Door interlock requirements were modified to align with NFPA 79, generally eliminating the need to interlock all doors for restricted access.
While the standard covers a wide range of industrial applications—including crane or hoist controls, marine equipment, air conditioning, and refrigeration—it explicitly does cover equipment intended for hazardous locations, motor control centers, or fire pump controllers, which are covered by separate standards like UL 1203 and UL 218. ul 508a 2022 pdf free
(like many circuit breakers) can be used according to their data sheets. Door interlock requirements were modified to align with
: UL 508A is a standard published by Underwriters Laboratories (UL), a non-profit organization that sets safety standards for products. Specifically, UL 508A is the Standard for Industrial Control Devices, which covers requirements for industrial control devices, including controllers, sensors, and other equipment used in industrial applications. : UL 508A is a standard published by