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#201598 06/12/11 12:47 PM
Joined: Aug 2006
Posts: 356
Niko Offline OP
Member
Stranded wires under the device terminals. I know it is not an NEC requirements but i need help finding the answer if it is allowed or not.
I looked in my UL 2010 white book but i wasn't able to find anything.

Is it a manufacturer instruction that stranded wires can not be installed on the devices or UL requirement?

Thanks.


Be kind to your neighbor, he knows where you live

Joined: Jul 2004
Posts: 9,669
Likes: 6
G
Member
Standard devices are listed for stranded or solid wire.

From the White book 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.


Greg Fretwell
Joined: Aug 2006
Posts: 356
Niko Offline OP
Member
Unless the instructions state otherwise right?

Last edited by Niko; 06/12/11 03:05 PM.

Be kind to your neighbor, he knows where you live

Joined: Jul 2004
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Likes: 6
G
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I am not sure how the instructions can defy the listing standard and still call themselves listed.
Do you have an example?

I know the back stabs are solid only but this refers to the various styles of screw terminal


Greg Fretwell
Joined: Aug 2006
Posts: 356
Niko Offline OP
Member

From Pass & Seymour:

Side wire accepts #12 #14 AWG solid wire.

For trade master TR receptacle 3232

Last edited by Niko; 06/12/11 03:31 PM.

Be kind to your neighbor, he knows where you live

Joined: Sep 2001
Posts: 806
N
Member
With stranded wire, I always use the pressure plate type receptacles, or put spade lug crimps onto the conductors for use with the standard screws.

Joined: Jan 2005
Posts: 315
L
Member
According to the UL white book

Receptacles are listed to use stranded wire as long as it is terminated by one of the following: wire-binding screw, setscrew,or screw actuated back wired clamp type terminal

Switches are not listed to use stranded wire.

Spade lug or fork crimp terminals on the stranded wire is not a listed method for terminating the conductor to the device.

Joined: Jul 2004
Posts: 783
L
Member
Does the stranding have to be the standard 19 strand or could it be the extra fine stranding with a strand count of 39 or 51 strands?

Joined: Jul 2004
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G
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Table 8 specifies the stranding and that fine stranded wire is not it. You really get into this when guys stuff it in a regular set screw lug. You need the kind with a shaped washer on the set screw to catch all the strands and compress them in the lug.


Greg Fretwell
Joined: Aug 2006
Posts: 356
Niko Offline OP
Member
Originally Posted by gfretwell
Standard devices are listed for stranded or solid wire.

From the White book 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.


I agree, but if the manufacturer states solid only then you have to follow instructions that come with the product. Right?


Be kind to your neighbor, he knows where you live

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