The one thing I thought I knew and was comfortable with was the NEC. I might still contend that, but wonder what you all think.
If you have the Kaplan Sample exam see problems 1.22-1.26, or more specifically the solutions. If you don’t have it, in brief, a building service has computed load is 645 Amps (120/208 3 phase 4 wire).
1.22 - What size THHN Aluminum conductor is required if they are paralleled six times per phase?
Also OPD, Size of Neutral, Conduit If IMC, and the Grounding Electrode Conductor. Since 3 of the questions are directly related to that answer *I* only got 2 out of 5
Good problem, their procedures and methods are sound but answers… not so much imho. Their answer for 1.22 is #1 AWG. They go as far as quoting the code section for parallel conductors, perhaps didn’t read it. Among other things says you cannot parallel anything less than 1/0AWG (there are exceptions but none applicable to this problem).
I hope the NCEES has more conscientious authors.
John
If you have the Kaplan Sample exam see problems 1.22-1.26, or more specifically the solutions. If you don’t have it, in brief, a building service has computed load is 645 Amps (120/208 3 phase 4 wire).
1.22 - What size THHN Aluminum conductor is required if they are paralleled six times per phase?
Also OPD, Size of Neutral, Conduit If IMC, and the Grounding Electrode Conductor. Since 3 of the questions are directly related to that answer *I* only got 2 out of 5
Good problem, their procedures and methods are sound but answers… not so much imho. Their answer for 1.22 is #1 AWG. They go as far as quoting the code section for parallel conductors, perhaps didn’t read it. Among other things says you cannot parallel anything less than 1/0AWG (there are exceptions but none applicable to this problem).
I hope the NCEES has more conscientious authors.
John