Electrical – Indicator light on electrical switch

electricalheatingswitch

I just moved in to a house with roof heating cables. The outlet it is connected to in the garage has an indicator light which comes on in the down position. The indicator light is off when the switch is in the up position. Am I correct to assume I leave the switch up when I do not want the cables to work, and that the indicator light will show me in the down position that the heating cables are on?

Best Answer

There are switches with indicator lights that illuminate when on and other switches that illuminate when off. The former are called pilot lights, the latter, illuminated switches.

To determine which yours is, you need to look at the switch without the cover plate and determine which position is ON. While up is the convention for a single pole switch that is completing a circuit, it doesn't really mean anything, since a switch can be mounted upside down.

Most single pole switches have an up indication stamped on the metal mounting frame. If that is positioned up, the switch is connected when the paddle is up.

If there is no indication, you will need a circuit tester to determine which position completes the circuit.