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A one-gang metal, old-work outlet box with the ears adjusted is mounted on wood lathe in a plaster wall. The LINE grounding wire is attached to the 10/32 screw in the back. This is no longer allowed. The box must have its own separate grounding pigtail that gets connected to all ground wires inside the box.

Install Outlet in an Existing Wall

Dear Mr. Electrician:  I want to install an outlet in an existing wall on a dedicated circuit for my window air conditioner.  I've figured...