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Old 12-30-2008, 05:42 PM   #1
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Single-pole 220V Switching


I bought a themostat for a new 220V baseboard heater. The thermostat is from Honeywell as is the heater, and noted "110V or 220V." I am curious how it breaks only one hot leg, and not both. (thus, single-pole)
Doesn't this leave one hot, unswitched wire at the appliance? Why wouldn't the heater work with the one hot, unswitched leg?

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Old 12-30-2008, 05:46 PM   #2
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Single-pole 220V Switching


It does leave an unswitched hot, but it interrupts the other hot leg so the 240V circuit is not complete.

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Old 12-31-2008, 12:50 PM   #3
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Single-pole 220V Switching


And yes, you can get shocked if you open the heater connection box without turning off the breaker. One leg will always be hot at the heater.

A 240 volt appliance needs both wires to complete the circuit. The thermostat only opens one wire. It is due to the manufacturer that made the T-Stat. It's much cheaper to build with one contact than with two.
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