240-Volt Circuit Basics
A pure 240-volt circuit is categorically different than a 120-volt circuit.
Some 240-volt circuits, however, are described as 120/240-volt circuits.
For example, don’t attempt to install a Square D breaker in an Eaton electrical panel.
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This project may also require a building permit, depending on the rules in your area.
You’re required to follow local regulations, even as a DIYer.
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Never touch these conductors or terminals while working in the panel.
Turn off the power to the panel’s breakers and hot bus bars by switching off the main breaker.
If you detect any voltage at any breaker, call an electrician for help.
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These have power at all times unless the utility company shuts down your service feed.
Remove two adjacent knockout tabs for the new double-pole breaker, as needed.
If you are installing a 120/240-volt circuit, also strip the insulated white (neutral) wire.
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Connect only one wire per terminal.
Check for a Proper Fit
Confirm that the breaker is secure and completely snapped into place.
It should be flush with the other breakers in the panel.
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Now, connect the neutral circuit wire.
Reinstall the dead front cover and the door on the service panel.
Switch on the main breaker to restore power, and test the new circuit for proper operation.
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These breakers have an attached coiled white pigtail wire.
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The Spruce / Kevin Norris
