if someone just pays attention to the details, wiring is not the difficult and should never result in a fire. this is someone cutting corner or not doing their homework.

What really scares me is when I meet growers who wire their own stuff but they've never heard a term like, "continual load" before. Or inductive versus resistive...

just do your homework and youre fine. or find someone like the OP who knows what they are doing and let them do the work for ya.