignicin en un ambiente de atmsfera peligrosa. Ellos representan tambin un

peligro indirecto para el personal minero de maniobra.

El fracaso del aislamiento en un cable de arrastre que opera en el frente de trabajo de una

mina de carbn subterrneo es causa potencial de una catstrofe por la ignicin del

metano y la carbonilla. Una explosin del metano o de carbonilla en una mina subterrnea

puede causar la prdida de vidas, la prdida de la mina y la prdida de ese recurso de

carbn.

Todos los mineros que manejan cables o que trabajan muy cerca de aparatos con cablesestn expuestos tambin a otros peligros; por ejemplo, el manejo manual de cables


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pesados, el contacto directo e indirecto con liberacin incontrolable de energa por

cortocircuito como resultado de trabajar con cables de arrastre daados.

Siete de los incidentes mencionados en la tabla, implicaron fallas de cortocircuito en los

enchufes, fracasando catastrficamente el enchufe debido a su desintegracin.

Afortunadamente no se presentaron heridas personales. El factor que salva en muchos

incidentes es simplemente la separacin en el tiempo y el espacio. Hay sin duda, muchos

ms incidentes no reportados que involucran a los cables de arrastre.

Los principales incidentes que implican cables de arrastre, ocultan varias causas raz,

incluyendo:

(a) El diseo inadecuado del equipo, incluyendo accesorios de cable tales comoenrolla cables y enchufes.

(b) Procedimientos de operacin y maniobra inadecuados.(c) Fallar al no observar los procedimientos de operacin.(d) Inadecuado mantenimiento o debilidad en el mantenimiento.(e) La falta en la comprensin de los peligros y riesgos asociados a los cables de

arrastre.

(f) Problemas culturales y de conducta(g) La existencia de personas que creen que algo malo no les puede suceder a ellos

o que no puede suceder en su mina

(h) La creencia de que los cables de arrastre no son un bien de capital y que debenser tratados como artculos desechables o consumibles.

(i) La creencia de que los cables de arrastre recibirn severos daos y que estosdaos son simplemente inevitables.

(j) Deficiente cultura en el lugar de trabajo. Por ejemplo, Nosotros siempredaamos los cables, daar los cables se acepta como parte de la manera en que

nosotros hacemos las cosas por aqu.

(k) Procedimientos y tcnicas inadecuados para la investigacin de accidentes eincidentes

(l) Deficiencia en sistemas y procedimientos preventivos y correctivos.(m) Fallar en no observar las especificaciones de los fabricantes y sus criterios de

diseo; por ejemplo, La operacin contina dentro del radio de mnimo de

curvatura permisible del cable.

Se requiere un cambio significativo del paradigma con respecto a la manera en que se

arrastran los cables y se manejan los riesgos y de cmo el resultado involucra la

productividad y seguridad en las minas. Estas lneas procuran proporcionar una gua en la

administracin de estos asuntos con miras a proporcionar un proceso de cambio para

llevar al mximo la vida de cable y aminorar los riesgos en la operacin del mismo.


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AUSPROOFmanipulacin de cables energiza


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Incrementar las horas opIncrementar las horas opmaquina.maquina.

Disminuir los actos inseguros.Disminuir los actos inseguros. Disminuir los daDisminuir los daos con o sin peros con o sin per


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Maquinas, EquMaquinas, EquHerramientasHerramientas

Generalidades de Generalidades de Cables.Cables.

EPP especifico requeridEPP especifico requerid Maquinas requeridas.Maquinas requeridas. Herramientas.Herramientas.


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GeneralidadesGeneralidadesUn cable de Un cable de apantallado, presapantallado, pres

sus lsus lneas de neas de magnmagntico ( energtico ( energcuando es instaladcuando es instaladde un punto a tiede un punto a tieruna variaciuna variacin sin sivoltajes electrovoltajes electro

aplicados al aislaaplicados al aisla

Un cable de alto vUn cable de alto vpresenta lpresenta lneas dneas dmagnmagntico uniftico unifoelectrostelectrosttica ) tica )

instalado en lasinstalado en laspunto a tierra. Rpunto a tierra. Rdistribucidistribucin hon homvoltajes electrovoltajes electroaplicados al aislaaplicados al aisla


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GeneralidadesGeneralidades

Dimetros de curvatura mnima (SHD-GCalibre2KV 5KV 8KV 15K

2 19 22 34 39

1 21 23 35 40

1/0 21 23 35 40

2/0 24 26 39 44

3/0 26 28 42 46

4/0 28 30 44 49

350 34 35 51 56

500 38 40 57 61


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Amperios (SHD)

Calibre mm2 2KV 5KV 8KV 15K

2 159 159 159 164

1 35 184 184 184 187

1/0 50 211 211 211 215

2/0 243 243 243 246

3/0 70 279 279 279 283

4/0 95 321 321 321 325

350 435 435 435 -

500 240 536 536 536 -


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GeneralidadesGeneralidadesTENSIONES MAXIMAS DEL CABLETENSIONES MAXIMAS DEL CABLE

AplicaciAplicacinn

Tipo de CableTipo de Cable MMxima Fuerza xima Fuerza

Trabajo Segura (STrabajo Segura (SN/mm2N/mm2

Chaqueta noChaqueta noreforzada.reforzada.

1515

ChaquetaChaquetareforzada.reforzada.

2020

Chaqueta noChaqueta no

reforzadareforzada..

2020

ChaquetaChaquetareforzada.reforzada.

3030

ArrastreArrastre

EnrolladoEnrollado

MMxima Tensixima Tensin de Arrastre.n de Arrastre.

T = nT = n xx CSACSA xx SWFSWF

Donde:Donde:TT == TensiTensin en newtons. (N)n en newtons. (N)NN == Numero de conductores del cable.Numero de conductores del cable.CSACSA == rea de la seccirea de la seccin transversal de los conductores. Descartarn transversal de los conductores. Descartar

pantallas y chaquetas. (mm2)pantallas y chaquetas. (mm2)SWFSWF== Fuerza de trabajo segura. (N/mm2)Fuerza de trabajo segura. (N/mm2)


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GeneralidadesGeneralidadesMMxima Longitud de Arrastre.xima Longitud de Arrastre.

L = T / (fL = T / (f xx WW xx 10)10)

Donde:Donde:LL == MMxima longitud a ser arrastrada. (xima longitud a ser arrastrada. (mtsmts))TT == TensiTensin en newtons.n en newtons.

ff == Coeficiente de fricciCoeficiente de friccin entre el cable y la superficie. 0.5n entre el cable y la superficie. 0.5para superficies secas. Si se desea considerar el peorpara superficies secas. Si se desea considerar el peorde los casos, utilizar coeficiente de 0.7de los casos, utilizar coeficiente de 0.7

WW == Masa del cable en kilogramos por metro. (Masa del cable en kilogramos por metro. (KgKg//mtsmts))

Nota: En el punto tangencial del doblez, se presentan fuerzas contrapuestas de tensilo tanto, al utilizar lazos para el arrastre de cables, se deber dividir entr

formula de mxima longitud de arrastre.

MMxima Longitud de Suspensixima Longitud de Suspensin.n.

L = T / (WL = T / (W xx 9.8)9.8)

Donde:Donde:LL == MMxima longitud a suspender. (xima longitud a suspender. (mtsmts))TT == TensiTensin en newtons.n en newtons.WW == Masa del cable en kilogramos por metro. (Masa del cable en kilogramos por metro. (KgKg//mtsmts))9.89.8 == Fuerza de la gravedad.Fuerza de la gravedad.


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GeneralidadesGeneralidadesCABLES, RASGOS Y CARACTERCABLES, RASGOS Y CARACTERSTICASSTICAS

RasgoRasgo CaracterCaractersticastica

ConstrucciConstruccin standard deln standard delconductor.conductor. Medianamente flexible yMedianamente flexible ygran robustez.gran robustez. FlexibilidFlexibilidresistenciresistencia

Conductores superflexiblesConductores superflexibles Mayor flexibilidadMayor flexibilidad Provee mProvee mcurvaturacurvaturamenores rmenores r

posibles. Eposibles. Emayor canmayor candidimetrosmetros

AislamientoAislamiento Aislamiento de altoAislamiento de altogradogrado

Provee intProvee intcable a tocable a todtil.til.

Pantallas semiconductorasPantallas semiconductorasextruidas.extruidas.

Semi conducciSemi conduccin.n. Baja resisBaja resistierra alretierra alreconductorconductor

performanperforman

perjudicaperjudicaPantallas de metal trenzado.Pantallas de metal trenzado. Alta conductividad.Alta conductividad. PrevenciPrevenci

circuito, ecircuito, epuesta a tpuesta a tresistenciresistencia


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CABLES, RASGOS Y CARACTERCABLES, RASGOS Y CARACTERSTICASSTICAS


Tierras intersticialesTierras intersticiales Fortaleza mecFortaleza mecnicanica Reemplaza Reemplaza len cables quen cables qumanipuladomanipulado

Piloto intersticial.Piloto intersticial. Piloto aislado.Piloto aislado. Los pilotos sLos pilotos scircuitos de circuitos de

piloto centrapiloto centradidimetro.metro.

Tierras semiconductoras.Tierras semiconductoras. Semi conducciSemi conduccinn Presenta bajPresenta bajnncleo de uncleo de un

facilitando facilitando circuito a ticircuito a ti

Soporte CentralSoporte Central Soporte a los nSoporte a los ncleos.cleos. Provee sopoProvee soporel aplastamel aplastam

MayormenteMayormente

por lo tanto,por lo tanto,fase a fase sfase a fase sUsualmenteUsualmentecentral.central.


