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2011 Code does not seem to cover how many raceways of NM-B (Romex) can be layered when stapling. Any insight? College discussion.
 

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Follow manufactures direction for use of staples. Some are rated for one cable. Some are rated for two cables.
 

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Techy, (or others), NEC 2011 Article 334.80 only addresses ampacity (para 2) through openings in wood framing. Article 330.30 A states....installed so as not to damage the cable. Seems like an AHJ or electricians call?
 
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