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Old 06-08-2012, 10:47 AM   #1
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Supporting NM-B


I'm going to install 1x4 runners at the bottom of joists in my basement to support 12/3 cable, rather than drill holes. How often do I need to support it along the runner?

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Old 06-08-2012, 11:13 AM   #2
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Supporting NM-B


At intervals no more than 4.5 foot apart and within 1 foot of any box with a clamp or connector. The cable would need to be secured within 8" if there is no clamp.

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Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
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