My own home was converted to a legal duplex in 2016. The work involved connection of a service lateral to 2 distribution panels. It was permitted, performed by a large well known contractor, and inspected by a city inspector. At the time I was surprised that they had every breaker out of the existing distribution panel and reassembled the entire thing. I have several questions about the panel.
1: Several breakers are double tapped, one is triple tapped. (3 conductors on one breaker.) If I see this on an inspection do I automatically recommend evaluation by an electrician? (I would imagine that these breakers, Westinghouse, are approved for double tapping?) Do I need to research whether the double conductor and triple conductor are allowed for the breaker?
2: Since the wire insulation only, not the actual wire, is visible for each conductor, am I properly evaluating only the presumed wire guage based on the size of the visible conductor jacket? (Sorry this is a stupid question, I realize it must be.)
3: The electrician capped off the abandoned original service conductors with electrical tape. If I see this on a real inspection, do I recommend evaluation by an electrician?
4: I believe I recall that wire nut connections are allowed inside a distribution panel. Is this correct? Should the triple conductor breaker have instead been a single conductor with a wire nut connection inside the panel?