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GeneralidadesGeneralidadesCABLES, RASGOS Y CARACTERCABLES, RASGOS Y CARACTERSTICASSTICAS


Piloto CentralPiloto Central ExtensibleExtensible Provee seguridProvee seguridtrabajo con el ctrabajo con el cestiramientos destiramientos drompa la lrompa la lneaneacircuitos de mocircuitos de moapertura de losapertura de losque el cable se que el cable se El cable tipo 42El cable tipo 42

piloto centralepiloto centrales

ExtrusiExtrusin semin semiconductiva sobre losconductiva sobre losconductores.conductores.

Semi conducciSemi conduccin.n. Provee una panProvee una panconductor con conductor con hacia los condhacia los condu

presentarse algpresentarse algchaqueta aislachaqueta aisla

falla serfalla serpuespues

Chaqueta reforzadaChaqueta reforzada Cintas o hilos de granCintas o hilos de granfortaleza.fortaleza.

Provee fortalezProvee fortalezchaqueta y al cchaqueta y al caplastamientosaplastamientoscable.cable.


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EPPEPP

Guantes AislanGuantes AislanPara la manPara la mande los cables.de los cables.Evitan la eEvitan la e

personal por personal por aislamiento enaislamiento en

detectado.detectado.

Herramientas

Las guardas de cueroLas guardas de cueroincrementan la vidaincrementan la vida til de lostil de los

guantes aislantes y conservan laguantes aislantes y conservan laconfiabilidad del aislamientoconfiabilidad del aislamiento

protector.protector.


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MaquinaMaquinaTractor sobTractor sobaditamento aditamento

cables.cables.Para el tendiPara el tendillneas de alimneas de alimhacia la maqhacia la maqEl brazo faciEl brazo facibermas.bermas.

Moto niveladorMoto niveladorPara el arrastPara el arrastlos arregloslos arreglos herramientas herramientas

adelante.adelante.


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MaquinaMaquina

CamiCamin mann manTransporte Transporte encargado cencargado c

patines y otpatines y otaccesorios reaccesorios redda.a.

Puede ser haPuede ser hatendido detendido de

alimentacialimentacinnpala o perforpala o perfor


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HH

Tambores:Tambores:

Para el transporte, Para el transporte, almacenamiento efialmacenamiento efiEvita exponerlos al dEvita exponerlos al dSeparaciSeparacin del enchn del enchcontacto de la chaqucontacto de la chaqude este.de este.

PatPatn Porta Cables:n Porta Cables:

Para el transporte ePara el transporte eEvita exponerlos al dEvita exponerlos al dSe debe utilizar el aSe debe utilizar el aocho para no alterarocho para no alterardel cable.del cable.


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PatPatn Jala Cables con Jala Cables coPara la reconfigPara la reconfig

tendidos de alimentatendidos de alimentaEvita exponer al caEvita exponer al caexcesivas que deterexcesivas que deterexceden los limiteexceden los limite

jalado.jalado.El largo del lazo nEl largo del lazo n30mts.30mts. ( Cables 350 y 500MCM, ( Cables 350 y 500MCM,

HH

PatPatn Protector de Jn Protector de JPara la reconfigPara la reconfig

tendidos de alimentatendidos de alimentaEvita exponer la junEvita exponer la juntensitensin, atrapamin, atrapamivisibilidad y contamvisibilidad y contam


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HH

Gancho para cablesGancho para cables

No suplen el uso de gNo suplen el uso de gProveen ergonomProveen ergonoma,a,de flexiones, las poside flexiones, las posilumbares y aleja al lumbares y aleja al cClic aquClic aqu.

Eslingas & sogas:Eslingas & sogas:No suplen el uso de gNo suplen el uso de g

Permite habilitar pPermite habilitar pffcilmente. De usacilmente. De usaesta deberesta deber ser insser ins

menos dos puntos demenos dos puntos deusarse sogas, se debusarse sogas, se debde la fotografde la fotografa paa parrea de contacto y drea de contacto y d

por deslizamiento depor deslizamiento de


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ProcProcInIn

IntroducciIntroduccin.n. Peligros tPeligros tpicos y supicos y su

mecanismos para smecanismos para srealizacirealizacin.n. Etapas requeridas para uEtapas requeridas para u

sistema de administracisistema de administracide cables exitoso.de cables exitoso.


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InIn

Los sistemas de administraciLos sistemas de administracin de cables deben ser concebidon de cables deben ser concebido

eliminen, tanto como sea posible, la manipulacieliminen, tanto como sea posible, la manipulacin directa de n directa de energizados. No se recomienda la manipulacienergizados. No se recomienda la manipulacin directa de cables den directa de cables de

disediseo de los cables y sus accesorios proporcionan la adecuada o de los cables y sus accesorios proporcionan la adecuada p

contra la exposicicontra la exposicin a la energn a la energa ela elctrica.ctrica.

La razLa razn de esto es que la condicin de esto es que la condicin del cable no puede ser sabida. Ln del cable no puede ser sabida. L

presente antes, durante o por la manipulacipresente antes, durante o por la manipulacin de estos.n de estos.

Las maquinas de manipulaciLas maquinas de manipulacin, ganchos o las cuerdas aisladan, ganchos o las cuerdas aislada

voltaje, entre otros, se deben utilizar para proporcionar protecvoltaje, entre otros, se deben utilizar para proporcionar proteccicinn

durante la manipulacidurante la manipulacin de los cables de arrastre energizados. Esn de los cables de arrastre energizados. Es

ayudan atenuando los riesgos elayudan atenuando los riesgos elctricos, sino que tambictricos, sino que tambin, asisn, asist

trabajo manual.trabajo manual.

De ser inevitable la manipulaciDe ser inevitable la manipulacin manual de cables de arrastre en manual de cables de arrastre erecomendacirecomendacin, proceder con un ann, proceder con un anlisis de riesgo que resulte enlisis de riesgo que resulte en

trabajo escrito donde los riesgos y sus controles se encuentrentrabajo escrito donde los riesgos y sus controles se encuentrenplenamplenam


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InIn

Los tiempos de vida posibles con parLos tiempos de vida posibles con parmetros de seguridad y sermetros de seguridad y ser

cables de arrastre en minas a tajo abierto son:cables de arrastre en minas a tajo abierto son:

Minas a tajo abierto con buenas practicas de manipulaciMinas a tajo abierto con buenas practicas de manipulacin y un mn y un m

del cable:del cable:

Cables de las bombas y perforadorasCables de las bombas y perforadoras Hasta 20Hasta 20

Cables de palas.Cables de palas. Hasta 20Hasta 20

Cables de dragalinasCables de dragalinas Hasta 20Hasta 20

Minas a tajo abierto sin practicas de manipulaciMinas a tajo abierto sin practicas de manipulacin y sin un man y sin un man

cable:cable:

Cables de las bombas y perforadorasCables de las bombas y perforadoras De 3 a 7 aDe 3 a 7 a

Cables de palas.Cables de palas. De 3 a 7 aDe 3 a 7 a

Cables de dragalinasCables de dragalinas De 3 a 7 aDe 3 a 7 a


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Riesgos TRiesgos TppMecanismos deMecanismos de

Algunos RiesgosAlgunos RiesgosTTpicospicos

Algunos mecanismos tAlgunos mecanismos tpicos picos

Contacto directo con losContacto directo con los

conductores del cable o conconductores del cable o con

los accesorios de este, taleslos accesorios de este, tales

como los enchufes.como los enchufes.

Cable defectuoso con exposiciCable defectuoso con exposicin de conductoren de conductore

protecciproteccin en detectar la falla.n en detectar la falla.

Enchufes defectuosos exponiendo conductores Enchufes defectuosos exponiendo conductores

conectadas a bornes incorrectos, no existen o haconectadas a bornes incorrectos, no existen o ha

Contacto indirecto delContacto indirecto del

personal con un cablepersonal con un cabledefectuoso.defectuoso.

Falla en la protecciFalla en la proteccin y procedimientos parn y procedimientos par

falla.falla.DDbil o carente control de procedimientos parabil o carente control de procedimientos para

PequePequeos hoyos en la chaqueta posibilitando dos hoyos en la chaqueta posibilitando d

InducciInduccin de alto voltaje en la ln de alto voltaje en la lneas de bajo vneas de bajo v

debido a la carencia de la segregacidebido a la carencia de la segregacin de las fasn de las fas

Uso de cables no apantallados o que no cuentaUso de cables no apantallados o que no cuenta

( Segregaci( Segregacin de fases por tierra ) AS/NZS 180n de fases por tierra ) AS/NZS 180

Deficiente diseDeficiente diseo de puesta a tierra o la falta o de puesta a tierra o la falta

de falla a tierra o limitadores de falla a tiede falla a tierra o limitadores de falla a tieenclavamientos mecenclavamientos mecnicos (nicos (locklock--out) en la puestout) en la puest


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Riesgos TRiesgos TppMecanismos deMecanismos de

Agresiones mecAgresiones mecnicas a losnicas a los

cables.cables.Deficiente mantenimiento a los enrolla cables yDeficiente mantenimiento a los enrolla cables y

OperaciOperacin deficiente en el enrollado y desenrn deficiente en el enrollado y desenr

tambores.tambores.Impactos de roca provocados por el giro del baImpactos de roca provocados por el giro del ba

sobre los cables sin proteccisobre los cables sin proteccin.n.

