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Joined: Aug 2006
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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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Joined: Jul 2004
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Standard devices are listed for stranded or solid wire. From the White book RTRT 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
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Unless the instructions state otherwise right?
Last edited by Niko; 06/12/11 03:05 PM.
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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
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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.
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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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Joined: Jan 2005
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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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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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Joined: Jul 2004
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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
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Standard devices are listed for stranded or solid wire. From the White book RTRT 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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