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You would need a 20 amp switch when the load controlled by the switch can draw as much as 20 amps. If you have a 20 Amp breaker supplying the circuit then you need to size all switches and outlets on that circuit to 20 amps.

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โˆ™ 2010-05-18 11:22:07
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Q: Why would i need a 20-Amp Single-Pole Switch insted of a 15 Amp?
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Why would you need a 20 Amp Single Pole Switch insted of a 15 Amp?

If the wire to the switch is AWG #12 you need a 20 amp switch because it is a 20 amp circuit.


Is it advisable to use a 30 A fuse in circuit that is rated to carry only 20 A?

No, the fuse must be rated lower. If a 30amp fuse is used on a circuit rated as 20amp, the cables would heat in the case of a short, before the fuse would blow and switch off the circuit - leaving a fire hazard.


What effect would occur if the intermediate switch were replace by a double pole switch?

The system would not switch the light on.


Why would one outlet have 40 volts insted of 120 volts?

You probably have a loose connection in the neutral wire SOMEWHERE in the circuit.


Adding a 240 volt 20amp electric heater in my crawl space Would like to use my 20 amp circuit for outside condenser Both would never be on at the same time Do they make a switch for this?

Yes, what you are looking for is a double pole double throw switch. The center lugs are connected to the incoming line. Then the top lugs could be connected to the electric heater and the bottom lugs connected to the condenser. The trouble lies in finding a switch with a rating of 20 amps. These types of switches are usually used with a stand-by generator and rated at 100A and greater. Think I remember seeing one at 60A once. You might want to think of using a DPDT relay rated at 30A with a 120 volt coil. With a switch to operate it the relay. Depends in what part of the country you live, long winters switch off for heater, long summers switch off for conderser.

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