Let's Talk UL.
UL is a joke.
A few years ago, I did all the control work on a power plant. There were a half-dozen or so control cabinets, a 35KV switchgear, a 4160 volt motor control center, and a 480 volt motor control center.
The switchgear and motor control centers were UL listed, the control cabinets were not. These control cabinets had PLCs, generator protection relays, transformer protection relays, etc. in them. The voltages were 120AC, 24DC, and 125DC. Several thousand wires were involved.
The local inspector would not pass the job unless all electrical apparatus was UL listed. A few days later, this guy shows up, looks around a bit, and places UL stickers on each control panel. He never even looked inside any of them! For all he knew, they could have been boxes full of rocks, with lights and meters on the doors.
But now, they're UL listed. The inspector signed it off, and everyone was happy. Every day until the plant was finished, I'd look at those UL stickers and laugh.