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Thread: UL relays

  1. #21
    Join Date
    Jul 2006
    Location
    San Francisco Bay Area, CA, USA
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    7,161
    Quote Originally Posted by Open Neutral View Post
    Thanks. Square D insists any NC/DT contactor is a safety hazard, assuming I guess that everything is a motor starter.
    They do offer the LC1D80008-B7 2xNO, 2xNC, for ~~$500

    Eaton has nothing.
    The ABB one I looked at was $330 list
    __________________________________________________ ____________________________
    Many people are shocked when they discover I am not a good electrician...

  2. #22
    Join Date
    May 2010
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    Inside the Beltway
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    621
    > $330

    I'm in conversations with a smaller company; they may be able to fill the need.

  3. #23
    Join Date
    May 2010
    Location
    Inside the Beltway
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    621

    UL low voltage relevence

    Quote Originally Posted by augie47 View Post
    "Approval" of equipment is up to the AHJ.
    The AHJ may well take into account any listing by a NRTL such as UL in determining his approval.
    Revisiting this, the panel construction shall be done by a panel builder or the jobsite electrician. The sole components will be the Struthers-Dunn 450-seres 24 VAC coil, UL-relays, Square-D contactors, DIN rail, and wires. Those relays do switch line voltage.

    Those relay coils are being controlled by a separate control box, one with no line voltage within it; it runs on my kind of supply voltages: 24VDC, 5VDC, and even 3.3VDC, if you count the processor buss....

    Internal relays switch the external 24VAC to run the aforementioned relays in the separate box. There's an adjacent UL-labeled 2.5A float charger that will float the control box batteries.

    So what if anything does UL have to do with that control box? What little I know is superficial: I always thought that if it fit under Class II (as I believe it does...), that was good enough.

    One electrician says the box "Must meet UL..." but it's not clear what his basis it. The PE signing off on the project has not yet addressed this specifically, but included it in all the plans to date. (We're seeking an audience.....)

    What comments do the Wise Men here have to offer?

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