Just screwed into the socket. Provides a two prong socket - perfect for some things but not suitable for three prong (grounded) items. In fact, I couldn't find a grounded outlet to screw into the outlet. If you're thinking of wiring the lamp socket, a ground wire could be attached to the housing, but there's no place to connect the green ground wire to the socket itself. In many cases, you only have the options of gold screw (black wire) and silver screw (white wire). Several supposed "experts" advised me to simply pull the ground pin out of whatever I wanted to connect. I reject this advice. Some tools are double insulated and only require two pins. Excellent. Others are three-prong grounded because that's how they're designed for safety. Electricity can sting or kill you. If you beat the ground with an item that comes with a three prong plug please don't do it near me. One of these handy outlets helped keep track of the electrical circuits in my house. Uses a Sperry Instruments CS550A Fuse Switch Finder Fast AC/Fuse Detect Visual LED Plug-In Transceiver with Auto Detect 80-140V Amber and Black which worked well. The circuit breaker finder did not have an adapter to connect the transmitter to a wired lamp socket. Tracking was a breeze with the plug.
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