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#201598 - 06/12/11 12:47 PM stranded wire and devices  
Niko  Offline
Member
Joined: Aug 2006
Posts: 356
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.


Be kind to your neighbor, he knows where you live


Work Gear for Electricians and the Trades

#201600 - 06/12/11 02:16 PM Re: stranded wire and devices [Re: Niko]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
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.


Greg Fretwell

#201601 - 06/12/11 02:58 PM Re: stranded wire and devices [Re: Niko]  
Niko  Offline
Member
Joined: Aug 2006
Posts: 356
Campbell, CA
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


#201602 - 06/12/11 03:21 PM Re: stranded wire and devices [Re: Niko]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
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


Greg Fretwell

#201603 - 06/12/11 03:31 PM Re: stranded wire and devices [Re: Niko]  
Niko  Offline
Member
Joined: Aug 2006
Posts: 356
Campbell, CA

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


#201604 - 06/12/11 06:41 PM Re: stranded wire and devices [Re: Niko]  
NJwirenut  Offline
Member
Joined: Sep 2001
Posts: 806
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.


#201605 - 06/12/11 07:14 PM Re: stranded wire and devices [Re: Niko]  
luckyshadow  Offline
Member
Joined: Jan 2005
Posts: 305
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.


#201606 - 06/12/11 09:32 PM Re: stranded wire and devices [Re: luckyshadow]  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 783
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?


#201608 - 06/12/11 10:20 PM Re: stranded wire and devices [Re: Niko]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,099
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.


Greg Fretwell

#201609 - 06/13/11 12:41 AM Re: stranded wire and devices [Re: gfretwell]  
Niko  Offline
Member
Joined: Aug 2006
Posts: 356
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?


Be kind to your neighbor, he knows where you live


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