I am installing an upgraded breaker panel and I need to extend the existing branch circuit wires from the existing panel to the new one. I would like to know if it is permissible to run 2 romex 12/2 w/g through a single box connector. I will be using handy boxes as splice boxes and my space is somewhat limited so I would like to make 2 splices in each box and have pairs of romex cables enter the new breaker panel through the same opening.
Wiring – Running multiple 12/2 through a single box connector
wiring
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Best Answer
Short answer is: Yes, you can do that as long as the clamps are labeled or markedly for multiple cables.
If you are extending them to another panel, why not use the old panel as a junction box? You would just need a sheet metal cover for the old panel.