UPS SCCR

[don_resqcapt19]

I'm using a thermal magnetic breaker that magnetically trips (Ii rating) at 1450A. Doesn't that mean that the UPS could see more than 1kA, all be it for only a cycle or two?

Basically, how can I determine the SCCR of the branch without knowing the device's SCCR? I'm working with UL508A Supplement SB and examples to determine the SCCR of the entire control panel. It will be awesome if someone could help me out of this conundrum.

Thank you...

Branch circuits don't have an SCCR rating...they have an available fault current and the branch circuit OCPD will have an AIC rating

 

[ron]

I don't see anything in 110.10 that says that Ron. I read it as saying if something has a SCCR, you need to design the circuit to not exceed it. I don't see anything saying equipment must have a SCCR.

Also, if the UPS is Listed as compliant with UL 1778 Uninterruptible Power Systems, that standard requires a SCCR for the UPS.