Locate the circuit breaker or fuse that controls the outlet you plan to replace and shut off the power to the circuit. Plug a lamp, radio or the GFCI tester into the outlet to test for power and make ...

The first U.S. detachable electric plug was patented by Harvey Hubbell II in 1904 and was among many of Hubbell's contributions to the field. But it would take a few decades before a standardized ...