Receptacle for a Cord and Plug connected motor

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klm0824

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Baton Rouge, LA
We have an application where we are using a 480V, 1HP, 7A rated receptacle for an industrial cord-and plug connected dryer. Dryer is an assembly on a cart of sorts, with wheels for mobility. Dryer has small motor and heating element (not sure of the exact ratings) and has a local 30A fused disconnect. Question is, what size circuit breaker to use to protect the receptacle? We are thinking that we have to protect it for the 7 Amps, but we can't get a CB rated at that. Is there some exception in the code that will allow us to use a larger CB?
 
Re: Receptacle for a Cord and Plug connected motor

The receptacle can be protected like any other branch circuit (430.42(C)) as long as the equipment has it's own seperate motor overload protection (430.42(B)).

[ December 15, 2005, 11:04 AM: Message edited by: jim dungar ]
 
Re: Receptacle for a Cord and Plug connected motor

I have a somewhat related Q. If we had a 30A motor receptacle, could we use a higher OCPD for the motor start up, or stated another way; Can you put a 30A twistlock on a 50A OCPD?
 
Re: Receptacle for a Cord and Plug connected motor

Originally posted by jes25:
I have a somewhat related Q. If we had a 30A motor receptacle, could we use a higher OCPD for the motor start up, or stated another way; Can you put a 30A twistlock on a 50A OCPD?
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No, 210.21(B)(3)
 
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