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#87932 - 05/04/04 04:33 PM Motor Lead Termination
EvanH Offline
Junior Member

Registered: 02/10/04
Posts: 5
When wiring industrial 3-phase motors, common practice as I've seen it has been to use wirenuts to connect leads to incoming power wires, and tape them off.

I recently received an IEEE-841 style motor, that has ring terminals on the motor leads. Is there some expectation or regulation that I must use some other kind of wire connection?

Does anyone know a reason I can't just snip off the ring terminals and use the wirenut technique?

Thanks,
Evan

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#87933 - 05/04/04 09:33 PM Re: Motor Lead Termination
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Page 19 for MSC-series motor-stub splice. Though there may be local variations, bolted connections in motor j-boxes are fairly universal. http://tnbelectricalworld.tnb.com/contractor/docs/shrinkon.pdf

In some plants, non-bolted splices are a “dismissible” offense. Given IEEE-841 motors are Petroleum and Chemical—Severe Duty, bolted connections are likely a default requirement.




[This message has been edited by Bjarney (edited 05-05-2004).]

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#87934 - 05/05/04 06:42 PM Re: Motor Lead Termination
EvanH Offline
Junior Member

Registered: 02/10/04
Posts: 5
Thanks for the response, and the splice insulator reference.

So for the splice itself, I put a similar ring terminal on my power conductor, and just use any bolt and nut that are the right size to fit through the ring terminals?

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#87935 - 05/05/04 08:53 PM Re: Motor Lead Termination
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
It may be best to use the existing ring terminal to size the machine bolt and ring terminal for external wiring. The T&B MSCs list a maximum bolt length. Zinc-plated steel hardware with star lockwashers have worked well for me.

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