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Thread: LED Retro fit light bulbs.

  1. #1
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    LED Retro fit light bulbs.

    Subject :LED Retro fit light bulbs.

    Two different fixtures.

    1. Standard 2' X 4' light fixture, surface or drop ceiling mounted. 2 ,3 or 4 bulbs using bi pin.
    a. T 12 older fixture requires removing ballast and possibly changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
    b. T 8 new style fixture may or may not removing ballast and changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
    c. T 5 (have seen this yet, but it must becoming sooner or later.)

    2. Standard 2 'X 2' light fixture surface or drop ceiling mounted. 2 ,3 or bulbs using bi pin.
    a. T 12 older fixture requires removing ballast and possibly changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).
    b. T 8 new style fixture requires removing ballast and changing the the bi pins to ensure separate contact points ( one Negative or Neutral the other positive or 120, or 277 volts ac).

    Important notes: Fixtures are using a ballast may be electronic or magnetic , (This limits current in the circuit.) The fixture was tested and approved by the UL with a ballast installed.
    Does removing the ballast negate the UL listing for the fixture ? Can this be done with out manufactures approval ? Should this new retro fixture be retested by UL ?
    LED Bulb manufacture is requesting the removal of the ballast (T-12 fixtures mandatory, T-8 optional ) .

    If circuit is 277 Volts AC a short in this wiring (not buffered by Ballast) may open a GFCI relay pick up in a substation draw out breaker before the local 20 amp circuit breaker opens in the distribution panel.
    Wiring ( not sure 18 awg or 20 awg) in lighting fixtures and pin sockets are now on line voltage . Is the wiring and pin sockets rated for line voltage ? Will they fail prior to over current 20 amp CB opening ?
    Should a inline fuse by used in the fixture (after the quick disconnect) to protect the fixture wiring and pin sockets ? If so what size ?

    Ears open

    Cheers

    Thomas

  2. #2
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    Quote Originally Posted by philem47 View Post
    Does removing the ballast negate the UL listing for the fixture ?
    Should this new retro fixture be retested by UL ?
    Thomas: Luminaire retrofit kits are currently Classified under the
    Luminaire Conversions, Retrofit (IEUQ) product category.
    You might find this an interesting read:
    https://www.ul.com/wp-content/upload...trofitKits.pdf

    Quote Originally Posted by philem47 View Post
    Can this be done with out manufactures approval ?
    Yes if the kit is UL classified

    Quote Originally Posted by philem47 View Post
    Is the wiring and pin sockets rated for line voltage ?
    Yes, however the amperage and available fault current may not have been considered when used without a ballast that ultimately limits the current.

    Quote Originally Posted by philem47 View Post
    Will they fail prior to over current 20 amp CB opening ?
    Should a inline fuse by used in the fixture (after the quick disconnect) to protect the fixture wiring and pin sockets ? If so what size ?
    I also wonder about these questions, It is a good idea to install a inline fuse I dont think anything prevents you from installing a line fuse even if a retro fit does not come with one.

    Cheers

  3. #3
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    Why would you need a fuse or .... Edison base fixtures don't

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