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The s given below are ONLY for USA, Canada and countries using similar 120/240 Volt, 60 Hz mains power supply systems.If the box has 3 wires at 220V you can't get 110V. The reason is you have the two hots and the ground, but not the neutral. If you pull a neutral through the conduit or re-run the *-2 wire with *-3 you can get 110V at this panel.

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However, if you no longer want 220V at this fixture you can derate it to 110V. The key here is the current capacity of the old wire. You cannot exceede the current capacity of the wire as that is a fire hazard. Also the fixture must be on a dedicated circuit. You cannot mix 110 and 220, you have to derate the whole circuit. To derate:

  • Get a 110V fixture of equal or lesser current to the old one that you want to use.
  • Get a 110V appropriately sized for your fixture.
  • Remove the 220V breaker and replace it with the 110V breaker. The white wire that went to the breaker now goes to your neutral bus.
  • Replace the 220V fixture with the 120V.

Always, if you are not 100% sure of what you are doing, buy a book. It will answer your questions and serve as a handy reference during the job. Do it right or hire a professional. Negligence is fatal with electricity.IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

If you do this work yourself, always turn off the power

at the breaker box/fuse panel BEFORE you attempt to do any work AND

always use an electrician's test meter having metal-tipped probes

(not a simple proximity voltage indicator)

to insure the circuit is, in fact, de-energized.

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โˆ™ 2015-07-15 20:55:21
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Q: How do you get 120V from a single circuit breaker box that has a 240V line coming into the box that has one black one white and one bare line?
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