When was the grounded conductor specifically required in the NEC?
The 1959 edition specified the insulation color for the grounded conductor.
The question arises due to cap vs. exp guidelines for an improvement project to address some deficiencies at an old building on site. Need to know if the building pre-dates the specific requirement for the grounded conductor on a 277V neutral load.
The 1959 edition specified the insulation color for the grounded conductor.
The question arises due to cap vs. exp guidelines for an improvement project to address some deficiencies at an old building on site. Need to know if the building pre-dates the specific requirement for the grounded conductor on a 277V neutral load.