multiple motor junction boxes

[sdirt]

Our company manufactures industial machinery with 1-4 ac motors ranging from .5 hp to 25 hp. These machines are not currently factory wired. Several customers are requesting that the motor wiring (from all 4 motors) be brought to a terminal block in a central junction box to make it easier for the on site electricians. Is this allowable according to the NEC or NFPA 79?

 

[itsmoked]

I don't see why not. How is that any different than running them all from the same power enclosure?

Keith Cress
kcress -

http://www.flaminsystems.com

 

[sdirt]

The motors would all be on separate circuits. Someone told me that separately disconnected circuits cannot run through one junction box according to NFPA 79.

 

[dpc]

That might be true if you were bringing multiple external power sources to the skid, but even then I'm not sure.

But as I understand what you are trying to do, all of the motor circuits are powered from your control panel and killing power to that will de-energize all of these motor circuits?

I don't see a problem with that, but I'm not a NFPA 79 expert.

 

[sdirt]

I am concerned because we don't provide the control panel and so I can't say with certainty that they will all be connected to one control panel.