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Thread: How to design a system that has 3 electrical boxes over an 850 ft. distance

  1. #1
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    May 2019
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    Parker, Colorado. Douglas County
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    How to design a system that has 3 electrical boxes over an 850 ft. distance

    I want to run wire from my electrical pedestal so I can have power for electrical equipment at 350 feet, 535 feet and 820 feet. My calculations are that I can run aluminum 4/0 AWG (212 kcmil) the entire distance and have 100 AMP breaker at the 1st panel at 350 ft., 75 AMP breaker at the 2nd panel at 353 ft. and a 50 AMP breaker at 820 ft. The county inspector says I can not do that and have to use 40 AMP breakers at each location. The voltage drop will not exceed 7% when I have the breakers placed for the given distance. Am I wrong and if not what should I tell the inspector so I can maximize my project?

  2. #2
    Join Date
    Feb 2003
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    Seattle, WA
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    I am closing this thread in accordance with forum rules. This forum is intended for use by electricians and electrical contractors, inspectors, engineers, and vendors with their job-related duties. We are not allowed to provide how-to advice to persons who are not employed in this industry, or persons who do not perform electrical installation or maintenance as part of their jobs.
    Charles E. Beck, P.E., Seattle
    Comments based on 2017 NEC unless otherwise noted.

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