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OK, so you understand how to add a 120 volt circuit, but how about a 240 volt circuit? A lot of people feel uncomfortable opening up an electrical service panel and adding a 240 volt circuit or get confused by how these circuits are wired.

Well, you're not going to be one of them. Adding a 240 volt circuit is as easy as adding a 120 volt circuit, actually it can be easier. In the tutorial, Installing a 240 Volt Circuit Breaker, I'll lead you step by step with detailed photos through the procedure for adding a 240 volt circuit and receptacle that uses 3 wires (2 hot and 1 ground).

Some 240 volt plugs are designed for 120/240 volts and those circuits and receptacles use 4 wires (2 hot, 1 neutral and 1 ground). This tutorial is for installing a straight 240 volt circuit and receptacle and it requires 3 wires (no neutral wire). But I talk about the difference between these circuit types and how the wiring process is similar for both. So take a read thought this tutorial, it's electrifying!


November 29, 2007 at 8:13 pm
(1) Ray says:

Where did you get the information that a line voltage thermostat for a resistant type heater? The thermostat does not vary the voltage. It shuts the electricity off or on when the setting is reached. I think lowering the voltage would drive the current up as the resistance is constant. this would burn up the wire is sized on the resistance and 240v.

November 29, 2007 at 11:25 pm
(2) homerepair says:

I said line voltage thermostats control electrical resistance heating systems which is correct. And you are correct, most line voltage thermostats simply turn power on and off to the resistance heater (through use of a bimetallic strip) when a temperature is reached. However, with Electronic Line Voltage Thermostats (ELVTs), semiconductors control current to the heater and allow the resistance heater to run at a percentage of its total capacity, similar to the function of a light dimmer. You can set the heater to a level less than 100% output, say 60%.

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