Don't know who this person is but I take exception to his methods of stripping romex. I have been doing electrical for over 30 years and seen a lot of good as well as sloppy wiring. First is never use a utility knife inside a box as this person did. Why? Because if you slip and cut across the wire coating you have now made that conductor useless according to code. Second off you leave way to much jacket inside the box which is considered a part of the box fill. The second method is much better but I was taught to strip the jacket off before putting the wire in the box. Very quick easiest way of rough wiring. I also leave about one inch of jacket inside the box. Next is why the two makings on the stud? All you floor boxes should be at one height and all you switch boxes should be at another height. If you go around having multiple marking on the stud you boxes could be at different heights which is unacceptable. This guy could never work for me.......
Not so sure I'd put all the blame on the plumber, some but not all. According to the law of the California Contractors Board the person primarily responsible for the entire construction project is the general contractor. Even if the home owner themselves are acting as the contractor it is there responsibility to make sure the rest of the trades have done their jobs correctly and to code. The plumber may have been an idiot but the person in charge of the jobs was a bigger idiot for approving the plumbers work.
One of the good parts of building in California is every construction job needs a permit before starting. Every person acting as a sub-contractor needs to be tested before being licensed. Every job is inspected multiple times in the building process, and every inspector has to be tested and licensed. Not saying this could not happen here in CA but the chances are not as good as in states where there are no or little building requirements.
I'd put the blame on the builder since that person was in charge of making sure the project was built correctly.
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