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For questions about the National Electrical Code, NFPA 70. Just about all US jurisdictions that have adopted an electrical code use the NEC, often with a handful of local or state level amendments.
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votes
Why does NEC require circuit breaker locks only on hard-wired appliance circuits?
Your picture is actually showing the incorrect way to use the shackle. It is dangerous to leave the shackle like this when not in use. In your picture the breaker is ON. The shackle should be in the o …