UL 508A SSCR calculations

[tom baker]

The topic of short circuit current ratings has come up several times for UL 508A. Here is a recent article from Graybar Electric on the topic

Graybar-New-UL-508A-Standard-Brochure.pdf

graybar.widen.net

 

[petersonra]

The latest version of ul508a also has some neat allowances for bus bars that are no longer required to be listed or in your procedure as long as you follow their rules in using them.