CaCadas de rocas desde los taludes.das de rocas desde los taludes.

CaCadas a nivel durante la manipulacidas a nivel durante la manipulacin.n.

Maquinaria circulando cerca o sobre los cablesMaquinaria circulando cerca o sobre los cables

OperaciOperacin del cable en o por debajo de sus van del cable en o por debajo de sus va

de curvatura.de curvatura.

Amarres pobres y remolcados deficientes.Amarres pobres y remolcados deficientes.AbrasiAbrasin de la chaqueta por un arrastre son de la chaqueta por un arrastre so

inadecuadas.inadecuadas.

Camiones de acarreo circulando con la tolva leCamiones de acarreo circulando con la tolva le

cables.cables.

DaDao muscular y/o delo muscular y/o del

esqueleto.esqueleto.ManipulaciManipulacin manual de los cables y sus accesn manual de los cables y sus acces

ConexiConexin y/o desconexin y/o desconexin no asistida de los enn no asistida de los en

Practicas de manipulaciones no establecidas o Practicas de manipulaciones no establecidas o

Efectos en la saludEfectos en la salud Moler, quemar u otros mecanismos que exponenMoler, quemar u otros mecanismos que exponen

Ignorancia de los riesgos yIgnorancia de los riesgos y

peligros.peligros.Falta de entrenamiento en trabajos de riesgo.Falta de entrenamiento en trabajos de riesgo.

Pobre actitud y/o culturaPobre actitud y/o cultura

relacionada a la seguridadrelacionada a la seguridadLiderazgo organizacional deficiente.Liderazgo organizacional deficiente.


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Etapas RequerEtapas RequerSistema de AdmSistema de Adm

de Cablesde Cables

Obtener la atenciObtener la atencin, intern, inters y coms y comla organizacila organizacin y sus trabajadoresn y sus trabajadores

Desarrollo de procedimientos y oDesarrollo de procedimientos y o

herramientas y equipamiento.herramientas y equipamiento. Entrenamiento anual y seguimientEntrenamiento anual y seguimient Mantener la atenciMantener la atencin, intern, inters y coms y com


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Obtener la atenciObtener la atencicompromiso de la ocompromiso de la o

y sus trabajy sus trabaj

Los trabajadores que no toman atenciLos trabajadores que no toman atencin a los actos inseguros, dejan a los actos inseguros, deja

compacompaeros de trabajo, pues la acumulacieros de trabajo, pues la acumulacin de losn de los relajosrelajosdiariodiario

Actividades sub. estActividades sub. estndares producen mas actividades sub. estndares producen mas actividades sub. estndanda

Una condiciUna condicin defectuosa no detectada, no reportada y no superadan defectuosa no detectada, no reportada y no superada

a un meca un mecnico, pero en alta tensinico, pero en alta tensin, puede costarle la vida de un elen, puede costarle la vida de un ele

La difusiLa difusin fotogrn fotogrfica de un accidente por electrocucifica de un accidente por electrocucin, es la mejon, es la mejo

atenciatencin, intern, inters y compromiso de la organizacis y compromiso de la organizacin y sus trabajadoren y sus trabajadore

Los receptores del mensaje observan las consecuencias reales deLos receptores del mensaje observan las consecuencias reales de lolos

Se concluye que la muerte de un compaSe concluye que la muerte de un compaero de trabajo es totalmero de trabajo es totalm

me puede ocurrir a mime puede ocurrir a mi..

Como consecuencia, los asistentes atenderComo consecuencia, los asistentes atendern con intern con inters y se coms y se compla muerte de un compala muerte de un compaero o la suya propia.ero o la suya propia.

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Obtener la atenciObtener la atencicompromiso de la ocompromiso de la o

y sus trabajy sus trabajDifundir reglas bDifundir reglas bsicas en un cuadro sinsicas en un cuadro sinptico. Una propuesta de eptico. Una propuesta de e

Cuida los cables de arrastre, salvaras una vidaCuida los cables de arrastre, salvaras una vidaCuida los cables de arrastre, salvaras un puestCuida los cables de arrastre, salvaras un puest

Considera como energizado cualquier cable de Considera como energizado cualquier cable de aReporta los cables defectuosos inmediatamReporta los cables defectuosos inmediatame

Nunca uses una soga con las cables sin guantesNunca uses una soga con las cables sin guantesSiempre utiliza los mSiempre utiliza los mtodos apropiados para cruzatodos apropiados para cruzaSiempre utiliza procedimientos aprobados para manipulSiempre utiliza procedimientos aprobados para manipul

accesoriosaccesorios..

Utilizar los hUtilizar los hbitos mineros a favor como medio recordatorio. Por ejbitos mineros a favor como medio recordatorio. Por ej

adhesiva para el casco.adhesiva para el casco.


31/84

Desarrollo de proDesarrollo de proy obtenciy obtencin de hen de he

equipamequipamiA continuaciA continuacin se propone un desarrollo bn se propone un desarrollo bsico de los procedimientsico de los procedimient

sinsinptico anterior:ptico anterior:

1.1.-- Considera como energizado cualquier cable de arrastre.Considera como energizado cualquier cable de arrastre.

1.1.1.1.--Perdida de energPerdida de energa en el equipo.a en el equipo.

1.1.1.1.1.1.-- Que hacer.Que hacer.

1.1.2.1.1.2.--A quien llamar.A quien llamar.

2.2.-- Reporta los cables defectuosos inmediatamente.Reporta los cables defectuosos inmediatamente.2.1.2.1.-- InspecciInspeccin de cables de arrastre.n de cables de arrastre.

2.1.1.2.1.1.-- Que buscar y como encontrarlo.Que buscar y como encontrarlo.

2.1.2.2.1.2.-- Que hacer.Que hacer.

3.3.-- Nunca uses una soga con las cables sin guantes de alta.Nunca uses una soga con las cables sin guantes de alta.

3.1.3.1.-- ManipulaciManipulacin y maniobras con cables de arrastre.n y maniobras con cables de arrastre.

3.1.1.3.1.1.-- Nunca jalar mas de 30mts.Nunca jalar mas de 30mts.

3.1.2.3.1.2.-- Como usar los aditamentos del camiComo usar los aditamentos del camin dn d

3.1.3.3.1.3.-- VehVehculos ligeros solo pequeculos ligeros solo pequeas longitudeas longitude

3.1.4.3.1.4.-- El uso de vehEl uso de vehculos pesados para el arrasculos pesados para el arras

de un supervisor.de un supervisor.


32/84


equipamequipami4.4.-- Siempre utiliza los mSiempre utiliza los mtodos apropiados para cruzar los cables.todos apropiados para cruzar los cables.

4.1.4.1.-- Como cruzar los cables.Como cruzar los cables.4.1.1.4.1.1.-- Los cruza cables.Los cruza cables.

4.1.2.4.1.2.-- VehVehculos que pueden usar los cruza cablculos que pueden usar los cruza cabl

4.1.3.4.1.3.-- Ganchos para cables en cada vehiculo quGanchos para cables en cada vehiculo qu

operacioperacin.n.

4.2.4.2.-- Como izar los cables, como enterrarlos.Como izar los cables, como enterrarlos.

4.2.1.4.2.1.-- EstEstndares internacionales aplicables.ndares internacionales aplicables.

5.5.-- Siempre utiliza procedimientos aprobados para manipular los cSiempre utiliza procedimientos aprobados para manipular los c

5.1.5.1.--Almacenamiento de cables de arrastre.Almacenamiento de cables de arrastre.

5.1.1.5.1.1.--PreparaciPreparacin de una plataforma (n de una plataforma (yardyard) p) p

5.1.2.5.1.2.-- Que hacer con los cables operativos, los nQue hacer con los cables operativos, los n

dados de baja.dados de baja.

5.1.3.5.1.3.-- Requerimientos para la reparaciRequerimientos para la reparacin de can de ca

5.2.5.2.-- Eslingas & sogas para cables.Eslingas & sogas para cables.

* Que es lo mas adecuado, sigue sin poder deter* Que es lo mas adecuado, sigue sin poder deter

5.2.1.5.2.1.-- Eslingas, colocarla sobre el suelo, mover Eslingas, colocarla sobre el suelo, mover

eslinga.eslinga.

5.2.2.5.2.2.-- Uso deUso de 3/83/8polypoly roperope, es no conductiva , es no conductiva y

5.2.3.5.2.3.-- Uso de los guantes de alta.Uso de los guantes de alta.


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equipamequipami

5.3.5.3.-- Incrementando o disminuyendo la lIncrementando o disminuyendo la lnea ennea en5.3.1.5.3.1.-- Uso del manipulador de cablesUso del manipulador de cables.

5.3.2.5.3.2.-- Corte y reposiciCorte y reposicin de energn de energa.a.

5.3.3.5.3.3.-- ManipulaciManipulacin del cable de palan del cable de pala

camiones y otros equipos pesadcamiones y otros equipos pesad

5.3.4.5.3.4.-- ManipulaciManipulacin del cable con camn del cable con cam

longitudes.longitudes.

5.4.5.4.-- ManipulaciManipulacin y maniobra de enchufes.n y maniobra de enchufes.5.4.1.5.4.1.-- Corte y reposiciCorte y reposicin de energn de energa (a (dd

5.4.2.5.4.2.-- ConexiConexin y desconexin y desconexin mecn mecnini

5.4.3.5.4.3.-- Uso del patUso del patn CS15.n CS15.

