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Discussion Starter #1
We are installing some portable chilling equipment in an industrial facility. The owner wants the equipment installed with a cord and plug.

The compressor has an FLA of 31.2A so we are protecting it with a 40A breaker - The only receptacle size that would work is a 50A 15-50R.

Since it is an industrial facility, is it acceptable to install a 50A receptacle on a 40A Circuit?
 

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210.21 Outlet Devices.

(B) Receptacles.
(1) Single Receptacle on an Individual Branch Circuit.

A single receptacle installed on an individual branch circuit shall have an ampere rating not less than that of the branch circuit.
 

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Discussion Starter #3
210.21 Outlet Devices.

(B) Receptacles.
(1) Single Receptacle on an Individual Branch Circuit.

A single receptacle installed on an individual branch circuit shall have an ampere rating not less than that of the branch circuit.
Thanks,
I know for a 40A range you can use a 50A receptacle, but this is a different scenario.

They have a bunch of portable water cooled chillers with 1HP motors that are installed cord and plug to a 30A twicktock. I am trying to determine if these are even permitted to be installed cord and plug.

I would rather just install fused disconnects and be done with it, but obviously they are asking why it has to be different than all of their existing equipment
 

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Thanks,
I know for a 40A range you can use a 50A receptacle, but this is a different scenario.

They have a bunch of portable water cooled chillers with 1HP motors that are installed cord and plug to a 30A twicktock. I am trying to determine if these are even permitted to be installed cord and plug.

I would rather just install fused disconnects and be done with it, but obviously they are asking why it has to be different than all of their existing equipment
All this stuff is one one circuit?
 

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Well since they are motor loads with a 30+ fla I don't know why you've got them on a 40 amp breaker. Is 480 volt available in this place?
 

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Depending on the exact use I bet that Hubbell makes something that would work, or another option is Meltric plugs. Go to the supply house and ask to see their hubbell catalog. I just picked up a 100A cord end and recept for a 15hp motor, pretty sure they will have something rated for 40A.
 

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jarhead0531 said:
Depending on the exact use I bet that Hubbell makes something that would work, or another option is Meltric plugs. Go to the supply house and ask to see their hubbell catalog. I just picked up a 100A cord end and recept for a 15hp motor, pretty sure they will have something rated for 40A.
This doesn't sound like the kind of place that'll spend the money on that
 

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ponyboy said:
Well since they are motor loads with a 30+ fla I don't know why you've got them on a 40 amp breaker. Is 480 volt available in this place?
It's a motor compressor with 31.2 FLA ...I can size my ocpd up to 175%.
 

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NJWVUGrad said:
It's a motor compressor with 31.2 FLA ...I can size my ocpd up to 175%.
Sorry I didn't do the math. But anyways what voltage is it
 

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Thanks,
I know for a 40A range you can use a 50A receptacle, but this is a different scenario.

They have a bunch of portable water cooled chillers with 1HP motors that are installed cord and plug to a 30A twicktock. I am trying to determine if these are even permitted to be installed cord and plug.

I would rather just install fused disconnects and be done with it, but obviously they are asking why it has to be different than all of their existing equipment
That 50a receptacle should have conductors rated @ 50 amps too. You could put a 50 amp receptacle here, it would just have to be on a 50a circuit. Are these factory wired with the 30a twistlock?
 

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KGN742003 said:
That 50a receptacle should have conductors rated @ 50 amps too. You could put a 50 amp receptacle here, it would just have to be on a 50a circuit. Are these factory wired with the 30a twistlock?
The wires are protected by the breaker, how does the receptacle figure in that?
 
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