UL 498B:2017 PDF Download

The UL 498B:2017 standard specifies requirements for receptacles with built-in switching mechanisms. These receptacles are rated for use in ordinary dry locations and are designed to be connected to a branch circuit in accordance with the National Electrical Code.

The standard states that the receptacle with integral switching means should not have a voltage greater than 600V above ground. If an isolation transformer is provided, it should generally furnish power at a lower potential than the primary voltage. Additionally, the output of the device should not be located in a circuit operating at greater than 600V above ground. The switching device itself should be integrated into the receptacle.

Receptacles that are marked with a specific symbol and do not utilize integral switching means intended for energy management and building automation are covered by a different standard, UL 498, titled "Standard for Attachment Plugs and Receptacles."

The UL 498B standard does not directly apply to certain devices but may be used in conjunction with other standards. These include devices with flexible cords or cables, current taps and adapters, devices with male or female screw shells, single and multipole connectors, devices for hazardous locations, devices for telecommunications networks, ground-fault circuit interrupters, surge protective devices, electromagnetic interference filters, cord-connected relocatable power taps, and energy management equipment.