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#177597 05/08/08 09:11 AM
Joined: Mar 2003
Posts: 849
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By reading 70-E there not really covered by this even when working on HV switchgear am I right.

Arc Flash PPE Clothing, LOTO & Insulated Tools
Joined: Jul 2007
Posts: 1,335
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I am not sure what you mean by you post. 70E is just a standand that was written to "clearify" OSHA requirements. 70E is applicable if adapted by your employer.

In other news, Something I have been wanting to ask you. Going by your user name, where abouts in the U.P. are you Located? I was born and raised as a "Troll". (Michigan humor).


"Live Awesome!" - Kevin Carosa
Joined: Mar 2003
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I forgot to put before the Post Utility Companys.
North of the bridge about 200 miles.

Joined: Sep 2005
Posts: 120
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Utilities follow NESC, they have been able to dodge 70E for while now but are in the process of adapting many of the 70E rules. They also follow 1910.269 which has many of the same SWP's.

The only thing the 70E brings is the are flash calcs and PPE requirements. The tables only apply up to 38kV and the calcs dont work either, so really they ARE following the 70E, at least the parts that apply.

As far as PPE, linemen have been wearing arc resistant materials for years, but in the substations (Indoor, metal clad switchgear) the current rules the utilities follow are not good enough to protect workers, this is where they SHOULD be following 70E and this is where most of the upcoming NESC changes will apply.

The thing is, an arc flash at 72kV in open air is nothing compared to one at 480V in a cubic box with high available fault currents and a lonfg clearing time like what is found on nearly every 480V substation out there.

I hope I answered your question, if not, please ask a more specific question.


MV/HV Testing Specialist, "BKRMAN"

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