Re: Electrical Safety

Posted by UAFitter on January 02, 2017 at 05:32:02 from (206.166.91.2):

In Reply to: Electrical Safety posted by Geo-TH,In on January 02, 2017 at 04:16:10:

I've seen a pile of good advice on this site, and taken advantage of lots of it, and am grateful for all of it. What you just posted is none of that. In fact, it's probably among the very, very worst advice I have ever seen, anywhere.

Deliberately shorting mains power to ground as a means of ensuring de-energization is right up there with driving into a telephone pole to verify your car is stopped. If you do this, you are putting yourself at risk of arc flash and electrocution every time you do it. Google "arc flash" or watch a YouTube video if you don't believe me.

Working safely around electricity is a matter of knowing what you are doing and following the right procedures every time. Your man at the hospital, if he exists and really was working on a rooftop, should have deenergized it at the unit disconnect, which by code has to be within 10' of the unit. If it was old enough to be grandfathered and not to have a unit disconnect within 10', he should have gotten the location of its disconnect from the facility's blueprints, which by law the hospital is required to have documented. Then, he should have used a meter to verify power before the disconnect, and no power after it, and then he should have checked at the connection block in the unit, both phase to phase and to ground. He should also have used his meter to verify that control power was de-energized, since it can sometimes be fed from a separate source and even low voltage can be unpleasant. If lightning really did fuse those contacts, which seems like patent BS to me (and I've worked on a bunch of lightning-struck rooftops), then the only thing that he would have accomplished by shorting primary power to ground with a screwdriver would have been to make himself a path to ground through his screwdriver, unprotected by the circuit breaker. Ten seconds of competent work with a meter would have saved him. Don't tell me about not trusting your meter, either. If you don't have a test instrument you trust, you should get one, and if you can't get one, you shouldn't be doing work on any circuit that might be live.

You want to work like that, go on ahead, I guess. Vigo County is still part of the land of the free. Do everyone else around you a favor and keep your bad ideas to yourself. The only lesson the "boy" should have learned is "don't do electrical work with George."

Replies:

• Re: Electrical Safety rrc300 u 05:54:45 01/02/17 (0)

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