This is the standard 15 amp 120 volt wall receptacle outlet wiring diagram. This is a polarized device. The long slot on the left is the neutral contact and the short slot is the hot contact. A grounded contact at the bottom, center is crescent shaped. Don’t use this receptacle when no ground wire is available.
This is an older version of the receptacle in the first diagram. The slots are different sizes to accept polarized plugs, but it lacks a grounding slot. This device does not make use of a ground wire. There is no protection against electrocution as provide by the grounded receptacle.
The top terminal is connected to the black cable wire, and the source neutral is spliced to the white wire which continues on to one of the neutral terminals on the receptacle, it doesn’t matter which, only one connection is needed with the neutral wire.
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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