5.4.3.1.5.4.3.1.-- InspecciInspeccin den deprepre--uus

5.4.3.2.5.4.3.2.--Anclaje del empalmAnclaje del empalm

5.4.3.3.5.4.3.3.--Puntos de remolquePuntos de remolque

5.4.3.4.5.4.3.4.-- Remolque del CS15Remolque del CS155.4.4.5.4.4.-- Uso del pedestal RST15.Uso del pedestal RST15.

5.4.4.1.5.4.4.1.-- InspecciInspeccin den deprepre--uus

5.4.4.2.5.4.4.2.--Anclaje del empalmAnclaje del empalm

5.5.5.5.-- ManipulaciManipulacin de cables con la pala.n de cables con la pala.

5.5.1.5.5.1.-- Enrolla cable.Enrolla cable.

5.5.2.5.5.2.-- Esfera.Esfera.


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equipamequipami5.6. Contacto directo con el cable.5.6. Contacto directo con el cable.

5.6.1.5.6.1.-- Contacto directo no permitido bContacto directo no permitido bcircunstancia.circunstancia.

5.75.7-- Uso apropiado de los ganchos para cables.Uso apropiado de los ganchos para cables.

5.7.1.5.7.1.-- Como usarlo.Como usarlo.

5.7.2.5.7.2.-- Como no usarlo.Como no usarlo.

5.7.3.5.7.3.-- Como guardarlo.Como guardarlo.

5.8.5.8.--Protegiendo los cables de arrastre.Protegiendo los cables de arrastre.

5.8.1.5.8.1.-- InformaciInformacin del fabricante.n del fabricante.

5.8.2.5.8.2.-- Uso de bermas.Uso de bermas.

5.8.3.5.8.3.-- Uso de conos u otros tipos de seUso de conos u otros tipos de se

5.9.5.9.-- Cuidados y usos de los guantes de alta.Cuidados y usos de los guantes de alta.

5.9.1.5.9.1.-- InspecciInspeccin den deprepre--uso.uso.

5.9.2.5.9.2.--Pruebas semestrales requeridasPruebas semestrales requeridas

5.10.5.10.-- Cuidados de los cables en zonas de voladuCuidados de los cables en zonas de voladu

5.10.1.5.10.1.--ProtecciProteccin del cable por si quen del cable por si que

5.10.2.5.10.2.-- Retiro del cable de una zona dRetiro del cable de una zona d

5.11.5.11.-- Uso de reportes de falla, reportes de reparUso de reportes de falla, reportes de repar

5.11.1.5.11.1.-- EtiquetasEtiquetas Fuera de ServicioFuera de Servicio

5.11.2.5.11.2.-- Historial deHistorial de Eventos del CablEventos del Cabl

apaptulos, 16 ttulos, 16 ttulos y 41 subttulos y 41 subttulos, de los cuales 1 titulo y 4 captulos, de los cuales 1 titulo y 4 captulos esttulos estn relacionados a los enchufes. Dime como tratasn relacionados a los enchufes. Dime como tratas


35/84

RetoRetoCaso Mina Poli metCaso Mina Poli metlica:lica:Entre Enero del 2003 a Mayo del 2004, se registranEntre Enero del 2003 a Mayo del 2004, se registran

la flota, 310 horas dela flota, 310 horas de Maquina no OperativaMaquina no Operativaconfiabilidad en el suministro de energconfiabilidad en el suministro de energa.a. ( 17.22 hora( 17.22 hora

Se investigan las causas raSe investigan las causas raz y se desarrollanz y se desarrollanincrementar la confiabilidad en el suministro de enincrementar la confiabilidad en el suministro de ense implementaron en su totalidad en Octubre del se implementaron en su totalidad en Octubre del 2hacia enchufes AusProof)hacia enchufes AusProof)

Entre Octubre del 2004 a Diciembre del 200Entre Octubre del 2004 a Diciembre del 200oficialmente en la flota, 145.9 horas deoficialmente en la flota, 145.9 horas de MaquinMaquinimputables a la confiabilidad en el suministro deimputables a la confiabilidad en el suministro dehoras mensuales )horas mensuales )

Como resultado del uso de enchufes Ausproof:Como resultado del uso de enchufes Ausproof:Se disminuyo al 60.51% las fallas imputables aSe disminuyo al 60.51% las fallas imputables aenergenerga.a.Se recuperaron 81.6 horas operativas anuales de la Se recuperaron 81.6 horas operativas anuales de la

Cual fue la base para lograr esta mejoraCual fue la base para lograr esta mejora


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RetoReto

a)a) La mina del ejemplo ya contaba con un sistema La mina del ejemplo ya contaba con un sistema

de cables de arrastre.de cables de arrastre.b) La utilizacib) La utilizacin de enchufes AusProof caracterizadosn de enchufes AusProof caracterizadosb.1) No estar basados en el arreglo tradicional hemb.1) No estar basados en el arreglo tradicional hem

Minimizando las existencias y el valor Minimizando las existencias y el valor almacenes. Incrementando la confiabilidad almacenes. Incrementando la confiabilidad energenerga al minimizar los componentes ina al minimizar los componentes inconexiconexin eln elctrica en serie.ctrica en serie.

b.2) La segregacib.2) La segregacin de fases por tierra eln de fases por tierra elctrica ctrica lo largo y en toda la seccilo largo y en toda la seccin transversal dn transversal davance tecnolavance tecnolgico de los cables de fagico de los cables de faindividualmente continua sin perderse en todindividualmente continua sin perderse en todelimina la posibilidadelimina la posibilidad dedefallasfallas fase a fase enfase a fase en

b.3) Las descargas parciales (efecto corona) son mb.3) Las descargas parciales (efecto corona) son m

teltelfono mfono mvil. Nuestro aislamiento vil. Nuestro aislamiento prematuramenteprematuramente. La expectativa. La expectativa dede vidavida en en senchufe puede ser mayor a 10 aenchufe puede ser mayor a 10 aos.os.


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IIR

Actual Mine Shovel Power Cable HandlingActual Mine Shovel Power Cable HandlingTechniques (by Martin Reyes deTechniques (by Martin Reyes de GoldstrikeGoldstrikeMinMinInc.Inc.--BarrickBarrick))

Portable Power Cable Use and Repercussions oPortable Power Cable Use and Repercussions oImproper Handling ( by Mark Fuller dImproper Handling ( by Mark Fuller d

AmerCableAmerCable).). Guide for use of trailing and reeling cables inGuide for use of trailing and reeling cables in

mines ( by Standards Australia & Standardmines ( by Standards Australia & Standard

New Zealand )New Zealand ) Western Mining Electrical Association (Western Mining Electrical Association ( popo

Lynn D. Nelson, Senior Reliability EngineerLynn D. Nelson, Senior Reliability EngineerKennecott Utah Copper ).Kennecott Utah Copper ).

Dozer cable handler 1.Dozer cable handler 1. Dozer cable handler 2.Dozer cable handler 2. Shovel propelling.Shovel propelling. TTcnicas para la reparacicnicas para la reparacin y empalmes dn y empalmes d

cables.cables.


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SB 6

HANDLING & MANAGEMENT OF SURFACE TRAILING CABLES

1.0 IntroductionTrailing cables are utilised to supply a range of surface mining equipment including pontoon pumps, electric

drills, draglines, shovels, crib huts etc. Typical voltages for trailing cables range from 415V to 22kV. Vast

amounts of energy are carried within these cables.

High potential incidents involving trailing cables at surface mines that have occurred over the last twelve

months include:A 6.6kV trailing cable plug developed a short circuit and completely disintegrated. This occurred after

a rainstorm. Prior to this the shovel fed by the cable had walked and the plug was left lying on the

ground in a depression where rainwater pooled. While no one was injured potential existed for serious

injury had a person been in close proximity.

When a 6.6kV cable was being moved arcing from the side of the cable was noticed. Internal insulation

had failed and external arcing occurred due to a hole in the cable outer sheath at the site of a cable

repair. Protection equipment did not operate to trip the supply.

Machine operators attempted to uncouple live 6.6kV cables. They had mistaken an energised cable for

one which had been previously isolated. Protection equipment operated to trip the supply; no one was

injured.

A trailing cable was damaged during relocation with a rubber-tyre dozer. The energised cable had

excessive mechanical strain placed upon it by the machine. Protection relays operated to de-energise

the cable supply.

A 6.6kV trailing cable was pulled from its restraining plug as the cable was towed behind a cable boat

by a dozer during a dragline relocation. Undue strain had been placed on the plug - no-one was injured.

Reports have been made to the DME of persons driving light vehicles and mobile equipment over the

top of cables.

A study of incidents reveals that the group of persons most at risk of injury from trailing cables are machine

operators as they have the highest exposure to them while they are energised.

This discussion will be limited to handling, management and general operation of the cables. It seeks to raise

awareness of the potential hazards associated with trailing cables at surface mines, principally high voltage

cables, and highlight areas where attention may be required to ensure the risks are acceptable.

2.0 Potential Hazards

Potential hazards associated with surface trailing cables include:

Uncontrolled release of energy - open arcing caused by insulation failure, explosion of equipment due

to pressure rise inside apparatus caused by insulation failure (plugs). Potential injuries include severe

burns, injuries resulting from being hit by projectiles and death. A 6.6kV dragline cable could typically

Safety BulletinQueensland Department of Mines & Energy, Safety & Health Division,

Mines Inspectorate GPO Box 194, BRISBANE Q 4001

Ph 07 3237 1622 Fax 07 3237 1242


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contain enough energy to light 112,000 40W light bulbs. The pictures below depict a bolted 3-phase

short circuit simulated inside a trailing cable plug and facial burns received from an energy release

incident involving high voltage trailing cables.

