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ANSI adoption of UL1838 Standards

Discussion in 'Landscape Lighting' started by INTEGRA Bespoke Lighting, Feb 6, 2008.

  1. INTEGRA Bespoke Lighting

    INTEGRA Bespoke Lighting LawnSite Platinum Member
    Messages: 4,102

    Does anyone know what is going on with ANSI and UL? I have heard something about ANSI adopting UL1838 standards for LV outdoor lighting. I have no further details.

    If this is the case, will it result in UL1838 being written into the NEC as ANSI is the administrating body of the NEC.
  2. Eden Lights

    Eden Lights LawnSite Senior Member
    Messages: 805

    Joe over at lowvolt can update you on this, he may have even already made a post on the topic. I know he made a post on how the groups interact.
  3. steveparrott

    steveparrott LawnSite Bronze Member
    Messages: 1,276

    I asked the same question on the other forum. Joe didn't have a definite answer. It would be good for someone to track this however. Changes to the NEC happen slowly and there is a very intensive review process that takes years. There are opportunities to weigh in on proposed NEC changes. I don't know what these are but the folks at the mikeholt.com forum are the experts.
  4. ChampionLS

    ChampionLS LawnSite Bronze Member
    Messages: 1,066

    The standards for Low Voltage Landscape Lighting Systems, UL1838, and
    Low Voltage Lighting Systems, UL 2108, provide for the low voltage output
    circuit of the luminaire power supply to be rated up to and including 25
    amperes. Note that the standards specify “rated” rather than “limited to”. A
    hypothetical power supply that is somehow designed to deenergize the output
    circuit when the output current exceeds 25 amperes for any (hence arbitrarily
    small) amount of time would need an output circuit rated much lower than 25
    amperes to prevent tripping of the overcurrent protection device when operated
    at full rated load until temperature stabilization.
    To address the risks of fire resulting from excess output current, UL 1838 and
    UL 2108 require the power supply to deenergize the output circuit within one
    hour when the circuit is loaded at 135 percent of 25 amperes. This load and 1
    hour period match the load and one hour period of one of the tests required for
    a 25 ampere circuit breaker in the standard for Molded Case Circuit breakers,
    UL 489. It is proposed that 411.2 be revised to require that output circuits
    be rated not more than 25 amperes (rather than an undefined “limited to”),
    with the awareness that requiring the low voltage luminaire power supply
    or the entire lighting system to be listed using the above specified standards
    inherently requires the power supply to limit the output current as defined in
    the standards.
    Panel Meeting Action: Accept
    Number Eligible to Vote: 13
    Ballot Results: Affirmative: 13
    18-106 Log #2712 NEC-P18 Final Action: Accept

    Taken from this source:

    Attached Files:

  5. INTEGRA Bespoke Lighting

    INTEGRA Bespoke Lighting LawnSite Platinum Member
    Messages: 4,102

    Wow not much feedback on this issue. Not here, not on the other forums...

    This has the potential of being a huge move. I wish I could find out more about what is going on.

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