I agree but that is still not telling me it has to be "Listed" as in UL or other listing companies.
The problem is we purchased a Transition Cabinet from Maysteel and it is not listed by UL, ETL or CA and I am trying to determine if we can use it. It's a nice cabinet, very well made and it is to our utility company specs but it is not listed and I always thought it HAD to be listed but I can't find in the code book where it says it "Shall be Listed"
The NEC does not require all equipment/etc... to be listed, labeled or identified.
Article 230 does not require the listing of equipment for services per se.
As has been posted, 230.66 - the first sentence is as close as you will get to seeing this in the NEC.
There will have to be some kind of label in the transfer switch. The label will have wording similar to: "
Suitable for use as service equipment"
If the transfer switch does not say that, I believe it is suitable for feeders, but not service installation.
Are you installing the transfer switch on the supply side of the service disconnect or the load side?