Amperage drop/wire size


Old 11-05-13, 01:07 PM
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Amperage drop/wire size

Need to figure amperage drop/wire size, on buried cable for 70 amps over 200 ft. Using aluminum. HELP!!
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Old 11-05-13, 01:47 PM
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Join Date: Mar 2012
Location: USA
Posts: 8,470
Welcome to the forums!

Amperage doesn't drop with distance. Voltage does. The conservative value is to limit the voltage drop to 3% or less. The calculation for the wire size needed to do that is based on distance, load and wiring method. The information we need is:
  • Is the distance from breaker to load exactly 200 ft?
  • What is the maximum load? So you need a foll 70A?
  • Are you planning to pull individual aluminum conductors in buried conduit, or some other method?
  • Is single-phase 240V correct?

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