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Voltage limitation on Underground Cables at Mine Sites?

Voltage limitation on Underground Cables at Mine Sites?

Voltage limitation on Underground Cables at Mine Sites?

(OP)
Pennsylvania Bureau of Deep Mine Safety has a voltage restriction on underground transmission at mines:
"Secondary or underground transmission voltage shall not exceed fifteen thousand volts, nominal, phase-to-phase. "
http://www.dep.state.pa.us/dep/deputate/minres/dms/website/approval/minepower.html

Does anyone know if the larger national governing bodies such as OSHA, MSHA, NEC and even CSA has a voltage limitation for transmitting power via underground cables at mines?

I did look through
CSA M421-00 Use of Electricity in Mines,
CSA C22 No 96.1-04 Mine power feeder cables
and OSHA and MSHA websites.

Didn't find anything particular on this subject underground transmission cables.

RE: Voltage limitation on Underground Cables at Mine Sites?

This should be covered in MSHA Chapter 57 Subpart K.  This available at http://www.msha.gov/30cfr/57.0-1.htm

I didn't see any voltage restrictions of the nature that you mentioned.

RE: Voltage limitation on Underground Cables at Mine Sites?

I too am unaware of any such regulation.  I did as you did majesus and looked through my copy of CSA M421-00 Use of Electricity in Mines - I found nothing.

I understand that there are many coal mines in that region - in that regard a limitation on voltage seems to make sense.  It seems to me that fifteen thousand volts, however, would be more than sufficient to ignite stray coal dust.

I did find the following document on the MSHA website, but it only very briefly discusses the amount of electricity needed for coal dust ignition.

http://www.msha.gov/S&HINFO/TECHRPT/FANDE/CDUSTEX.pdf

---
Cory Anderson
http://startco.ca/

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