LIGHTING CONTROLS

3-WAY SWITCH

3-WAY SWITCH

It is a lighting control that can turn “off” or turn “on” a lighting fixture in two different locations. It is called a 3-way switch because there are 3 conductors connecting the switches.

3-WAY SWITCH MATERIALS

2 Pcs SPDT switch1 lamp holder/outlet1 lighting fixture/bulbWires2 Pcs Utility Box

3-WAY SWITCH DIAGRAM

SPDT SWITCH BSPDT SWITCH A

Lighting Bulb

Conductor

Return Line

Live Side

3-WAY SWITCH OPERATION

• The operation of a 3-way switch is very simple:When the two switches are in the same

position –both in position 1 or both in position 2 – the bulb is “off”.

When the two switches are in opposite or unlike positions – switch A in position 1 and switch B in position 2 ; or switch A in position 2 and switch B in position 1 – the bulb will turn “on”.

SWITCH POSITIONS

Position 1 Position 2

Sw A in position 1; Sw B in position 1Bulb is “Off”

SW A in position 2; Sw B in position 2Bulb is “Off”

Sw A in position 1; Sw B in position 2Bulb is “On”

Sw A in position 2; Sw B in position Bulb is “On”

Circuit Realization

CIRCUIT REALIZATION