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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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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.


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.


Can you put a 20amp water pump and a 30 amp water heater on a 50amp breaker?

No, they each need their own breaker of the right amp. Neither of them would cause the breaker to trip if there was a problem.


What position does the switch have to be in for a circuit to work?

The switch would be open.


What alteration would occur if a single pole switch is reconnected to become a master switch?

If a single pole switch is wired to be a master switch, the switch would have to be in the on position for any other control devices to operate. Turning the master switch off would eliminate power to all devices (and/or loads) which it was serving. For example, some homes have a switch to control their outside light. If the outside light has a photo eye (the light will only come on at night), the switch is the master switch. Another example would be the breakers in an electrical panel. Each breaker would be the "master switch" for the circuit it protects. The main breaker in the panel would be the "master switch" for the entire home.