When replacing an ungrounded, polarized receptacle use this type and not the grounded type above, unless it is grounded by a jumper wire to a metal outlet box that is tied to the house service panel ground through a continuos metal conduit.
In this basic 4 way light circuit the source is at the first switch and the hot connects to the common on that switch. Three-wire cable runs between all the switches and the traveler wires are connected between the two 3-ways and the 4-way. Two-wire cable runs from the last switch to the light fixture and the common on that switch connects to the hot terminal on the light.
This represents a change in the NEC code that requires a neutral wire in most new switch boxes. If you are running a new circuit check the electrical code to understand this and any other updates to the required procedure.
With this wiring, both the black and white wires are used to carry 120 volts each and the white wire is wrapped with electrical tape to label it hot. This circuit doesn’t make use of a neutral wire and the ground wire is connected to the ground terminal on the device. The slots are configured to accept only plugs from compatible appliances.
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