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Thread: Photocell load rating ...

  1. #1
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    Photocell load rating ...

    Hi.. Installed 3 low voltage landscape transformers which I would like have energized via a photo cell. They total 600 watts and have toroidal cores.
    I went through the photocells at the supply house and of all the manufacturers and VA, they all seam to say rated for tungsten and ballast loads..
    Should these tungsten-ballast rated photocells be ok to operate an inductive load??

    Thank you
    " I'm at a crucial part of my painting "...........Monika Danneman

  2. #2
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    The problem, if there is one, will not be because of the inductive load but rather the inrush caused by core saturation and hysteresis when the applied voltage has a random phase at the point the switch closes. As long as there is a load on the transformer, there will not be a large voltage surge on the primary contacts on opening.

  3. #3
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    Wow !! Ok. Thank you. In it goes.
    " I'm at a crucial part of my painting "...........Monika Danneman

  4. #4
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    If it doesn't last, you could cascade with the photocell controlling a contactor.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  5. #5
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    My original thought was a contactor then i thought if the photo cell would handle it why not just the photo cell.... I would probably install a timer with the photo cell to have it turn off at some designated time rather than having the lights on all night.
    Now I'm considering this Honeywell timer... I think it can be set for dusk and a set time off that will adjust itself for daylight savings time so it doesn't have to be adjusted twice a year. It also looks like it's rated for the load...

    I HATE programing these timers, but I think it may be a good way to go...

    Please confirm..

    https://www.supplyhouse.com/Honeywel...18e014b2131bc6

    Thank you
    " I'm at a crucial part of my painting "...........Monika Danneman

  6. #6
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    I've programmed enough of them that I can do it without the instructions.


    I don't know whether I'm bragging or complaining.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  7. #7
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    If you are leaning towards timer if you haven't already check this one out. This is one of many in the Leviton line of wifi timer switches an dimmers.
    Leviton R01-DW15S-1RZ.

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