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Old 03-13-2008, 03:58 PM   #1
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Default Wiring requirements
I'm new in this. I remember there was a formula to determine what the amp size of the conductors or wires need to be based on the amp specs of the load. Does anyone know what it is?

I think load has to be 80% of the breaker size. Is that right?
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Old 03-13-2008, 04:23 PM   #2
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What is the load?
It's all in the code book, just in many places. Start with 210.2; see 210.19; then 210.20, and on and on.

What is it you are trying to do?

Are you an apprentice working for someone?
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Old 03-14-2008, 12:56 AM   #3
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No, i'm not doing this professionally.

Say a plate on an electrical device says 30 amps. This is the only device that is going to be used on this circuit. The breaker has to be 125% or 1.25 times the 30 amps. But wire running between device and the breaker has to able to handle a load greater than 30 amps. Is there a formula or multiplier to determine how many amps of wire to use?
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Old 03-14-2008, 06:23 AM   #4
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There is no way you are a professional with the question you are asking. Really sounds like a DIY'er.
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Old 03-14-2008, 07:53 AM   #5
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