Indirect contact of a person with electricity - a person receives an electric shock not because they touch

a live conductor, but because they touch a part that has become energised under fault conditions. Anexample of this would be a person receives an electric shock after they touch the outer sheath of a

cable. The shock was received because of leakage current to the outer sheath due to insulation failure.

Potential injuries include electric shock, burns and death.

Direct contact of a person with electricity - a person touches an energised conductor in the cable. An

example of this would be a person coming into contact with the receptacles inside an energised plug or

touching a conductor inside the cable after it has been damaged. The photographs below depict burn

injuries sustained after direct contact was made with power conductors in a high voltage trailing cable.

Potential injuries include electric shock, burns and death.

Fire - the cable catches fire after a fault on the cable. Other equipment or the surrounding environment

subsequently catches fire.

Internal Energy Sources - biomechanical energy; ie. excessive forces placed on the body through

manual tasks. Potential injuries include sprains strains and permanent disablement.

3.0 Potential Risks

While the photographs above are graphic, given normal operating conditions, the risks posed to a person by an

energised trailing cable are low, however if the balance is shifted through:

Inappropriate work practice;


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Poor maintenance and repair standards;

Inappropriate selection for use; or

Inappropriate operational standards and practice.

- Then the risks may become unacceptable!

Injury, equipment damage or near hits may result, results depicted in the photographs may occur.

Any incidents, damage or injury are all indicators that the risks are not being managedas they should!

4.0 Typical Surface Trailing Cable Construction

The diagrams below depict a typical high voltage trailing cable used to supply a dragline or shovel.

The design of the cable is such that an earth barrier is placed between the conductors. This is to ensure

that under fault conditions an earth fault will occur first thus ensuring the potential amount of energy

released is reduced compared to a power conductor to power conductor fault (phase to phase). There is

about 10mm distance between the outside of the sheath and the power conductor in a 120mm-sq. cable.

Major components of the cable and their function are as follows:

Power Conductor Copper stranded and bundled conductors that deliver the energy to where it isrequired to be used. In a 120-mm sq. conductor they would be 15.6mm in diameter.

Power Conductor Insulation A rubber type insulating compound designed to contain the voltage to

the confines of the power conductor.

Cradle Separator A cradle that carries the pilot wire at its center. The cradle holds the power

conductors in their desired form and constitutes the basis of forming the cable during manufacture.

Earth Metallic Screens These screens completely surround each power conductor and are intended to

carry fault current. They constitute the cable earth.

Pilot Wire a small conductor at the very center of the cable intended to be used in conjunction with

protection relays to detect cable breakage during operation or prior to operation. The relay used willcause power to be de-energised in the event of cable breakage or plug separation while the cable is

powered, or prevent power up if plugs are separated or the cable is broken (pilot wire broken).

Sheath a tough durable, hard wearing material designed to separate the power conductors from the

external environment and allow the cable to operate and withstand physical and environmental

conditions, which it was designed to endure.

Semi-conductive tape is used to separate the power conductors from the insulation and the insulation

from the earth screens in cables with a higher voltage rating than 3.3kV. In cables with a lower voltage

rating different materials are used for these barriers.


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Metallic ScreenMetallic Screen


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10 mm

Outer Sheath(Insulation)

Conductor Screen

(Copper)

Inner Sheath (Insulation)

Conductor Insulation (About 4mm)

Strengethening

Mesh (Plastic)

Cable

Conductor

Conductive Rubber

Pilot Cradle

Pilot Conductor

& Pilot Insulation

Typical Surface Trailing Cable Construction

(Type 409, 6.6kV, 120 sq. mm Conductors 100mm Diameter)

5.0 Typical Sources of Cable Damage

Typical sources of cable damage include:

Machinery Damage - Machinery driving over cables including dozers, graders, light vehicles and

equipment being towed across cables e.g. Lighting plants;

Machinery Damage - Machinery striking cables, e.g. Grader blades, trucks striking cables with theirbodies up as they cross beneath bridges;

Machinery Damage Draglines set shoes down on cable, draglines/drills/shovels propel over cable;

Falling Rocks Strike and Damage Cable - Rocks from spoil piles, Falling rocks from buckets beingswung over cables;

Excessive Mechanical Strain Too much cable attempted to be pulled in one drag, cables get caught

on objects such as rocks and tear;

Exceeding Minimum Bending Radius - Cables are only designed to be bent so far (check

manufacturers guidelines for specifics);


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Wear Damage to Plugs Wear to plugs and cable chaffing from being towed;

Water Ingress into Plugs - Resulting from damaged plug seals or plugs left on the ground;

Cables Used as Scrapers - When they are being towed rocks and dirt collect at the bottom radius bends;

Poor Repair Standards Repairs fail under service conditions; and

Cable Sheaths Torn/Punctured Cable sheaths are torn and punctured by sharp objects such as rocks

and dragline tub hooks, pin holes from sharp rocks allowing water and dirt ingress.

6.0 Recommendations

6.1 Every surface mine where trailing cables are in use should develop, implement and maintain a Trailing

Cable Management System addressing the following as a minimum:

Defined selection criteria addressing the application and the intended use for trailing cables;

Defined standards for the operation of trailing cables including:

a) Regular inspection including in-situ visual inspection by machine operators;

b) Regular testing of cables and maintenance of test records, definition of cable life cycles for each

cable application and definition of measures to monitor and measure the life cycle criteria;

c) Route criteria including support measures where applicable, methods and heights for crossings,

identification measures for cables, location of cables in proximity to roadways, protection measures

required where it is necessary to swing over the top of cables, vehicle crossings etc.;

d) Methods for relocation of cables and provision of adequate equipment to perform the task, e.g.

cable reelers, relocators;

e) Assurance that repairs are performed to appropriate standards and reliable recording of a repair

history for each cable is maintained;

f) Temporary repair measures and circumstances under which they can be applied are defined;

g) Methods for manual handling are defined and provision of adequate mechanical lifting aids is

made to eliminate manual handling sprains and strains. Equipment to separate and join plugs

should be sought. Note that a 1m length of 11/11kV Type 409 cable weighs approximately 15kg;

h) Regular inspection and preventive maintenance is performed on cable accessories such as reeling

devices;

i) Regular inspection, maintenance and testing is performed on substation earth systems including

earth mats, earth impedance and earth connection points, protection relays and trip batteries;

j) Provision of unique clear identifiers for each cable and trailing cable plug and substation outlet;

k) Defined standards for the circumstances under which trailing cable protection relays can be resetand power re-energised onto a cable where the relay has indicated a fault to be present;

l) Specific regulatory requirements are met;

m) Inspection and test procedures for equipment including earths and connections, earth

impedance, cables, substations and protection equipment after equipment relocation; and

n) Review and audit of the system.

Systems of high voltage switching, access and authorisation are developed, implemented monitored

and reviewed including the development and maintenance of statutory plans.


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Direct handling of energised cables is minimised. All persons should wear insulating gloves covered by

a leather outer when required to directly handle energised trailing cables.

Repair and testing of trailing by competent persons to AS 1747. While AS 1747 is principally a

standard for underground coal mining cables, there is no specific standard for surface cables. This

standard does describe appropriate techniques for repair and testing of surface cables. It is likely that

this standard will be revised in the future to include a separate section for repair and testing of surface

trailing cables.

Training must be provided where appropriate in the above and in trailing cable hazard awareness for all

persons required to work with them or on them. Workers associated with relevant tasks must be consulted in

relation to the development of the systems and standards mentioned above.

Rutherford Cableshave kindly provided and allowed the use of the above photographs. They have developed

a Cable Hazard Awareness Training Program, which can be delivered at site. Contact Rutherfords or your

local cable repairer or manufacturer for details on any training packages that may be available.

References:

AS 1747 - Reeling, trailing and feeder cables used for mining Repair and testing

AS 2802 - Electric cables - Reeling and trailing For mining and general use (other than underground coal

mining)

Peter Minahan

Chief Inspector of MinesSB 6, Date 19/04/2000, Contact: Robert Lewis, Inspector of Mines, 3222 2449


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Virginia Department of Mines, Minerals & Energy

Division of Mines

Accident Investigation Report

Underground Coal Mine

Electrocution Fatality

January 21, 2003

Dorchester Enterprises, Inc.Mine No. 4

Mine Index No. 14698AA

Wise County, Virginia

CONTENTS

Photographs/Sketches . . . . . . . . . . .. . . .. . . 1-4 Conclusion . . . . . . . . . . . . . . . . . . 12Commentary. . . . . . . . . . . . . . . . . . . . . . . . . 5-7 Enforcement Action . . . . . . . . . . . 13-14Statements From Mine Personnel . . . . . . . . 7-9 Recommendations . . . . . . . . . . . . 15

Physical Factors. . . . . . . . . . . . . . . . . . . . . . 9-12 Appendix . . . . . . . . . . . . . . . . . . . 16


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Fatal Accident Scene

Dorchester Enterprises, Inc.

Mine No. 4

M.I. No. 14698AA

Standing

WaterRoof Bolting

Machine CableCoal/Water

Slurry

Steel beam with end cut -

found lying approx. 6

from cable

Victim lying across

beam head on

right side of beam

End of steel beam that had been cut with oxygen/acetylene torches end of beam wasobserved lying approx. 6 from the damaged location on the roof bolting machine cable.


