UL 508A Frequently Asked Questions

Q. How would you rate the SCCR of a 3 phase (incoming volt) DC power supply (output 24VDC) connnected thru fuses?

A. Supplement SB only applies to panels that contain a power circuit. Control circuits can be tapped from the power circuit and if so, see SB3.2 for the determination of the SCCR rating of the control circuit.

Category: Application

Keywords: rate, rating, 3 phase, DC , 24 VDC