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Stranded use in recepticle terminations #86181
09/20/03 01:49 AM
09/20/03 01:49 AM
G
gunther  Offline OP
Member
Joined: Sep 2003
Posts: 60
I have noticed that it seems to be common practice in my area to strip stranded wire and leave the insulation on the end of the wire to hold the strands together and then wrap this around a termination screw on a recepticle or a switch. I am sure that I saw a comment and illustration in an old Handbook I had that illustrated this as being a wrong practice, but have looked since and cannot seem to locate this information. In my understanding, stranded should only be terminated using crimp ons or on a termination screw with a cup or where the device has pressure plates. Could anyone help on this?

2017 / 2014 NEC & Related Books and Study Guides
Re: Stranded use in recepticle terminations #86182
09/20/03 04:31 AM
09/20/03 04:31 AM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Gunther I will post it later but the UL white book lists all device terms for stranded or solid.

Not to say using crimps is a bad idea.

Bob


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Stranded use in recepticle terminations #86183
09/20/03 08:59 AM
09/20/03 08:59 AM
R
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
From the UL Guide Information for receptacles (guide RTRT).
Quote
Terminals of the wire-binding screw, setscrew, or screw-actuated back wired clamping types are suitable for use with both solid and stranded building wires.



[This message has been edited by resqcapt19 (edited 09-20-2003).]


Don(resqcapt19)
Re: Stranded use in recepticle terminations #86184
09/20/03 02:03 PM
09/20/03 02:03 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Thanks Don, I did not have time to post that this morning.

Bob

Gunther, Dons the one the filled me in on the same question.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Stranded use in recepticle terminations #86185
09/25/03 08:17 AM
09/25/03 08:17 AM
W
winnie  Offline
Member
Joined: Sep 2003
Posts: 649
boston, ma
While the terminals themselves are listed for solid or stranded wire, what are your thoughts on the specific technique described by gunther? Would you consider this good or bad workmanship?

Specifically: taking the stranded wire, stripping it so that a sufficient length of conductor is exposed, but _leaving_ a length of insulation on the end of the wire, and then wrapping this around the screw terminal. This would keep the strands from coming apart, but would leave and extra dangling bit of wire if the insulation were to fall off.

The technique that I like to use is to strip stranded wire, leaving a bit of insulation on, then using this insulated section to grab and twist the stranded wire tightly, and then to cut this insulated section off. I twist the wire in the 'reverse' direction so that it doesn't 'birds-nest' when I tighten it under the screw. I've sometimes thought about leaving a length of insulation on the wire after the screw terminal, however.

-Jon

Re: Stranded use in recepticle terminations #86186
09/25/03 03:18 PM
09/25/03 03:18 PM
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
winnie:

Some say it is a common practice in their area and some say the short piece keep the strands intact, but I agree with you!

[Linked Image]

I never did, nor was I ever taught to terminate the conductors as suggested.

I doubt that there are any recognized trade publications that would show that method to those who are learning about the installation practices by electricians.

I could be wrong and if so I would like to see the pages whaer they show this method as being acceptable.

[Linked Image]


Joe Tedesco, NEC Consultant
Re: Stranded use in recepticle terminations #86187
09/25/03 07:07 PM
09/25/03 07:07 PM
R
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
I still believe that the best way to terminate stranded wire on receptacles and switches is to twist the strands counterclockwise prior to terminating.
This ensures that tightening the screw will further twist the wires during tightening, as opposed to the untwisting that would occur if the wires were left twisted clockwise.

Try it sometime!

Re: Stranded use in recepticle terminations #86188
09/25/03 07:13 PM
09/25/03 07:13 PM
I
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
I will. [Linked Image]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
Re: Stranded use in recepticle terminations #86189
09/26/03 11:12 AM
09/26/03 11:12 AM
S
SvenNYC  Offline
Member
Joined: Aug 2002
Posts: 1,691
New York City
Redsy,

I have tried the counterclockwise twist after I saw your suggestion here.

Makes attaching new plugs and sockets when rewiring table & floor lamps much easier!!!!

Looks neater too.
*********************************************
Gunther, by your argument, then lampholders for table lamps and most regular household Nema 1-15 plugs and connectors must only be wired with solid wire.

The screws on these things sure don't have any pressure plates or "cups". And sometimes I think screws are too small to do the job properly....and in a lot of cases there is no space for crimp-on terminals. You have no choice but to wrap the wire directly around the terminal screw.

[This message has been edited by SvenNYC (edited 09-26-2003).]

Re: Stranded use in recepticle terminations #86190
09/27/03 05:22 AM
09/27/03 05:22 AM
G
gunther  Offline OP
Member
Joined: Sep 2003
Posts: 60
Thanks everyone for your thought-provoking replies and insights. I especially like the suggestion of cutting off the tailing end of insulation after tightening the terminal screw. Its great to have a place to share experience so that perhaps the quality and craftsmanship of the trade can be improved. Just for clarification, I am not trying to advance argument, just trying to learn. Thanks.

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