Am I required to re-certify a UL508A Panel if the standard changes after the panel certified?

[ChrisBElec]

Hello,

I am trying to understand a best practice, or legal mandate, if there is one. If I have a UL508A certified ICP in service and then a new revision of UL508A comes out that puts my panel out of compliance, am I required to address the new standard and re-certify my panel? Or am I grandfathered into my panel being compliant because it was certified to the latest standard at the time of building?

Thanks,

 

[petersonra]

The UL listing is for what left the manufacturer. What happens after that is not relevant.

What change to UL508a would invalidate an existing design anyway? I have not run across such a situation.

 

[ChrisBElec]

Thanks! I do not have an example, but since UL508A does get revised I was wondering if I needed to audit panels that are in use every time a new revision gets released. It sounds like the answer is no, I do not need to review a panel after it is certified.