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A rheostat is an extremely ancient form of variable resistor that was used very largely to vary voltage. As you mention replacing a light switch, presumably you want to install a dimmer? If so, lighting dimmers are solid state and are a simple replacement for a standard switch. NOTE - you cannot use a conventional dimmer on anything but standard incandescent lamps. They will not work on low volt, fluorescent or halogen lamps (or HID). Make sure that the circuit breaker is turned off before starting work on changing the switch out. Just for the sake of convention the top wire on your conventional switch should be the hot one. Connect this same wire to the top wire that is on your new dimmer switch. Make sure that the dimmer switch is in the off position before turning the breaker back on.

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βˆ™ 15y ago
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βˆ™ 6mo ago

To install a rheostat instead of a light switch, turn off the power to the circuit at the breaker box. Remove the existing light switch and disconnect the wires. Connect the wires to the rheostat, following the manufacturer's instructions. Mount the rheostat in place of the light switch and restore power to the circuit to test the connection.

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Q: How do you install a rheostat instead of a light switch?
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