Switchgear UL 1558 Listing

[FaradayFF]

Hello folks,
Are low-voltage switchgears in the US built to UL 1558 rating by default? There is an IEEE C37.20.1 standard that is used to govern switchgear construction. I wasn't sure if UL 1558 adherence needs to be specified in the tech spec for a switchgear, or whether it is assumed that most US vendors such as Eaton, Square D build the switchgear to the UL 1558 standard already. I know that UL 1558 provides for a robust construction, but it could also be expensive.
Thank you for your thoughts.
EE

 

[jim dungar]

If you want UL 1558 you have to specify it.

 

[ron]

I don't think NEC Article 408 requires switchgear to be listed, but I think it is a good idea and you need to specify it as 1558. We often specify Switchboard UL 891 where we used to specify SWGR in the past due to cost and lead time, since we don't use the 30 cycle SCCR anymore.

 

[FaradayFF]

Thanks guys. What's the rough price difference between UL 1558 listed and non 1558 listed switchgear?

 

[jim dungar]

Thanks guys. What's the rough price difference between UL 1558 listed and non 1558 listed switchgear?

I wouldn't think much, for a basic setup, most manufacturers use similar breakers and draw out mechanisms. But no one buys switchgear because it is cheap.