Home Improvement Asked by Kevin Sowell on December 8, 2020
i’ve got 120′ of 350/350/4/4 AL wire from transformer to a 400 amp service entrance meter/panel (Siemens MM0404L1400RLM). From there, the 200 amp feeder breaker is going to feed via 2 1/2″ conduit to the future house.
That run is 235′ to a temporary power panel to be used during construction ( Siemens PW0816B1200TC).
Is 4/0,4/0,2/0,#4 good? Or am I not allowed to down-size the neutral?
Your 350/350/4/4 AL for the 400A entrance cable from the meter seems undersized. even using the residential NEC 310.15 83% of 400 for 332A would require 500KCMIl for the hots and 300 KCMIL for the neutral using the 70% rule at 90C (if your utility allows that). Unless I missed your point and you are protecting this line with a 200A breaker from the 400Amp panel to feed the future house. (and then, your wire seems perfect!)
Answered by mark f on December 8, 2020
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