I've tried to search this here, old 20-30's building, orig wired in old bx (four spirals of steel around rubber, cambric, then cambric jacket, 2 cond no ground cond.)
Previous owner had someone upgrade the receptacles to decora type grounded, but no pigtail to the box. the main service was replaced in the last 20 years. question is are these replaced recep's in violation, or accepted under previous code, can this grade of bx be used for grounding? thanks chris
