Use the lowest SCCR value among all power circuit components.
Requirements for restricted access have been synchronized. ul 508a 2022 pdf hot
The July 2022 update introduced several "hot" changes to align UL 508A more closely with National Electrical Code (NEC) Use the lowest SCCR value among all power circuit components
Manual motor controllers (like Siemens SIRIUS 3rv20 ) can now be used as supplementary protection for power supplies in specific configurations. ul 508a 2022 pdf hot
Door interlocks are no longer strictly mandatory in all cases. You may no longer need to open the main panel disconnect just to open a door, provided the design meets specific safety philosophies. 2. Termination Temperature & Wire Sizing