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Fatal Accident Scene

Dorchester Enterprises, Inc.

Mine No. 4

M.I. No. 14698AA

Damaged Cable Insulation Roof Bolting Machine Cable

Damaged cable insulation

area cut open for inspection

Roof bolting

machine cable

Damaged power

conductor insulation


48/84

SS # 117

Oxygen /Acetylene

Tanks

Oxygen/Acetylene Hoses

Heintzmann Beams

100 Ton Jackleg

Alternative Crib

Support

Trailer

(Front End)

Diesel Tractor

100 Ton Jackleg

(Horizontal)

Pump

Roof Bolting

Machine Cable

Coal Drill Cable

Continuous Mining

Machine Cable

Pump Cable

Sledgehammer

Shovel

Cut Heintzmann Beam

End of Cut Heintzmann Beam

Water line

0' 10'

Coil of Chain

Cutting Torch

Jackie Austin

Victim

FATAL DorcheMine NMine InJanuaryScale: 1" = 10'

SS # 120

#


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Jackie Austin

(Victim)

Cut Heintzmann

Beam

End of Cut

Heintzmann Beam

Roof BoltingMachine Cable

Trailer

(Front End)

0' 3.5'

100 Ton

Jackleg

Scale: 1" = 3.5'

AlternativeCrib Support

SS # 120

FATAL ACCIDENT SCENEDorchester Enterprises, Inc.Mine No. 4

Mine Index No. 14698AAJanuary 21, 2003


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ELECTROCUTION FATALITY INVESTIGATION REPORT

DORCHESTER ENTERPRISES, INC.

MINE NO. 4

MINE INDEX NO. 14698AA

On Tuesday, January 21, 2003, at approximately 1:55 p.m., an underground electrical

power accident occurred at Dorchester Enterprises, Inc., Mine No. 4, Mine Index No. 14698AA.

Jackie Lee Austin, general laborer, employed by The New Classic Company, Inc., was fatallyinjured when he apparently came in contact with a metal trailer and/or steel beams that had most

likely become energized from a damaged 440 volt alternating current (AC) roof bolting machine

trailing cable. Mr. Austin was transported to the surface and on to Wellmont Lonesome Pine

Hospital in Big Stone Gap, VA, where he was pronounced dead at 2:51 p.m. by Dr. KennethSlater, emergency room phyisican. The State Medical Examiners report of autopsy indicated

low voltage electrocution as the cause of death. Mr. Austin was assisting coworkers installing

Heintzmann steel beams as supplementary roof supports on the 001 Section. Mr. Austin, age 33,

had two years total mining experience, with one year employment for The New ClassicCompany, Inc. The Department of Mines, Minerals and Energys Division of Mines was

notified of the accident at approximately 2:30 p.m. on January 21, 2003, and a joint investigationwith the Federal Mine Safety and Health Administration was initiated the same day. The mine is

scheduled to receive two regular inspections every six months. The last regular inspection had

been completed on December 18, 2002.

COMMENTARY

Dorchester Enterprises, Inc., Mine No. 4, is located near Stonega, off State Route 78

North, in Wise County, Virginia. This underground mine is a one-section drift mine developed

approximately 1,850 feet in the Imboden coal seam. Approximately 1,200 tons of raw coal areproduced daily using continuous mining methods. Mining personnel produce coal on the first

and third shifts with maintenance work performed on the second shift.

The New Classic Company, Inc., is an independent contracting company employed byCumberland Resources Corporation to perform both underground and surface work at their

mining operations located in Virginia and Kentucky. Dorchester Enterprises, Inc., Mine No. 4, is

a subsidiary of Cumberland Resources Corporation. Mr. Austin and four other constructiongeneral laborers, employed by The New Classic Company, Inc., were performing underground

work when the accident occurred.

On Tuesday, January 21, 2003, eleven mining personnel employed by Dorchester

Enterprises, Inc., Mine No. 4, supervised by Mr. Michael Bowman, section mine foreman,

arrived on the 001 section at approximately 7:30 a.m. to produce coal. The area where coal wasbeing produced was located inby from where the accident occurred. Coal production proceeded

normally during the shift until the accident occurred involving Mr. Austin. The construction

general laborers entered the mine at approximately 7:15 a.m. under the direction of Mr. John

Stewart, Jr., Contractor Supervisor. Mine management personnel had directed Mr. Stewart and


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his employees to install Heintzmann steel beams as supplemental roof supports in the No. 5

entry, near survey station number 120, at areas identified by mine management personnel. These

beams were transported on a four-wheel, rubber tire, metal trailer pulled by an A.L. Lee, MiniTrac II, diesel powered tractor. The beam installation process involved placing the beams

against the mine roof with steel jacks installed underneath each end of the beams. Some beams

were too long to be properly installed and were required to be cut with an oxygen/acetylenetorch.

At approximately 12:15 p.m., Mr. Gail Kiser, General Mine Manager, arrived at thelocation where the steel beams were being installed. Mr. Kiser and Mr. Stewart were evaluating

and discussing locations where additional roof supports would be installed. Mr. Stewart and the

construction general laborers consisting of Mr. Austin, Mr. John Osborne, Mr. Jason Johnson

and Mr. Samuel Sanders had installed five beams and were making preparations to install thesixth beam, at approximately 1:50 p.m.

The mine floor where the beams were being installed was wet, muddy and had standing

water ranging from zero to eight inches in depth throughout the work area. Mr. Osborne hadpreviously cut the metal legs to the proper length necessary to install the sixth beam. At this

time, seven beams were lying in the metal trailer. Mr. Austin, Mr. Osborne, Mr. Johnson andMr. Sanders positioned a beam diagonally across the top of the trailer with one end lying on the

mine floor in preparation for cutting to the proper length. Mr. Osborne raised the end of the

beam, supported it on one leg and cut approximately three feet off the beam and lowered this cut

end onto the mine floor. Mr. Austin and Mr. Osborne, with assistance from Mr. Johnson and Mr.Sanders, planned to lift and install the cut beam onto the metal legs. Mr. Osborne walked around

to the front of the trailer preparing to assist in lifting one end of the beam and expecting Mr.

Austin to lift the cut end of the beam. Mr. Johnson walked around to the front of the trailer andtouched a steel beam lying on the trailer a few seconds after the beam was cut and felt a

tingling sensation of electricity and jerked back. Mr. Austin was holding the cut-off section of

the beam that was later observed lying on the rear of the trailer during the investigation. Mr.Osborne walked to the front of the trailer and turned toward Mr. Sanders to ask for his assistance

in lifting the beam when he heard Mr. Austin, located at the rear of the trailer, grunt twice and

say Oh God. Then Mr. Osborne turned toward the rear of the trailer and saw Mr. Austin

falling forward, face down, across the ends of the six beams that were extending from the rear ofthe trailer. Mr. Osborne ran down the outby side of the trailer and across the beam that had been

cut to Mr. Austins location and touched him in an attempt to evaluate his condition. Mr.

Osborne stated that he received an electrical shock when he touched Mr. Austin and jerked back,breaking contact with Mr. Austin. Then, Mr. Osborne stated that he said boys, hes getting

electrocuted. Mr. Osborne touched Mr. Austin a second time and received a second electrical

shock. At this time, Mr. Kiser heard Mr. Osborne call for assistance and he ran by the front anddown the outby side of the trailer and across the beam that had been cut to Mr. Austins location.

Mr. Kiser, assisted by Mr. Osborne and Mr. Stewart, rolled Mr. Austin off the beams onto the

mine floor. Mr. Osborne said that he felt a tingle of electricity, while Mr. Kiser and Mr.Stewart said that they didnt feel any electricity as the three of them were rolling Mr. Austin off

the beams onto the mine floor. Mr. Stewart conducted a patient assessment and determined that

Mr. Austin was not breathing and had no pulse and he initiated cardiopulmonary resuscitation.

Realizing that personnel with advanced first aid knowledge and skills were needed, Mr. Kiser


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traveled to the 001 Section working places to summons Emergency Medical Technicians

(EMTs) and Advanced First Aid certified personnel. Mr. Bowman and Mr. David Aistrop,

certified as Emergency Medical Technician First Responders and Mr. Bobby Wise, certified inAdvanced First Aid, responded immediately to the accident scene and assisted Mr. Stewart and

other mine personnel in administering cardiopulmonary resuscitation. Mr. Kiser instructed Mr.

Sammy Stallard, electrical repairman, to go to the section mine telephone and to inform Mr.Frank Bowman, mine superintendent, located on the surface, of the accident and to request

rescue squad assistance.

Mining personnel and Mr. Austins coworkers continued cardiopulmonary resuscitation

while they stabilized him on a spineboard. Cardiopulmonary resuscitation was continued while

transporting Mr. Austin to the surface. Upon arrival on the surface, Appalachia Rescue Squad

personnel assumed control and transported Mr. Austin to the Wellmont Lonesome Pine Hospitalin Big Stone Gap, VA, where he was pronounced dead at 2:51 p.m. by Dr. Kenneth Slater,

emergency room physician.

STATEMENTS FROM MINE PERSONNEL AND OTHER FACTORS:

Statements from mine personnel and other factors determined during the investigation

revealed the following:

1. The accident occurred on January 21, 2003, at approximately 1:55 p.m. in the last opencrosscut between No. 4 and No. 5 entries, approximately 18 feet from survey station

number 120, located on the 001 Section.

2. Dorchester Enterprises, Inc., Mine No. 4, is a subsidiary of Cumberland Resources

Corporation.

