I forget and I know this question popped up after last years hurricane/snowstorm in the east. One breaker interlock company lost it's UL listing. Which one was it? Did they ever get it back? Anyone know?
His main complaint with the interlock is the generator is set up as an SDS so you have a parallel neutral with it and the panel being bonded. He also points out all new "listed" generators have GFCI outputs that force the SDS setup. The MBJ would trip it. Of course if you look at just about all of the Home Depot type generators, they are not listed. (no GFCI) It gets pretty silly after that. The strange thing is he has no problem with putting a cord and plug on furnace blowers and submersible pumps. That is his "legal" way to use a portable generator.
I was checking the OSHA site for NRTL companies and that Wyle Lab, was not listed. They make those interlocks for a number of service panels and they say that they are tested to UL *** standard.
This came off the OSHA site:
A Few Minor Exceptions
In general, under 29 CFR Part 1910, products required to be approved must be NRTL approved. However, there are a few exceptions. Most notably, for electric products, there are two exceptions. If the electric products are of a kind that no NRTL approves, then OSHA allows approval of the products by a Federal agency or by a State or local code authority that enforces NEC workplace safety provisions. The other exception concerns "custom-made equipment," which designates equipment designed, made for, and used by a particular customer (i.e., unique or one-of-a-kind items). In this case, the employer must demonstrate safety based on test data provided by the manufacturer. As can be seen, these exceptions are very narrow.
As indicated earlier, NRTLs can use testing done by other parties under certain programs allowed by OSHA. These other parties include product manufacturers and can be located anywhere in the world. While using these programs can minimize the work that the NRTL must accomplish itself, the NRTL must exercise adequate control to ensure that other parties are doing the activities appropriately. Nonetheless, these programs can reduce the time and cost necessary for product certification.
Well, everything I have found on the subject seems to indicate that the NRTL listing for all products previously tested by Wyle Labs is still valid and has not been revoked in any way, which would make sense. Only WYLE Labs themselves are directly affected by having their NRTL recognition revoked by OSHA as of August 24, 2011, but all equipment that was approved by them as an NRTL before this date is still valid and acceptable for use, just as it was before this revocation occurred.
The last paragraph states "The DATES section above provides the effective date of revocation. Consequently, the Agency no longer accepts product certifications made by Wyle on or after this effective date."
Products certifications from Wyle Labs made after August 24, 2011 would no longer accepted by OSHA, but according to the interlockit website, those interlock kits were tested in 2005 and revised in 2009, so are still NRTL approved and recognized by OSHA. Interlockit Testing
The idea of an interlock is accepted by U/L: since Schnider sells one for their SqD and Homeline panels. I guess that not being a NRTL would be a problem tho if you chose not to accept it. Personally, this is a simple enough device that if it looks like it works, it works. I could see a guy in a machine shop making a real nice one but it still would not be listed.