Wiring Diagrams for Multiple Wall Outlets
–Check local regulations for restrictions and permit requirements before beginning electrical work–
This page contains several diagrams for 2 or more receptacle outlets wired in series and parallel. Wiring for multiple ground fault circuit interrupters (gfci) and standard duplex receptacles are included with protected and non-protected arrangements.
Wiring Multiple Outlets in Series
To wire wall outlets in series, the terminal screws are used to pass voltage from one receptacle to the next. In this diagram, multiple receptacles are connected together using the device, instead of a pigtail splice as shown in the next diagram. Because the wiring is in series, any break or malfunction at one outlet will cause all outlets that follow to fail as well.
Wiring Multiple Outlets in Parallel
This diagram shows the wiring for multiple receptacles in a parallel arrangement. All wires are spliced to a pigtail which is connected to each device. This wiring allows for voltage at each device independent of the other outlets in the circuit.
Double Receptacle Circuit
Here 3-wire cable is run from a double-pole circuit breaker and split to supply 120 volts to two sets of receptacles. The neutral wire from the circuit is shared by both. This wiring is commonly used in a 20amp kitchen circuit where two appliance feeds are needed, such as for a refrigerator and a microwave in the same location.
Ground Fault Circuit Interrupters in Parallel
In this diagram multiple gfci receptacles are wired together in a parallel arrangement. Two-conductor cable is run between gfci's, and the hot, neutral and ground wires from the source are spliced with a pigtail to the line terminals at each device. The load terminals are not used and each device provides its own, single-location protection.
Double GFCI Receptacles
Here GFCI's are wired to a double-pole circuit breaker with the source split to provide 120 volts to two sets of receptacles. The neutral from the source is shared by both sets. Single-location protection is provided by each receptacle.
Multiple Duplex Receptacles and a GFCI
Here a gfci receptacle is added at the end of a row of duplex receptacles for single-location protection. The first outlet is connected to the source and 2-wire cable runs from box to box. All wires are spliced at the devices to pass current from one to the next. The load terminals on the gfci are not used and it does not protect the other receptacles in the circuit.
GFCI to Protect Multiple Duplex Receptacles
Here one ground fault circuit interrupter protects multiple duplex receptacles coming after it, known as multiple-location protection. Two-wire cable runs from the gfci to all the following receptacles. The line terminals on the gfci are connected to the circuit source and the load terminals are connected with a pigtail splice to each of the following receptacles to join them in parallel. This keeps each duplex connected directly to the gfci.