NEC 312.6 and 314.28

[Isaiah]

In this case the motor term box is being replaced since it’s undersized. The T leads and incoming feeder are 500kCMIL. A single 4” conduit enters the side of terminal box
I’m think the depth of the box is more important here according to 312.6, since the T leads come they the back of the box. So that would be one terminal per cable or 6” deep enclosure and height/width would still be 6x 4” or 24”
Is this correct?


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[Dennis Alwon]

I think 430.12 would apply but this is not my area of expertise

 

[infinity]

I think that Dennis has the correct code section. It's also possible that removing the factory peckerhead and replacing it with a box will violate the motor listing.

 

[Dennis Alwon]

This thread may be the same job

Min sizing of Motor Termination Box per NEC and or MG-1

I've got a large induction 460V, 3Ph AC motor that is being fed by 3-1/C 600kCMIL cable. The motor term box from the Vendor seems to be vastly undersized. What is the best way to calculate the min size required

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