Re: Outbuilding wire

Posted by John T on October 08, 2023 at 11:56:21 from (45.16.200.171):

In Reply to: Outbuilding wire posted by waugh621 on October 08, 2023 at 09:59:55:

Your question: What gauge wire would we need to run?

When I was practicing power distribution the way I did it in accordance with NEC guidance was:

1) Compute the Maximum Continuous Current

2) Select conductors to have a minimum ampacity no less that 125% of the MCC

3) Compute Line Voltage drop and if necessary (its excessive) upgrade conductor
ampacity

4) Size the Overcurrent Protection Device to adequately protect the Conductors

Conductor ampacity and voltage drop calculators are readily available on the net

You need to choose your wiring method and conductors such as but not limited to direct burial cable,,,,,,,,Conduit with enclosed THWN Conductors,,,,,,,Copper or Aluminum wire.

For 120/240 you need to run 4 wires, 2 Hots, Neutral, Ground and the sub panel needs to have separate electrically insulated and isolated Neutral Buss and Equipment Ground Buss. That buildings electrical service needs to be grounded..

I would install at least a 60 amp much better yet a 100 Amp service to allow for upgrades and equipment.

John T Its electrical so you can expect a ton of responses

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