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#201598 - 06/12/11 09:47 AM stranded wire and devices
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
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.
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#201600 - 06/12/11 11:16 AM Re: stranded wire and devices [Re: Niko]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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.
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#201601 - 06/12/11 11:58 AM Re: stranded wire and devices [Re: Niko]
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
Unless the instructions state otherwise right?


Edited by Niko (06/12/11 12:05 PM)
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#201602 - 06/12/11 12:21 PM Re: stranded wire and devices [Re: Niko]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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
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#201603 - 06/12/11 12:31 PM Re: stranded wire and devices [Re: Niko]
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA

From Pass & Seymour:

Side wire accepts #12 – #14 AWG solid wire.

For trade master TR receptacle 3232


Edited by Niko (06/12/11 12:31 PM)
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#201604 - 06/12/11 03:41 PM Re: stranded wire and devices [Re: Niko]
NJwirenut Offline
Member

Registered: 09/15/01
Posts: 816
Loc: Bergen County, NJ
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.

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#201605 - 06/12/11 04:14 PM Re: stranded wire and devices [Re: Niko]
luckyshadow Offline
Member

Registered: 01/04/05
Posts: 305
Loc: Maryland USA
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.

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#201606 - 06/12/11 06:32 PM Re: stranded wire and devices [Re: luckyshadow]
LarryC Offline
Member

Registered: 07/05/04
Posts: 776
Loc: Winchester, NH, US
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?

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#201608 - 06/12/11 07:20 PM Re: stranded wire and devices [Re: Niko]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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.
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#201609 - 06/12/11 09:41 PM Re: stranded wire and devices [Re: gfretwell]
Niko Offline
Member

Registered: 08/17/06
Posts: 358
Loc: Campbell, CA
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?
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