How many Romex connectors are allowed through a connector?

tom418March 21, 2012

I'm adding a multiwire circuit which I ran last week. It's time to hookup to the breaker box (GE TM2020CCU). The problem is that all of the knockouts are used on top, where my romex comes from. To preserve a "clean look" around the plywood where the box is mounted on, I'd like to enter through the top.

I noticed that the electrician passed two, sometimes even three romex cables through one cable connector. Is this allowed (three cables)? I would be adding a 14-3 to a connector that has two 14-2 cables through it.

I'm planning on adding a subpanel in the future, with this new cable added to the subpanel. Should I use one of the concentric knockouts on the side for now, and then enlarge it when I add a nipple to feed the sub panel? I will need to make a hole then anyway.

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Title should have been: How many Romex CABLES can pass through a connector! Sorry...

    Bookmark   March 21, 2012 at 2:38PM
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Check the listing of the cable clamp.

Only one unless it is specifically listed for more than one.

    Bookmark   March 21, 2012 at 3:20PM
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Ok then, that solves that problem...
The existing panel is crowded anyway, with almost all of the breakers being thin ones THQP series. The neutral/ground bars are getting crowded too :(

    Bookmark   March 21, 2012 at 4:01PM
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"The neutral/ground bars are getting crowded too"

Some panels are listed for more than one ground in holes in the bar.

NONE are listed for more than a single neutral though.

    Bookmark   March 22, 2012 at 9:27AM
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Brickeye, how about one neutral and one ground in the same hole?

I noticed that the panel installer did this several times. I guess he wanted a "neat" panel, since when this was done, the neutral and its corresponding ground were in the same hole. Was that allowed?

There are numerous empty holes in the neutral/ground bars. Should I take the grounds away from holes containing neutrals and relocate them to empty holes??

And getting back to my original post: I did find one, unused knockout in the top left of the panel. It's concentric, but I was able to open the smallest opening, and used a new connector for my 14-3. That problem solved. Thanks.

    Bookmark   March 22, 2012 at 4:40PM
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"how about one neutral and one ground in the same hole? "

Not allowed.

    Bookmark   March 22, 2012 at 5:18PM
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The NEC does not really address this issue. It does however detail in 110.3(B) to use UL listed or labeled products in accordance with any instructions included in the listing or labeling. The best efforts would be to check the connector manufacturer�s listing or instructions.

ROMEX� NM Cable Enthusiast

ROMEX� is a registered trademark of Southwire Company.
This communication is for general informational purposes only and is not intended to constitute advice. As all the facts and circumstances in any given situation may not be apparent, this communication is not intended to be, and should not be, relied upon by the reader in making decisions with respect to the issues discussed herein, and the reader assumes the risk if he or she chooses to do so. The reader is encouraged to consult an expert before making any decisions or taking any action concerning the matters in this communication. All warranties, express or implied, including warranties regarding accuracy, adequacy, completeness, legality, reliability, safety or usefulness of any information, ARE DISCLAIMED. Southwire Company is not liable for any damages however caused and on any theory of liability arising in any way out of the information provided or the reader's use of it.

    Bookmark   June 1, 2012 at 3:33PM
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Ron Natalie

Brick is right in both his answers. Only one in both cases unless labeled otherwise. Frequently you'll see NM bushings that are approved for two 14-2's. Some bus bars are marked to permit multiple wires under a screw.

    Bookmark   June 2, 2012 at 8:48AM
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"Some bus bars are marked to permit multiple wires under a screw."
Only for grounds.

Check the listing.

    Bookmark   June 2, 2012 at 9:09AM
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