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Old 02-23-2010, 10:04 PM   #1
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NM Connectors


I've seen NM connectors (clamps) installed in main panels two different ways (clamp outside the panel with locknut inside the panel, and vice versa). Are both methods acceptable?

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Old 02-23-2010, 10:22 PM   #2
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I've always installed them with the jam nut on the inside of the panel and the clamp on the outside, but that's just because it is what I'm used to seeing. I can't honestly say that there's something illegal about doing it the opposite way, but it would raise eyebrows where I'm from. Technically it would depend on the listing of the specific romex connector itself. When in doubt those little plastic NM grommets work great and install easily!

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Old 02-24-2010, 08:22 AM   #3
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I too install the locknut on the inside of the box. If installed the other way a deduction in box fill should be made for the clamp.
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Old 02-24-2010, 09:22 AM   #4
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If the panel is in use, and cover by sheetrock, I will turn a connector around with the lock nut outside the panel.
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Old 02-24-2010, 10:18 AM   #5
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The Arlington black buttons can be installed from outside the panel thru a small slot.
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