How to determine the right size wire nut?


Old 07-09-07, 10:14 PM
Thread Starter
Join Date: Jun 2007
Location: Seattle
Posts: 64
How to determine the right size wire nut?

I'm wondering how one goes about determining the right size wire nut for a particular purpose?

For instance, I need to connect two solid #14 wires with a single stranded #18.

I have some yellow ones (that say 2 #18 - 3 #12 AWG) that seem like they hold, but that's just guesswork.

Most of the sizing charts I could find on the internet only listed homogeneous configurations.
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Old 07-09-07, 10:45 PM
Join Date: Aug 2005
Location: USA
Posts: 995
Well, [two #14 plus one #18] would be larger than [two #18] and smaller than [three #12] so it looks like the package clearly says it is appropriate for your application.

Also, experience says it is also.
Old 07-09-07, 11:22 PM
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 18,399
The package description gives the minimum and maximum ranges. In your case the minimum is two #18 conductors and the maximum is three #12 wires. Anything in between those extremes is okay.
Old 07-10-07, 09:15 AM
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Join Date: Feb 2005
Location: Near Lansing, Michigan
Posts: 10,537
Some of the wirenut jugs will have all of the possible combinations printed in tiny font on the label. Ideal publishes them here:

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