Earlier quoted context omitted.
EE programs tend to focus on electronics, not electrical systems. But learning how house wiring works is a simple book away. But be careful - unlike electronics, house electrics can kill you. On the other hand, electricians have weird gaps in their knowledge. If I ask them to do something slightly out of the ordinary, this becomes apparent. For example, none of them understand inductive coupling, or even know what it…
Don't you have codes and license requirements for electricians and roofers? In my country, most of what makes electricianing harder than electronicsing is the rules. There are rules about how close you can put mains and low voltage wires, which your guy should have followed even if he didn't know why, rules about what parts of the house you can fix them to, or if they can be laid loosely or must be stapled to the fra…
So I suspect it is not in the building codes. I don't think the codes say anything about about low voltage wires.