My can light junction box has 2 black clamps for NM cables and there are 3 metal knockout holes on 3 sides of junction box. (Picture shows one of these 3 knockouts).
Given the location of LINE wire and can light locations in celling, can I attach 3 NM (romex) cables with one can light ? Can light junction box has only 2 clamps , but can I use knockout hole ( metal) for 3rd cable? All cables are NM cables
1 LINE cable (through Knockout holes)
2 cables connecting to 2 other can lights. ( Through black clamps)
Take a look at diagram with red color can in question.
Best Answer
You have to use something when ever NM cable enters a metal box or enclosure to protect the cable from abrasion.
If you use a clamp for two cables, it must be rated for two cables of the applicable size. For example the Arlington NM94 is made for a 1/2" trade size knockout and can be used with one or two 14/2 or 12/2 NM cables.