Also be sure the neutral from the source is connected to the neutral terminal at the light. A neutral wire will not be connected to the switches in these circuits, although some smart switches may make use of a neutral wire to operate the device.
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.
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.
The wiring diagrams on this page make use of 4 way switches, between two 3 way switches, to control lights from three or more locations. A 4-way dimmer diagram is included as well as an arrangement to control the lights from four different points. Check here for 4 way switch troubleshooting and help with 3 ways switches here. For circuits that control lights from two locations only, check the wiring diagrams at this link.
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