2 Pole Light Switch. A single-pole switch has two brass-colored screw terminals that are connected to the hot, or power-source, wires. A double pole light switch has two sets of two screws one pair on each side of the switch.
Homeowners may choose to replace or upgrade a light switch for functional or for aesthetic reasons.
A common application of a switch is to turn the room lights on or off.
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If you have one light switch that turns your light on and off, then that's a single-pole light switch. These switches have no on/off markings because the on and. Two separate circuits are controlled by one switch.