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Service panel in basement is mounted directly to block wall just below the joist. I want to add new circuit cables, NM-B-14-2, through side holes using a knockout clamp. If the side hole is more than 12” below the joists do I need to secure the cable between the hole and the joist? How should it be secured?

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The simplest thing is probably to attach a 1x6 flat to the block wall on either side of the panel as a cleat for staples. That will let you keep it tidy without too much work or expense.

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