For motor operated appliances, are you supposed to follow 430 entirely or entirely 422? A drain pump cut sheet indicates a 1/2 HP, 115V rating with 7.3 amps. Article 430 tells you to use 9.8 amps for sizing ground fault/short circuit protection and conductor sizing. But since it’s an appliance, do you use the 7.3 amps on the cut sheet?
When to follow 422 for appliances or 430 motors.
- Thread starter cppoly
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kwired
Electron manager
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- NE Nebraska
Without any need for ampacity adjustments you are going to have 14 AWG as minimum conductor either way. Chances are you select 20 amp breaker either way, but 20 is the max for the 7.3 amp cut sheet where art 430 value of 9.8 would allow a 25 amp breaker.
Since it is an appliance you start in 422 and go to 430 wherever it tells you to go there.
Since it is an appliance you start in 422 and go to 430 wherever it tells you to go there.
petersonra
Senior Member
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- Northern illinois
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- engineer
I'm not sure what you're referring to as a drain pump but that does not sound like an appliance to me.
That's part of my confusion of an appliance. What classifies something strictly as a "motor" (430), an appliance (422), or a "motor operated appliance" (430 & 422)??
petersonra
Senior Member
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- Northern illinois
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- engineer
I believe article 422 has a definition section that defines what an appliance is.
kwired
Electron manager
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- NE Nebraska
Me either, but art 100 definition can be a little vague in some cases. Is it built in standard sizes/types probably so which leaves it subject to a lot of things. Is the entire assembly listed as an appliance, maybe maybe not.
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It is very vague. It state 430 is for motor operated appliance and 422 talks about disposals, dishwashers, etc. I usually go by what I think of when the word appliance is used. Mostly kitchen stuff...water heaters etc.
IMO, you have a motor and 430 would be used
IMO, you have a motor and 430 would be used
kwired
Electron manager
- Location
- NE Nebraska
almost all utilization equipment fits the art 100 definition of appliance.
Certain items also fall into other NEC articles like 424, 440, and many items covered in chapters 5 and 6.
Certain items also fall into other NEC articles like 424, 440, and many items covered in chapters 5 and 6.
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