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Wiring a PIR light

Discussion in 'Do It Yourself (Not Computer-Related)' started by nichos, Jan 30, 2019.

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  1. nichos

    nichos Thread Starter

    Joined:
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    Light Scan.jpg L. SCAN2.jpg Hi,

    The PIR Light on the garden gate worked for 10 years OK, now has failed, the light bulb is OK, so I opened the wiring box to check for any loose cables & noticed this, in my mind, peculiar wiring as per left scan below showing the bulb common wiring going to Earth.

    Although not a trained electrician but an aviation mechanic I rewired it with common sense as scan right & it works OK. Sorry for the unprofessional pictorial drawings.

    My question is why did it work all these years, or am I wrong & this is how it should be wired & the fault was elsewhere? .........thanx
     
    Last edited: Jan 30, 2019
  2. mole

    mole

    Joined:
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    Messages:
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    Can't say why it would have been wired to Earth ground in the first place, but your modifications after it stopped working and fact it does work now suggest maybe the path to ground had failed.
     
  3. nichos

    nichos Thread Starter

    Joined:
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    Thanx Mole,

    I checked continuity now & the earth is OK ???!!!
    Strange though, must be jinx.

    In the summer I'll check the other 2 gate lights.
     
  4. mole

    mole

    Joined:
    Aug 24, 1999
    Messages:
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    Strange. Any of those outdoor electrical scenarios can be subject to moisture and temperature changes playing with connections. Of course the wires feeding the system have to be appropriate for that too, "UF". I have seen moisture infiltration, insect nests and rodent chewing all mess with outdoor wiring causing the behavior you are experiencing while at the same time other stuff outside for 50 years works fine. For some outdoor fixtures the act of checking them seems to cause the darn thing to work again. See if you can find a manufacturers wiring diagram for the lighting unit on-line and compare versus what you have now/had before with that ground wiring as it seems suspect to me in the first place. Check the obvious things, damaged wires, tighten connections, make use of multi-meter. Of course these things only happen when the weather makes working on them less than pleasant. Good luck.
     
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