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INTEGRA Bespoke Lighting
02-06-2008, 08:42 AM
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.

Eden Lights
02-06-2008, 11:29 AM
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.

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.

steveparrott
02-06-2008, 01:09 PM
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.

ChampionLS
02-06-2008, 01:59 PM
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:

INTEGRA Bespoke Lighting
02-07-2008, 01:14 AM
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.