I'm looking for information specific to Washington state. I think this state adopted some portions of NEC 90.7 of the NEC requiring that all electrical utilization equipment sold or installed in WA be listed by a WA recognized testing laboratory. For many items, this is fine. However, we have labs containing electrical items that were designed for airplanes (never listed for premises use), or custom things we put together ourselves such as power distribution for that equipment (mostly this is just adapting connectors to power supplies of 28V and 400 Hz).
Does anyone know the true scope of this (utilization equipment can be interpreted to be about anything), and whether things we build to use locally (not for sale) need to be NRTL tested? Is this really an OSHA thing? How much leeway does NEC 590.3(C) give us, as this equipment goes in development and testing labs? Finally, if you take a bunch of UL listed equipment and install it in an equipment rack, have you ever heard of anyone saying you've changed the equipment and the whole rack must now be NRTL tested as an assembly?
Does anyone know the true scope of this (utilization equipment can be interpreted to be about anything), and whether things we build to use locally (not for sale) need to be NRTL tested? Is this really an OSHA thing? How much leeway does NEC 590.3(C) give us, as this equipment goes in development and testing labs? Finally, if you take a bunch of UL listed equipment and install it in an equipment rack, have you ever heard of anyone saying you've changed the equipment and the whole rack must now be NRTL tested as an assembly?
