How many NM-cables allowed in an NM-connector clamp?
Saturday, August 8, 2020
The National Electrical Code does not adress the issue of how many cables are allowed in a single connector. It only states that “where cable is used, each cable shall be secured to the cabinet…” [NEC 312.5(C)]. The number allowed is based on the UL-rating. Most NM-connectors are UL-approved for securing only one NM-cable to a panel box. But some are rated for two #14 or #12 cables, and we know of one 3/4” connector that is rated for three.
Check the box for the number approved by the manufacturer, but it’s definitely not more than three. So the example shown at the arrow above, that clamps a total of five NM-cables (one is hidden in back) is not acceptable.
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