mattamatta said:
Pro audio gear in general is very loose with standards compliance. Many manufacturers are small builders (even the name-brand companies tend to be low volume as far as electronics manufacturing goes) and either don't know or don't care. The industry volume is pretty small so they're not likely to get called out.
I guess this depends on how you define "pro audio gear". Serious established manufacturers pursue safety agency approval for simple liability concerns. At Peavey we got sued over a consumer death, but UL defended our design's safety integrity with us in court. I am pretty confident that Yamaha, Sony and other large companies that sold "pro audio products" followed the rules.
A lot of manufacturers would be hard pressed to show data to back up design specs, EMC test, standards compliance, etc. if called upon. It tends to not have been an issue in the marketplace, so it just hasn't been addressed.
Indeed, not a concern until it is... even if a small company that ignored the rules didn't kill anybody, if they became too competitive with an established rule following company odds are they would get narc'd on. I've seen products that didn't have UL stickers get dragged out of an AES show but that was a different issue with City of LA pimping their own, on the spot approvals. :
Even besides the liability I prefer to not kill people. I could probably get away with selling my outlet tester without the expensive UL certification process but I choose not to.
I am not aware of rules being grandfathered in, while if regulations change, they might grant a variance for finished goods already finished and stickered. I had to wrestle with UL once when they wanted me to pull finished goods from a warehouse to add an internal fuse stickers, that nobody was likely to ever see. The inspector's boss was more reasonable than that inspector. (But I did jack up the factory pukes who didn't place the required fuse stickers :
and made sure it never happened again. )
JR
PS: regarding different versions of what is allowed, back last century when power amps first grew large enough to exceed the nominal continuous current ratings for outlets and line cords, one UL office was accepting conventional line cords allowing for the reduce duty cycle of real world music power, while the other UL office was still asking for 30A camper plugs.
I called and suggested they get their stories straight (which they did eventually accepting the more reasonable line cords at both offices).