garygid wrote:Does that mean that if the OEM gets one resistor from a different supplier, the original Listing no longer applies?
Legally, what is the "Listing" law (if you already know)?
Or, are you just guessing?
Most items can be repaired and serviced, right?
No, but a repair person "may" put in a part that is not the right value in a power supply causing a hazard. You get the point and it was not tested with the new value, it is no longer UL approved based on the operating spec. The important issues around UL are wire gauge, power handing, protection, insulation, etc, etc. I have many UL approved Leviton devices I don't think are safe at all and I have some that are not that are far safer. UL is not a govt regulator and there are also other testing labs and certifications. There are many crappy unsafe UL products out there for sure.