Mains Powerboard Earth light.

Discussion in 'General Electronics Chat' started by Art, May 25, 2014.

  1. Art

    Thread Starter Distinguished Member

    Sep 10, 2007
    785
    61
    Hi Guys,
    I was wondering how the 4/6 way powerboards with earth light on them know that the earth is good?

    It's not something I need to play with, I'm just wondering how you can trust them?
    I suspect because our neutral is tied to earth at the power station,
    We could locally connect a neon between active and earth to light the neon.
    Same as if we touched an active line and our body was earthed, there would be trouble.
    Cheers, Art.
     
  2. samuel.whiskers

    Member

    Mar 17, 2014
    95
    2
    I would have thought that is what they do.... the power-socket-testers do this... take a screwdriver to one and find out! :)
     
  3. Art

    Thread Starter Distinguished Member

    Sep 10, 2007
    785
    61
    Mine is a neon, so I assume they use a pigtail neon with series resistor
    same is in the power on indicator between active and neutral.

    It wouldn't be a bad idea for some metal chassis appliances to have one.
     
  4. Metalmann

    Active Member

    Dec 8, 2012
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  5. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    The neon screwdriver testers rely on you holding the metal pocket clip or whatever for your body to complete the path to earth, if you just hold the insulated part you get no light!
    Max.
     
    Last edited: May 25, 2014
  6. Art

    Thread Starter Distinguished Member

    Sep 10, 2007
    785
    61
    I'm talking about something more permanent like this:
    http://www.jaycar.com.au/productView.asp?ID=PP4037
    I have a four way powerboard that has the "grounded" LED.
    For my powerboard it's labeled "Earthed" and I think it's a pigtail neon.

    A tester that requires you touch a conductor to earth something
    I figure it must be of enough impedance, the testing thing itself, to not hurt you.






     
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    That appears to be a standard GFI the green led indicates when a trip, if any occurs.
    Max.
     
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