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feeder ampacity
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  1. General Electrical Discussion
    I have a question that I'm not really sure I know the correct answer to. If you have dwelling unit calculation that comes out to, say 195 amps, can you still use 4/O aluminum? In 230.42 it states that the conductor shall have an ampacity not less than the maximum load to be served, but in...
  2. Services and Service Equipment
    I’ am currently bidding a job for a a triplex. Each of the 3 units will have its own 100 Amp panel, and the House panel will be a 50 amp. I am considering bringing in a 400 amp feed, is that over kill or is that the correct service size i should be using for this project?
  3. NEC Code Forum
    I can't find anywhere in the NEC that says the amperage rating for a sub-panel must meet or exceed that of the wire feeding it. By 408.36, it appears that I will be compliant as long as the supply side breaker rating is smaller than or equal to ampacity of the wire and smaller than or equal to...
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