100 amp sub panel in garage.

[kennneth1]

Thanks Action Dave.

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[peter d]

A 100A panel does not equal a 100A load. For some perspective my whole house never has pulled more than 80A. That is with double electric oven and two electric dryers.

This is the poco connects 3 all-electric houses to a 50 kva transformer.

 

[infinity]

Hello everyone,
I'm installing a 100 amp sub panel in a detached garage. The feed is coming from and 200 amp panel at the main house. The run is 80' long and will have three conduit bodies in it. My question is, would #2 copper be the correct conductor for this project? I'm using the 75 degree table to compensate for the ratings on the breakers. The cable will be THHN.
Thanks for all your help with this matter.
Best,Ken.

#2 or #3 copper. I would use 3-#3 THHN/THWN conductors with a #8 EGC. You'll need a GES at the separate structure which would typically be 2 ground rods. If you want to use aluminum to save some money then #1 with a #6 Al EGC.

 

[kennneth1]

Thanks, infinity.

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[JFletcher]

Kenneth, the reason I asked about load calculation is that if you only need say 60A, you *could* run #6 Cu/#4AL to the 100A subpanel (which I'm assuming is being bought partially based on cost and availability) if it were coming from a 60A breaker in the main panel. You could also use #2Cu, which is a bit of overkill at 80' unless for some reason you want voltage drop to be nearly negligible even with an almost fully loaded panel (a nice jacuzzi will pull nearly 50A by itself). I also wondered if this was a test question...

 

[GerryB]

I checked the definition and I stand corrected. :ashamed: Thanks.

So considered a feeder but since it's not supplying the entire dwelling load no discount. We always use it and in the back of my head is worst case scenario put a 90 amp breaker in. (unless for some reason it has to be a 100)