Curious about the T-shaped hole in some electrical outlets? Learn what it means, what plugs it supports, and why it’s used in ...

Ground-fault circuit interrupter (GFCI) and arc-fault circuit interrupter (AFCI) receptacles have terminals called LINE and LOAD. The line side brings power to the GFCI or AFCI receptacle ...

Consult your local electrical code authority for specifics. Both AFCI and GFCI protection can be provided by breakers or ...