[miamicuse]

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?

 

[Speedy Petey]

You can put two 2-wire NM cables in a typical two-screw NM connector.

 

[Arrow3030]

Every package of NM connector I've seen has a list of approved cables and their quantity. I have a box of the above image that allows two 14/2 cables but only one 12/2 cable. Kinda sucks