When do I need a back box cover plate?
You’ll need a back box cover plate when doing a hardwired installation without using the self-contained cap.
In NYC, where metallic boxes are mandatory, you must use a hardwired setup with a back box cover plate.
When installing in drywall with a hardwired setup (you’ll need a back box, back box cover plate, hardwired outlet, and outlet cover plate).
You don’t need a back box cover plate if you’re using the self-contained cap for your installation.
The cover plate provides a protective layer between the back box and wall, preventing exposed wires and ensuring safety. It also adds reinforcement when mounting in softer materials.
Why isn’t a back box and back box cover plate required when using the self-contained cap for installation?
The self-contained cap is designed to fully enclose and protect the electrical connections, just like a back box would. It includes a built-in housing for safe wiring termination, a strain relief for Romex or similar cable types and integrated support for secure mounting. Because it already meets the safety and functional requirements of a traditional back box — including insulation, accessibility, and cable anchoring — there’s no need for an additional back box or cover plate when using this cap. It simplifies installation and allows for a cleaner, more compact setup.