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Ralph Mowery

In article ,
says...

A friend of a friend was severely injured a couple of weeks ago by an
arc flash at a 480V breaker panel. Turning off high-energy circuits is
no joke.

I have seen the results of a 480 volt 3 phase 'blow up', Fellow at work
turned on a breaker that was only a 20 amp rating for a small motor.
Not sure what hapened, but it melted down a whole bank of about 30 or 40
cubicals in a load control center. That bank ws fed with around 400
amps from a larger breaker in what we called a substation room. It
meleted out the bus bars on that load control center.

When working I dealt with 480 V 3 phase equipment almost daily. Lots of
10 to 100 hp motors and some heaters that were fused at 250 amps.