fault current bracing

[rovineye]

I have a 480 v motor controller contactor mounted to a back panel, and the panel is mounted in an enclosure with 4 each 3/16 ss 316 bolts (140K PSI each). I know the available fault current is 30kA. How can I determine if the bolts can withstand the fault?

 

[alehman]

There are standards such as U.L. 50 and NEMA 250 that pertain to construction of electrical enclosures. Also U.L. 508 governs construction of industrial control panels. One of these may provide guidance.