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Thread: Lamp post photocell hook up

  1. #1
    DIY Junior Member mr fix it's Avatar
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    Default Lamp post photocell hook up

    Hi: Question, I am hooking up a new outside lamp post with photocell dusk to dawn. I will not be hooking it up to electric supply till sometime next spring. Just putting everything together now. I am using conductivity meter to check wiring, everything seems to check out ok except I can not get a conductivity reading acrossed the photocell. I have reading going into cell black wire to black wire but no reading coming out the red wire to light
    I tried covering the cell with black tape and also after dark. Is it possible that conductivity can't be read acrossed a photocell??? Or does the photocell have to be exposed to the light for a day ??? I just took it out of the box. Thanks for any help.

  2. #2

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    Photocells and the like are "electronic circuits" which need to be powered to function.

    And if there are any "diodes" (electronic component) in these electronic circuits, these would need a certain "voltage" (7/10 volt) and a certain "polarity" of voltage to get a reading on a testing device. Some testing devices do not provide this high of a voltage through the test wires.

    In English: Just follow directions, hook it up, and see if it works!

  3. #3
    Homeowner Thatguy's Avatar
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    Quote Originally Posted by mr fix it View Post
    I can not get a conductivity reading acrossed the photocell.
    A CdS photocell in bright light should read low (~10k?) resistance.

  4. #4
    DIY Junior Member mr fix it's Avatar
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    Thanks Billy Bob. That thought did enter my mind. Looks like I will need to power it up to see if it works. many thanks again for the help.

  5. #5
    DIY Junior Member mr fix it's Avatar
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    Thanks guy, everyone has been a big help. Nice to have the experts to take your problems too.

  6. #6

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    The PV power from a 3 wire photo cell opens the circuit.

    When you first install and power up a 3 wire photo cell, the light will be on for about 20/30 seconds.

    It seems like you should have continuity between black and red (of the PC) right out of the box
    Last edited by 220/221; 11-17-2009 at 04:20 PM.

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