Ul 508a 2022 Pdf Hot Jun 2026

: The 2022 update aligned requirements with NFPA 79, meaning door interlocks are no longer mandatory for all doors when power is present. You no longer strictly need to open the main panel disconnect to access the enclosure.

: Door interlocks are no longer universally required; it is no longer necessary to lock all doors or open the main disconnect to gain interior access if specific safety conditions are met. Feeder Circuit Sizing ul 508a 2022 pdf hot