This is the oldest version of a wall receptacle that you will find. It lacks a grounding contact and the plug slots are both the same size. These devices did not make use of a ground wire and both plug slots were treated the same. The wires used with these receptacles were usually both black.
At the beginning of the circuit the hot source is connected to the common terminal on SW1. The neutral is spliced to the white cable wire and then spliced to the neutral terminal at L1, along with the white 2-cable wire running to L2 where it connects to the neutral terminal.
When using this device for heavy appliances like washing machines and microwaves, it should be connected to a dedicated 20-amp/120-volt circuit breaker. As of 2014, a GFCI receptacle is now required in a laundry room for the washing machine.
This diagram illustrates wiring for one switch to control multiple lights. The source is at SW1 and 2-conductor cable runs from there to the fixtures. The hot and neutral terminals on each fixture are spliced with a pigtail to the circuit wires which then continue on to the next light. This is the simplest arrangement for more than one light on a single switch.
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