knob and tube wire and romex

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al hildenbrand

Senior Member
Location
Minnesota
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Electrical Contractor, Electrical Consultant, Electrical Engineer
Re: knob and tube wire and romex

The general requirement that all receptacles be grounded appeared for the first time in the 1962 NEC. GFCIs came in the 1971 NEC.

The actual date of enforcement of those Codes was, as now, tied to local adoption.
 
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