Combining two NM-b wires through one single connector

Old 02-20-16, 09:47 AM
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Combining two NM-b wires through one single connector

The KO holes on top of my electric panel is getting almost used up.

Most of what I have are EMTs, but I do have six NM-b wires that use up six 1/2" KO holes.

Is there a way I can combine two 12-2 NM-b wires to share a single 1/2" KO hole? If this is possible I would immediately free up three unused KO holes.

I have seen some double barrel or duplex metal clamp connectors for two wires such as these.

Can I use these to share one KO hole between two NM-b wires?
Old 02-20-16, 10:03 AM
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Yes..... those connectors are designed for two cables..... NM-b included.

Many standard NM-b connectors can also be used with multiple cables.
  • UL/CSA NM/NMC Cable Size......
  • (1) 14/2 , 12/2, 10/2, 14/3, 12/3, 10/3, 8/3, or
  • (2) 14/2, 12/2, 10/2, or
  • (3) 14/2

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