In this diagram the source for the circuit is at the light fixture and the two switches come after. Two-wire cable runs from the light, to SW1 and 3-wire cable runs between SW1 and SW2. The hot source is spliced to the white cable-wire, which is wrapped with black tape to mark it as hot and run through to SW1 where it is spliced to the black wire running to the common terminal on SW2. The hot terminal on the light fixture is connected to the common terminal on SW1. The red wire and marked white wire travelers connect the traveler terminals between the two switches.
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.
Instead of terminals, a 3 way dimmer has 4 wires coming out of the casing: one common, two travelers and one ground wire. The common wire is usually black and the travelers red. In any case, the traveler wires will usually be the same color to distinguish them from the common wire.
This diagram illustrates the wiring for a split receptacle with the top half controlled by SW1 and the bottom half always hot. The receptacle is split by breaking the connecting tab between the two, brass colored terminals. The tab between the neutral, silver terminals should remain intact.
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