Feeder wire for sub panel

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Old 11-07-16, 03:36 PM
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Feeder wire for sub panel

if you were putting a 100 amp subpanel 80 ft away from the main would you use 2 awg copper?
I assume the neutral has to be the same size?? would you just drive a new ground rod to save
running a ground??
Can you find 2 awg for 1.25 a ft??
 
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Old 11-07-16, 04:10 PM
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Depending on where the subpanel is going you MAY need a ground rod but you DO need four wires. Two hots, neutral and a ground wire. #2 THWN copper from the depot is about $1.50'.
 
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Old 11-07-16, 04:14 PM
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Actually I'd run three #1 aluminum XHHW-2 and a #6 aluminum XHHW-2 for the EGC for 100A. You need 2 ground rods at the detached structure for the electrode system plus the EGC back to the house main panel.

Edit the #1 aluminum is about $0.43 a foot, so for total of the four conductors you are looking at less than $1.60 a foot. This wire does need to be in conduit.

See here.. https://www.wireandcableyourway.com/XHHW-2/

USE-2/RHH/RHW-2, is direct bury.
See here... https://www.wireandcableyourway.com/...HW-2-Aluminum/
 
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Old 11-07-16, 05:49 PM
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Depending on the load you may not need to supply a "100 amp" subpanel with 100 amps. For instance most garages are fine on 60 amps or less. What is the purpose of the subpanel?
 
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Old 11-08-16, 05:15 PM
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alum will be ok. and 60 amps is enough too. so 100 ft would be about 1500 for wire.
Way more than 30 years ago.insane.
 
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Old 11-08-16, 05:53 PM
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1500? It will be about $150-160 for 100ft.
 
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