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I am trying to determine if I need 4 AWG or 3 AWG to wire…

Customer Question
Okay. I am...

Okay. I am trying to determine if I need 4 AWG or 3 AWG to wire the service lines from a 18kw standby generator with a 40' run. My issue in reading the ampcity charts is understanding the 60c vs. 75c vs. 90c temp columns using THHN wire.

Contractor's Assistant: I'll do all I can to help. How long have you been dealing with this?

Researching getting ready to start the work.

Contractor's Assistant: Do you plan on doing the work yourself?

Yes

Contractor's Assistant: Anything else we should know to help you best?

Will be run in conduit (PVC interior and flex outside to the generator. Will also be running 14awg 600v THHN control wires.

Submitted: 1 year ago.Category: Electrical
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Answered in 4 minutes by:
10/25/2016
Electrician: Mike G., Master Electrician replied 1 year ago
Mike G.
Mike G., Master Electrician
Category: Electrical
Satisfied Customers: 8,317
Experience: Proven Professional 49 years Experience
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Hi, I'm Mike and I'll be assisting you. Please stand by while I review your question.

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Electrician: Mike G., Master Electrician replied 1 year ago

The #4 copper will be acceptable for the installation.

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