DIY & Home Improvement

has wiring run through pipe ? I know codes vary somewhat from state to state but ah ?

Commercial yes, but residential (?)

Metal box's yes but pipe ,most likely not.

As you know at about the time the copper ground was added, electricians still stocking the old wiring added a copper ground separate run along side the wiring. On occasion I have run into that Sometimes the copper ground ran behind the junction box. some point in the 60's is when the copper ground wire was added in code and manufacturing. however there is a bit of space between the code change and manufacturing of the new wire, or what is used today example 12'2 with ground. Code allowed electricians to add the copper ground running along side the house wiring. Back than the grounding three prong plugs didn't exist yet in market.

Think about it, knot and tube to wire through pipe ? Commercial buildings require what yer talking about,residential is a different set of rules. Correct me if I'm wrong and tell what state you work out of if you do correct me.It's a 50's house with 50's wiring, the type of wire that replaced the old knot and tube. It has fabric coating insulation over the 2 wires, ther's paper in there too !