Peter Willy Johnson
Member
- Location
- Bakersfield, CA
A customer asked us to temporarily refeed a 3 phase 480 volt lighting ups that was fed from a lighting distribution panel. It was originally fed with a 3 ph 4 wire circuit from the lighting distribution panel which was fed from a main switch board in a different electric room. There was a fault in one phase of the feeders to the LDP so they wanted a temporary so cord feed from a different main switchboard fed from a different transformer. The problem was that the circuit they wanted to use didn't have a neutral available (it was out of a bucket in an MCC) so they said just use the neutral in the LDP. My first objection was to the fact that not all of the current carrying conductors would be in the same raceway. The neutrals are parallel runs in two separate conduits and the temporary feed would be SO cord to a bucket. Common sense says that it is probably not a good idea to connect a circuit from one transformer to the neutral of another. I was hoping you guys could give me some code sections that might back this up. Any help would be appreciated. Also any realistic ideas of what might happen if one were to do this? I get that this should work in theory but it just seemed like a bad idea.
