In article ghvJe.9796$WQ.8625@trnddc03,
says...



There is a problem with 480 other than electric shock. 480 has the
ability to vaporize metals and spray it around. I have seen the results of
dropping things across 480 and I'm probably overly 'scared of it.


I'd never heard that before, but it explains why a short in
a 480 box tends to blow the cover off, while a 240 "event"
isn't usually nearly as exciting. Personally, I'm
respectful of 120, very cautious around 240, and just plain
skittish around 480. I have one customer that has a bunch
of 550 volt imported from Canada equipment that I did
control retrofits on that makes me feel much as you -
probably more nervous than I should be.

Ned Simmons