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Fluorescent Light - proper voltage

Discussion in 'Electrical Engineering' started by David McCarroll, Oct 29, 2004.

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  1. I have a fluorescnet light fixed in a new industrial paint booth
    application. The data plate says 277 VAC .43AMP 110VAC .9AMP. On the
    system I have 480V 3phae 60Hz with a neutral. When I measure from one
    phase to neutral I get ~270V. If I hook one phase and neutral to the
    balast wiring will this give me the proper voltage that is needed to
    operate the light fixture? I do not have 110VAC available, with out
    running new wires.
    Any help with this would be greatly appriciated.
  2. 270 V should be well within its operating range. The fact that you are
    asking this question causes me a little concern that perhaps you are not
    qualified to perform the work.

    Charles Perry P.E.
  3. SQLit

    SQLit Guest

    Take a break here..

    I have been in the "bus" for 35 years and have NEVER seen and dual voltage
    fluorescent ballast. I am not saying that they do not make it I have never
    seen one. HID fixtures all of the time. HID's are usually not used on spray
    There should be some red,blue wires going to the ends of the lamps. If this
    ballast really has two transformers in it. Then there should be 2 sets of
    line wires for the ballast.

    If you get on the wrong set of input wires, you will let the magic (smoke)
    277 is nothing to play with. It flat hurts when you get hit. Please consult
    a electrician locally before possibly making an huge mistake.

    Please provide the manufacture and model number for this ballast, so I can
    learn something new. Thanks
  4. David

    David Guest

    Thank you for the information. Yes, I probably am not the most qualified
    person to tackle this. My part of the system was to program and control the
    spray guns used to apply the coating to the product. However, the licensed
    electrician was not sure either. I was just trying to use an available
    resource for the answer.

    Thank you,

  5. David

    David Guest

    I had never heard of this before either. Thanks for your input. I will
    make sure, that is one thing I'm trying to do now, before I connect any
    wires. I have worked with 480 V 3 phase before, just never used one phase
    of it with a neutral for anything. So was just trying to make sure, and
    ask someone who might know a little more than me.

    Next time I am out on site I will get all the specific information from the
    ballast and post it. Thanks again for your input.

  6. David

    David Guest

    Thank you for the information. I am getting power from a newly installed
    sub-panel from an 80 AMP breaker that is feeding a control enclosure
    through a 60 AMP fused disconnect. In the enclosure there is a
    distribution block, I would be picking up one phase from the distribution
    block and neutral from the neutral bar installed in the control enclosure.
    This is all new wiring. I've worked with 480 V 3 phase power before going
    to motors and such, but that was using all three phases, I have never used
    1 phase and a neutral. I was just trying to verify with those who probably
    know more than I, before hooking anything up. Again thank you for the
    questions, give somethings to check.

  7. JohnR

    JohnR Guest

    277V is common for industrial/commercial lighting. As you have found, it is
    the Phase to neutral of a 3 phase 480 volt system. The licensed electrician
    did not know this?
  8. David

    David Guest

    I was surprised by this myself. I don't know why he didn't seem to know
    this or why he hadn't thought about it. Anyway, thanks for the info.

  9. uray

    uray Guest

    I've seen a lot of dual voltage ballasts. There are generally 3 input wires,
    the voltage select wires usually have a stickers with either 120 or 277
    printed on it. Use the one you need, insulate the one you don't.

    Handy to stock them if your facility has both voltages, keeps inventory down
    although the unit cost is usually a little higher.
  10. uray

    uray Guest

    I'm not surprised. I've had one who couldn't figure out a machines required
    supply voltage (240 or 480) while staring right at the control transformers
    input taps.
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