canoeman
Member
- Location
- United States los angeles california
I am on a job, where the electrician was given three conduits, to feed three paralell 750MCM aluminum, to a switch gear. the engineer, to save money, switched from two paralell feeds of 500mcm copper to three paralell 750 mcm. At the switch gear, they landed the three sets of three paralell phases in their own ilsco blocks, then to fit breaker, he ran two sets of 500 mcm into double lug breakers, that had max lug size of 500 mcm. Three phase, 480vac.
when the electrician got to the last vault, he put two sets of parallel feeds in one conduit, and one set in another, leaving the third conduit, and a spare empty.
Then when feeding out to sub panels, he ran two sets of paralell feeds in one conduit..
won't this cause heating and power quality problems. The engineer has made many bizarre directions to the electrical contractor, so I know this is already very unusual.
I feel the engineer is way over his head on these issues, this was his first big job.
We have three 600 amp switch gear panels, with thre sets of paralell feeders, and an 800 amp, 4 paralell aluminum 750MCM feeds coming up, with the same set up.
when the electrician got to the last vault, he put two sets of parallel feeds in one conduit, and one set in another, leaving the third conduit, and a spare empty.
Then when feeding out to sub panels, he ran two sets of paralell feeds in one conduit..
won't this cause heating and power quality problems. The engineer has made many bizarre directions to the electrical contractor, so I know this is already very unusual.
I feel the engineer is way over his head on these issues, this was his first big job.
We have three 600 amp switch gear panels, with thre sets of paralell feeders, and an 800 amp, 4 paralell aluminum 750MCM feeds coming up, with the same set up.