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Wednesday, January 31, 2018
Question:
Re: CQD answer published Wednesday, January 16, 2018 -
Charlie, I don't agree with your answer on the 200A, 600 foot run. The voltage drop will be 9.6 volts (8%) at full load. I think it's high time the NEC address voltage drop as a requirement vs. a 'suggestion' (or whatever an 'informational note' is). If this were my job, I'd run parallel 4/0 aluminum or 4/0 copper.
Dave Rutkowski
A
Answer:
Hey Dave thanks for your comment, you have a good point that would be a much better design but at this time voltage drop limits are not a requirement for all feeders. Informational Note No. 2 to 215.2(A)(1) indicates that 3 % for feeders and 5% for the total will provide a reasonable efficiency of operation. Energy codes and manufacturer's instructions can also have requirements.