ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
What does your work place look like?
by Bill Addiss - 11/23/20 12:07 AM
Where is Everyone?
by Lostazhell - 11/21/20 04:17 AM
Ground fault remover :-)
by dsk - 11/21/20 02:47 AM
Work Gloves?
by gfretwell - 11/20/20 10:17 PM
Reverse-feeding transformer in PV system?
by winnie - 11/19/20 06:49 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 18 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Motor Lead Termination #87932 05/04/04 06:33 PM
Joined: Feb 2004
Posts: 5
EvanH Offline OP
Junior Member
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?


2017 / 2014 NEC & Related Books and Study Guides
Re: Motor Lead Termination #87933 05/04/04 11:33 PM
Joined: Apr 2002
Posts: 2,527
Bjarney Offline
Page 19 for MSC-series motor-stub splice. Though there may be local variations, bolted connections in motor j-boxes are fairly universal.

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).]

Re: Motor Lead Termination #87934 05/05/04 08:42 PM
Joined: Feb 2004
Posts: 5
EvanH Offline OP
Junior Member
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?

Re: Motor Lead Termination #87935 05/05/04 10:53 PM
Joined: Apr 2002
Posts: 2,527
Bjarney Offline
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.


2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 9
Popular Topics(Views)
271,873 Are you busy
205,730 Re: Forum
193,832 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3