312.5(C) Cables.
Where cable is used, each cable shall be secured to the cabinet, cutout box, or meter socket enclosure.
This is from the handbook:
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This is something that every electrician should learn early in their career. If they learn it from me it’s a bitter pill to swallow. I am okay with that. The rub is that it can be such a bitch to fix. The workman wants to hear from me why fifteen cables in a clamp is a safety issue worth the grief. I hear, “Can you let it goe this time?” If I let it go this time why would the correction have any merit next time….and there will be a next time.