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Old 08-19-2008, 08:21 PM   #16
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The overcurrent protection is built into the motor, all i'm providing with a breaker is short circuit and ground fault protection.
Hmm, my furnace has a 60 amp breaker in it. Does this mean I could feed it with an 80 amp breaker, even though the cable used was not legal for 80 amps?

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Old 08-19-2008, 08:23 PM   #17
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Hmm, my furnace has a 60 amp breaker in it. Does this mean I could feed it with an 80 amp breaker, even though the cable used was not legal for 80 amps?

Your furnace has a 60 amp breaker? Must have heat strips?
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Old 08-19-2008, 08:23 PM   #18
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Air conditioning units, welders and motors all have special rules.

Of these, in my opinion, only air conditioning units have any relevance in a residential setting.
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Answers based on the 2008 & 2011 NEC.
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Old 08-19-2008, 08:24 PM   #19
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Your furnace has a 60 amp breaker? Must have heat strips?
Yes, heat strips. Technically it's an "air handler" I guess.

That picture helped.

Last edited by gp_wa; 08-19-2008 at 08:37 PM.
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Old 08-19-2008, 08:28 PM   #20
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Air conditioning units, welders and motors all have special rules.

Of these, in my opinion, only air conditioning units have any relevance in a residential setting.
I agree, its all you will see in a residence.
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Old 08-19-2008, 10:21 PM   #21
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A 90 is legal... why use an 80?
Maybe I'm missing some obscure code article for AC loads but doesn't SER fall on the 60C chart?

338.10(B)(4)a
334.80
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Old 08-20-2008, 05:37 AM   #22
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Maybe I'm missing some obscure code article for AC loads but doesn't SER fall on the 60C chart?

338.10(B)(4)a
334.80
Under the 2008 it does, 2002, and 2005 its under the 75degree chart.

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