The mundane world of GFCIs and using the proper-size light bulb in your light fixtures just scratches the surface of electrical safety. Its importance is heightened when you do any repairs or alterations to your system. It’s like the difference between swimming in the shallow end of the pool and jumping into the deep end with the big kids. Unlike the big kids, who literally sink or swim based on their skill level, you can stack the deck in your favor with a few preemptive moves.
The number-one, top-of-the-list safety rule in electrical work is this: Make sure the current is off, and if it isn’t, shut it off! After the power is off, any fumbling with the wires will be a forgiving experience instead of a highly charged one. An inexpensive voltage tester can tell you in seconds whether a current is hot.
Plugging a tool or a light into a receptacle is not an adequate way to test whether a circuit is on. The receptacle might be defective. Always test the conducting wires themselves with your voltage tester.
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