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Thread: Fixtures Per Circuit

  1. #1
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    Fixtures Per Circuit

    How many of these drivers could I put on a 120v circuit or would be a practical design? It says 5-40w driver? How would I calculate that per 120v 20a circuit. About 1 amp per 100watts? Watts to amps? Thanks,

    http://www.lutron.com/TechnicalDocum...40_LED_4.8.pdf

  2. #2
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    Input is .51A. Do the math....
    Moderator-Washington State
    Ancora Imparo

  3. #3
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    Quote Originally Posted by tom baker View Post
    Input is .51A. Do the math....
    Ok Im not 100% clear. Your taking that pic from the pic of the ballast correct? So would I say ok 80% of 20A and divide that by .51? SO about 33 fixtures on 1 20A circuit? Seems like a lot.

  4. #4
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    As Tom stated the driver input current is .51 amps @120 volts so forget the watts/amps. Your calculation appears correct.
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

  5. #5
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    Quote Originally Posted by mstrlucky74 View Post
    ...Seems like a lot.
    Welcome to the LED world!

  6. #6
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    Quote Originally Posted by infinity View Post
    As Tom stated the driver input current is .51 amps @120 volts so forget the watts/amps. Your calculation appears correct.
    Thanks

  7. #7
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    Quote Originally Posted by MAC702 View Post
    Welcome to the LED world!
    lol.

  8. #8
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    I checked your numbers and get 31 drivers.
    20 amps * 80% = 16 amps
    31*.51 amps = 15.8 amps
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

  9. #9
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    Quote Originally Posted by infinity View Post
    I checked your numbers and get 31 drivers.
    20 amps * 80% = 16 amps
    31*.51 amps = 15.8 amps
    TY

  10. #10
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    171011-1256 EDT

    You really need to know more about the driver to determine if it is advisable to put that many on the circuit.

    .

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