This is not true. The UL label is not a "requirement". In fact Underwriters Laboratory has no government affiliation what-so-ever, its a distinct entity. UL isn't the "requirement" normally, just an "acceptable safety certification", it has just come to pass that UL is the defacto safety certification in the US, UL has cornered the market.
Safety certification of some sort is only "required" in some markets, some jurisdictions, etc. For instance a safety certification is required for devices in a public school, is usually required by the local fire inspector in commercial structures. etc.
Getting a UL stamp on a consumer device is actually just a "cover your ass" move. If a device were to short out and kill someone or set a structure on fire, the existence of the UL certification allows the manufacturer to avoid legal responsibility for damages in most cases.
The only generally applicable certifications that are actually legally required for sale to end users are the FCC part 15 electrical interference tests. Other than that, there are market requirements for schools / hospitals but those are not requirements for sale, but rather requirements for use in particular markets.
> The consumer does not have to know about UL labels or other safety markings. If the device doesn't have the required markings, the vendor is not allowed to sell them.
My point was that this isn't true. You can sell devices without UL safety stamps, there is no government regulation that says you can't. If your using the device in a certain context your fire inspector may call foul but that is completely different from a consumer not being able to purchase something because the "vendor is not allowed to sell them".
Safety certification of some sort is only "required" in some markets, some jurisdictions, etc. For instance a safety certification is required for devices in a public school, is usually required by the local fire inspector in commercial structures. etc.
Getting a UL stamp on a consumer device is actually just a "cover your ass" move. If a device were to short out and kill someone or set a structure on fire, the existence of the UL certification allows the manufacturer to avoid legal responsibility for damages in most cases.
The only generally applicable certifications that are actually legally required for sale to end users are the FCC part 15 electrical interference tests. Other than that, there are market requirements for schools / hospitals but those are not requirements for sale, but rather requirements for use in particular markets.