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Some work must be done by licensed Professionals and work must be inspected by a local municipal or county or state inspectors.
Test the wires for power using the circuit tester the tester should not glow if it does shut the power off to the correct circuit at the main service panel.
Installing a receptacle
A 125-volt receptacle can be wired to the electrical system in a number of
ways. Wiring configurations may vary slightly, depending on the kind of
receptacle used, the type of cable, or the technique of the electrician who
installed the wiring. To make dependable repairs or replacements, use masking
tape and label each wire according to its location on the terminals of the
existing receptacle.
Receptacles are wired as either end-of-run or middle-of-run. These two basic
configurations are easily identified by counting the number of cables entering
the receptacle box. End-of-run wiring has only one cable, indicating that the
circuit ends. Middle-of-run wiring has two cables, indicating that the circuit
continues on to other receptacles, switches, or fixtures.
When working with split-circuit receptacles. Each half of a split-circuit
receptacle is wired to a separate circuit. This allows two appliances of high
wattage/amperage to be plugged into the same receptacle without blowing a fuse or
tripping a breaker. This wiring configuration is similar to a receptacle that is
controlled by a wall switch. Code requires a switch-controlled receptacle in any
room that does not have a built-in light fixture operated by a wall switch.
Split-circuit and switch-controlled receptacles are connected to two hot wires,
so use caution during repairs or replacements. Make sure the connecting tab
between the hot screw terminals is removed.
Two-slot receptacles are common in older homes. There is no grounding wire
attached to the receptacle, but the box may be grounded with armored cable or
conduit.