If there is no continuity the switch has failed and needs to be replaced. Connect the switch as you would with a simple switch handling each pole separately.
Single Pole Double Throw Wiring Diagram H1 Wiring Diagram
How to test a double pole switch. On a single pole breaker they will test to see if the meter reads 120 volts. This circuit breaker must be of the same or lower amperage as the circuit breaker that is tripping never greater. Attach the main blue terminal to one of the poles on the side attach the main brown termainl to the pole right next to it. Thus a double pole switch has three terminals. If you do youre in for a bit of a jolt. Turn off power to the switch at the circuit breaker.
Using a continuity tester on the terminals see if there is continuity when the switch is turned on. Double switch test and replacement for bath fan and light in a 1960 house duration. Shut off the power. Sparky channel 6417 views. Disconnect the wires from one of the 220 volt circuit breakers that is working correctly. Shut off the power to the light switch circuit by switching off the appropriate breaker in your homes service panel breaker.
Your time will be well spent double checking your work. A low reading or zero indicates a bad breaker. If the electrician identifies a bad breaker theyll replace it and to determine what led to its failure. Touch one prong to the terminal screw on the breaker and the other to the ground. The other two terminals are often referred to as a and b. For one thing both supply wires for this switch carry voltage.
Likewise on the double pole breaker theyll test for a reading of 240 volts. When the switch is in one position the common terminal is connected to the a terminal so current flows from the common terminal to the a terminal but no. Cap wires as needed. Connect the disconnected wires from the tripping circuit breaker to the second circuit breaker. With both conductors carrying 120 volts there is an increased risk of injury or property damage. Unscrew the switch mounting screws and pull the switch out of the box enough to access the switch terminals.
Make sure that there are no cross connections between the two poles. Touch one prong to the terminal screw on the breaker and the other to the ground. Wiring a 20 amp 240 volt switch can be a confusing experience for the average homeowner used to working with standard 110 volt circuits. Identify the switch type. If you decide to use a voltage tester dont touch a bare wire or the neutral as youre testing. Attach the blue jumper connector to the opposite corner and the brown jumper to the other corner to form an x across the switch.
Disconnect and remove the switch. The switch wires do not need to be disconnected at this time. This switch doesnt use a neutral conductor. This kind of mistake is easy to make and potentially very dangerous depending on the application. One of the terminals is called the common terminal. A double throw switch connects an input terminal to one of two output terminals.
Gallery of How To Test A Double Pole Switch