3. The New Classic Company, Inc. is an independent company contracted by Cumberland

Resources Corporation to perform both underground and surface work at their mining

operations located in Virginia and Kentucky.

4. The New Classic Company, Inc. employees including Mr. Stewart, Contractor

Supervisor, and four construction general laborers had been instructed to install

Heintzmann steel beams as supplemental roof supports in the face area of No. 5 entrynear survey station number 120 on the 001 Section.

5. There were no eyewitnesses to the accident; however, four other construction co-workers

and one Cumberland Resources Corporation employee were located in the generalvicinity when the accident occurred.

6. Mr. Stewart and the construction general laborers had installed five steel beams and hadprepared the sixth beam for installation when the accident occurred.

7. The construction general laborers positioned the sixth beam diagonally across the top of

the metal trailer with one end lying on the mine floor. Mr. Austin and coworkers were


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in direct contact with the beams and trailer while positioning the beam for cutting and

none of them felt any sensation of electricity. Mr. Osborne stated that he cut three feet

off the beam approximately 30 seconds before the accident occurred.

8. Mr. Osborne stated that after cutting the beam he walked to the front of the trailer to

position himself to help lift one end of the beam into position for installation. Mr.Austin planned to lift the cut end of the beam.

9. Mr. Johnson stated that he walked around to the front of the trailer and touched a steelbeam lying on the trailer a few seconds after the beam was cut, but before the accident

occurred, and felt a tingling sensation of electricity and jerked back.

10. Mr. Osborne stated that Mr. Austin was holding the three-foot beam section that hadbeen cut off and walked around to the rear of the trailer. During the investigation, this

piece was observed lying on the rear of the trailer. No eyewitnesses saw Mr. Austin

place the cut off section of steel beam on the trailer.

11. Mr. Osborne stated that he turned toward Mr. Sanders to ask for help in lifting the beam

when he heard Mr. Austin, located at the rear of the trailer, grunt twice and say OhGod. At this time, Mr. Osborne ran to Mr. Austins location and touched him in an

attempt to evaluate his condition. Mr. Osborne stated that he felt an electrical shock

when he touched Mr. Austin. After feeling an electrical shock, Mr. Osborne broke

contact with Mr. Austin. At this time, Mr. Osborne stated that he said boys, hesgetting electrocuted. Mr. Osborne stated that he touched Mr. Austin a second time and

received a second electrical shock and again broke contact.

12. Mr. Osborne and Mr. Kiser stated that they ran down the outby side of the trailer and

across the cut off end of the beam while traveling to Mr. Austins location when the

accident occurred.

13. Mr. Osborne stated that he felt a tingle of electricity while Mr. Stewart and Mr. Kiser

stated that they didnt feel any electricity as the three of them were rolling Mr. Austin off

the beams onto the mine floor. Mr. Stewart and Mr. Kiser stated that they were wearingrubber boots and Mr. Osborne stated that he was wearing leather boots and that his feet

were wet.

14. Mr. Kiser, Mr. Stewart and Mr. Osbornes recollection of the sequence of events

differed, in that each stated that he was the first person to touch Mr. Austin after the

accident.

15. Mr. Stewart stated that while assisting with cardiopulmonary resuscitation he observed a

trailing cable in the immediate area where Mr. Austin was being treated. Mr. Stewartalso observed the cut end of the beam lying over but not in direct contact with the

trailing cable. This trailing cable was later identified as the 480 volt, three phase,

alternating current power source for the section No. 1 roof bolting machine, and it was

determined during the investigation that the cable was energized when the accident


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occurred. Mine personnel also stated that they observed the cable underneath the beam

approximately six inches from where the beam contacted the mine floor.

16. Mr. Kiser, Mr. Stewart and others stated that they did not feel any electricity while

administering first aid and performing cardiopulmonary resuscitation on Mr. Austin.

17. Mr. Osborne stated that Mr. Austin was wearing leather boots and leather gloves with

cloth gloves inserted inside the leather gloves. Mr. Osborne also stated that Mr. Austin

had informed him, approximately 45 minutes before the accident occurred, that one ofhis boots was leaking and that one foot was wet.

PHYSICAL FACTORS

The investigation of physical factors revealed the following:

1. The electrical accident occurred in the No. 5 entry on the 001 section, approximately18 feet from survey station number 120.

2. The mining height was seven feet and the entry width was nineteen feet and six

inches where the accident occurred.

3. Coal/water slurry with some standing water, ranging from zero to eight inches indepth was present throughout the work area where the accident occurred.

4. A four wheel, rubber tire, metal trailer pulled by an A.L. Lee, Mini Trac II, dieselpowered tractor was used to transport the steel beams to the 001 Section and was

observed at the accident scene. The beams were 18 feet in length. The trailer is

sixteen feet and four inches in length and four feet and six inches in width and isequipped with side rails that result in a total trailer height of 28 inches. Beams and

jacks were observed lying on the trailer.

5. A section of steel beam, approximately three feet in length, identified as the piecethat Mr. Austin was holding, was observed lying on the rear of the trailer.

6. Oxygen/acetylene tanks that were used to cut the steel beam were observed leaningagainst the inby rib near the trailer. The torches were observed lying in the trailer.

7. The beam that had been cut was observed lying partially on the trailer with the cutend lying against the mine floor in close proximity to but not touching the 480 volt,

three phase, alternating current, No. 1 roof bolting machine trailing cable that was

energized when the accident occurred. The cut end of the beam had a jagged edgewith protruding slag that resulted from the cutting process. This cut end of the beam

had been hot when placed on the mine floor in the immediate vicinity where the

energized No. 1 roof bolting machine trailing cable was located.


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8. The walkway clearance between the trailer and outby rib was limited due to the cut

beam, installed jacks, section equipment trailing cables, waterline and a rock. Mr.

Osborne and Mr. Kiser traveled through this partially obstructed area while enrouteto Mr. Austins location after the accident occurred.

9. The No. 1 roof bolting machine was located in the No. 4 entry inby the area wherethe accident occurred. A Number 2 American Wire Gauge (AWG), two kilovolt

(KV) cable provided 480 volts alternating current (AC) to the machine and was

routed through the last open crosscut between the No. 4 and No. 5 entries and downNo. 5 entry to the section power center. This energized cable was observed at the

rear of the trailer underneath the beam approximately six inches from where the

beam contacted the mine floor. The top of the cable was barely visible in the area

where the cut end of the beam contacted the mine floor due to accumulations of loosecoal and water.

10. A damaged place on the energized 480-volt, No. 1 roof bolting machine trailing

cable was observed in close proximity to but not touching the end of the beam thathad been cut. The outer insulation of the trailing cable had been ruptured and

physical damage had exposed the red phase conductor inside the cable. Thedamaged place on the cable was the most likely source of electricity that could have

energized the metal trailer and beams.

11. On January 22, 2003, all circuit breakers, including the No. 1 roof bolting machinebreaker located on the Line Power, 001 Section transformer, were examined and

tested by grounding each phase supplied to each circuit breaker. All circuit breakers

and ground check monitoring circuits operated properly. No circuit breakers tripped(de-energized) when the accident occurred indicating that none of the circuit breakers

sensed a ground fault condition that would cause the breakers to trip (de-energize).

A ground fault condition on the No. 1 roof bolting machine trailing cable could haveexisted during the accident and allowed sufficient current flow to cause the

electrocution, but sufficient current was not available to activate the protective

devices, thereby de-energizing the bolting machine circuit breaker.

12. All trailing cables providing power to section mining equipment were tested for both

grounded phase and phase-to-phase conditions and no deficiencies were observed.

All trailing cable couplers were examined and tested for proper grounding and nodeficiencies were observed.

13. One circuit breaker located on the section power center provided power to adistribution box that was the power source for three underground pump circuits. The

circuit breakers and ground check monitoring devices provided for the three pump

circuits were examined and tested and all circuits operated properly.

14. The following observations, examinations and tests were conducted on the No. 1 roof

bolting machine trailing cable:


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The cable was observed lying underneath but not in direct contact with thecut end of the beam;

The beam was moved and placed on the trailer to gain access to thoroughlyexamine the cable in the immediate area where the cut end of the beam wasobserved during the investigation;

The cable was lifted off the mine floor and secured to the mine roof withnylon ropes;

A metal water clamp was placed around the cable approximately four feetfrom the area where the cut end of the beam crossed over the cable. The

clamp was utilized to measure any potential voltage within the circumference

of the cable;

A Simpson 260 voltohm meter was utilized to measure any potential voltageby attaching one test lead to the metal water clamp and by placing the other

test lead against the mine floor (earth);

The volt-ohm meter was positioned on the alternating current (AC) functionand the 50 volts range selector scale. A measurement of 50 volts was

detected on the trailing cable outer jacket approximately two feet from thelocation where the cut end of the beam crossed over top of the energized

trailing cable. A maximum of 50 volts can be detected with the meter set onthe 50 volts range selector scale;

The volt-ohm meter was then positioned on the alternating current (AC)function and the 250 volts range selector scale. A measurement of 250 volts

was detected on the trailing cable outer jacket in the immediate area wherethe cut end of the beam crossed over top of the energized trailing cable;

A small damaged place on the outer jacket of the trailing cable was identifiedas a result of 250 volts alternating current measured at this location;

The trailing cable was cut open at the damaged location for further

examination which revealed the extent of the damage extended from theoutside to the inside of the cable jacket;

A section of the trailing cable outer jacket was removed at the damaged placeto evaluate the condition of the three phase power conductors. This

examination revealed damage to the insulation provided for the red phasepower conductor which had destroyed a small segment of insulation,

exposing the phase conductor;

Damage to the trailing cables outer jacket and the red phase power conductorprovided the electrical source from which 250 volts alternating current was

measured on the outer jacket with the volt-ohm meter.

A section of roof bolting machine trailing cable containing the damaged place

was sent to the Federal Mine Safety and Health Administrations Approvaland Certification Center located in Triadelphia, West Virginia, for testing.

Mr. David Creamer, Chemist of the Materials and Explosions Testing

Branch, examined and tested the section of damaged cable. Mr. Creamer

concluded that the red phase power conductor insulation had been damagedby an external heat source.


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CONCLUSION

On January 21, 2003, at approximately 1:55 p.m., an underground electrical poweraccident occurred at Dorchester Enterprises, Inc., Mine No. 4. Jackie Lee Austin, general

laborer, employed by The New Classic Company, Inc., collapsed while performing underground

construction work and was later pronounced dead at the Wellmont Lonesome Pine Hospital. TheState Medical Examiners report of autopsy indicated low voltage electrocution as the cause of

death. Mr. Austin was fatally injured when he came in contact with a metal trailer and/or steel

beams that had most likely become energized from a damaged 440 volt alternating current, roofbolting machine trailing cable. The Investigation Team considered the following in concluding

that an electrocution occurred:! The trailer used to transport the steel beams was moved into the area approximately two

hours before the accident occurred. Mr. Austin and coworkers were in direct contactwith the beams and trailer while positioning the beam for cutting immediately before the

accident and none of them felt any electrical shock. The accident occurred at 1:55 p.m.,

approximately 30 to 60 seconds after the steel beam was cut. A direct relationship

between cutting the beam, placing the cut end of the beam on the mine floor and theaccident appears to exist. Mr. Johnson felt a sensation of electricity on the metal

trailer/beams immediately after the beam was cut but a few seconds before the accidentoccurred. One event occurred that energized the trailer frame and a separate event

occurred that removed the electrical energy from the trailer. The event that disrupted the

flow of electricity from the trailer frame was most likely due to unintentional movement

of the beam and/or cable after the accident occurred.! A source of electricity was verified in the immediate area where the accident occurred

that could have energized the metal trailer and beams providing sufficient voltage and

current to have caused electrocution.! The mine floor where the accident occurred was wet, muddy and had standing water

ranging from zero to eight inches in depth throughout the work area.! The State Medical Examiners report of toxicological analysis did not indicate any

abnormalities that contributed to Mr. Austins death.

! Mr. Austin was wearing leather boots and he had informed Mr. Osborne that one boot

was leaking and that one foot was wet approximately 45 minutes before the accident

occurred. A wet, leather boot could have provided a low resistance path to groundpotential for electricity to flow through Mr. Austin. Mr. Austin was wearing leather

gloves with cloth gloves inserted inside the leather gloves.


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ENFORCEMENT ACTION

The following enforcement action with Dorchester Enterprises, Inc., Mine No. 4, was

taken as a result of the investigation:

1. An order of closure, No. FXL0002695, was issued under section 45.1-

161.91.A.(ii) of the Coal Mine Safety Laws of Virginia to control and preservethe scene of the accident pending the investigation. The order of closure was

modified to allow power circuits to be energized and normal mining operations to

resume.

2. * A notice of violation, number FXL0002707, was issued under section 45.1-

161.206 of the Coal Mine Safety Laws of Virginia. The investigation of the death

of a miner was conducted by the Department of Mines, Minerals and Energy and

the Federal Mine Safety and Health Administration on January 21 and 22, 2003,at Dorchester Enterprises, Inc., Mine No. 4. Mining personnel and/or independent

contractor personnel stated in investigation interviews conducted on January 22,2003, that an A.L. Lee, Mini-Trac II, non-permissible unit of diesel equipment,

serial No. 01-1402, had been operated in the last row of open crosscuts between

the No. 4 and No. 5 entries on the 001 section on January 21, 2003. This

violation did not contribute to the fatal accident.

3. * A notice of violation, number FXL0002709, was issued under Section 45.1-161.207.B. of the Coal Mine Safety Laws of Virginia. The investigation of the

death of a miner was conducted by the Department of Mines, Minerals and

Energy and the Federal Mine Safety and Health Administration on January 21 and22, 2003, at Dorchester Enterprises, Inc., Mine No. 4. Mining personnel and/or

independent contractor personnel stated in investigation interviews conducted on

January 22, 2003, that a test for methane gas had not been conducted prior to

igniting oxygen/acetylene torches used to cut metal beams in the immediate areaof survey station number 120 on the 001 section on January 21, 2003. This

violation did not contribute to the fatal accident.

4. A notice of violation, number FXL 0002705, was issued under section 45.1-

161.194.F. of the Coal Mine Safety Laws of Virginia. The investigation of the

death of a miner was conducted by the Department of Mines, Minerals andEnergy and the Federal Mine Safety and Health Administration on January 21 and

22, 2003, at Dorchester Enterprises, Inc., Mine No. 4. The trailing cable

supplying power to the No. 1 Fletcher roof drill, Serial No. 20002-022, located onthe 001 section in the immediate area of survey station number 120, was not

protected against mechanical injury. On January 22, 2003, at approximately 9:35

a.m., a damaged place was detected in the trailing cables outer jacket and the

insulation provided for the red phase conductor. The damaged place observed on


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the trailing cable and the red phase conductor insulation was located in the

vicinity where the death of a miner had occurred on January 21, 2003, at

approximately 1:55 p.m. At the location where the trailing cable was damaged, aDepartment of Mines, Minerals and Energy Technical Specialist/Electrical

(certified electrical repairman), using a Simpson 260 volt-ohm meter, measured

250 volts alternating current between the outer jacket of the cable and the earth.

* Also issued to The New Classic Company, Inc.


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RECOMMENDATIONS:

1. Recognize the potential hazards created when work activities are being conductedaround electrical cables.

2. Trailing cables shall be protected against mechanical injury by hanging to the mineroof or by location to prevent damage from equipment or other work being performed

in the affected area.

3. Miners should immediately de-energize power to any equipment or cable when stray

electrical current is detected. This hazardous condition should be reported to the

foreman and electrical repairman immediately.

4. Miners should wear rubber gloves when handling any type of energized low and

medium voltage cables. Rubber boots provide additional protection and should be

worn when practical.

5. The foreman and repairman should ensure that reports of damaged cables are checked

and corrected immediately.


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SIGNATURE SHEET

This report hereby submitted by Forrest Lambert, Jr. and approved by Frank A. Linkous:

________________________________________________________________________FORREST LAMBERT, JR., COAL MINE INSPECTOR Date

________________________________________________________________________

FRANK A. LINKOUS, CHIEF Date


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APPENDIX

VICTIM DATA SHEET

PERSONS PRESENT DURING THE INVESTIGATION

MINE LICENSE INFORMATION


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VICTIM DATA SHEET

Name: Jackie Lee AustinOccupation: General Laborer

Mailing Address: P. O. Box 1047, Castlewood, VA 24224

Date of Birth: February 7, 1969Total Mining

Experience: Two years

Experience with Present Company: One yearExperience in Present Occupation: One year


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PERSONNEL

The following personnel provided information and/or were present during the

investigation:

Dorchester Enterprises, Inc., Mine No. 4

Frank Bowman Mine Superintendent

Michael Bowman Section Mine ForemanBobby Wise, Jr. Continuous Mining Machine Operator

Sammy Stallard Electrical Repairman

David Aistrop Shuttle Car Operator

Jeffrey Whisman Chief Electrician

The New Classic Company, Inc.

John Brady Stewart, Jr. Contractor Construction Supervisor

John Thomas Osborne General LaborerJason Scott Johnson General Laborer

Samuel Cleo Sanders General Laborer

Cumberland Resources Corporation

Gail Kiser General Mine ManagerThomas Asbury Safety Director

Cumberland Resources - Electrical Consultant

Hershel Bull

Federal Mine Safety and Health Administration

Benjamin S. Harding Supervisory, Coal Mine Safety & Health Specialist,

Ventilation

Russell A. Dresch Electrical EngineerArnold D. Carico Mining Engineer

Larry Meade, Jr. Coal Mine Safety and Health Inspector

David Creamer Chemist, Materials and Explosions Testing BranchApproval and Certification Center


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Virginia Department of Mines, Minerals and Energy

Division of Mines

John Thomas Mine Inspector Supervisor

Robert Garrett Coal Mine Technical Specialist - Electrical

Forrest Lambert, Jr. Coal Mine InspectorDaniel Perkins Coal Mine Technical Specialist


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Mine License Information

Official Corporation: Dorchester Enterprises, Inc.

Official Business Name of Operator: Dorchester Enterprises, Inc.

Person With Overall Responsibility: Gail KiserPerson in Charge of Health and Safety: Gail Kiser


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AUSPROOF


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Detalles de la Compaa

ABN: 17 062 940 023

Direccin: Lot 2 Callemondah Drive

Gladstone Queensland

Australia 4680

Direccin Postal: P.O. Box 1831

Gladstone DC

Australia 4680

Telefono: +61 7 49784000

Fax: +61 7 49785685

Contactos principales: Philip MarksDiseo & Produccin

[email protected]

Frank Lantry

Ventas & Mercadeo

[email protected]

Wendy Marks

manipulacion de cables - compendio

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