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PMK

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Posts posted by PMK

  1. 100's if not 1000's of people die every year *accidentally* from CO poisoning from either car exhaust or charcoal burners being used inside an unventilated or poorly ventilated room every year. I asterisked the word 'accidentally' because particularly from charcoal burners there is no odour, discomfort, pain or any indication of what is going on so that is an option.

    • Like 1
  2. Finally got a least a good temporary ground installed. No shocks, no weird noises from my guitar amp anymore. Less than 1 volt diff between earth and neutral now. I have an "electrician" - don't know yet if he deserves the title, coming up soon to run a proper new ground and give an opinion/explanation on those white wires going to the ground bus.  I'm not inclined to move them just to see what happens. ????

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  3. 2 minutes ago, bankruatsteve said:

    Measuring the voltage between L and E is just a simple (for me) way to determine relative quality of ground.  IE: if voltage is pretty much the same between L-E and L-N, then you likely have a decent ground.  if voltage between L-E is same as N-E then your ground is not good.  Of course a stake in the ground will give you what it should be.

    I'm not comfortable messing around in the panel with power on.

  4. 1 minute ago, Crossy said:

    Since you are in a house take a walk and look at your power poles, a supply with MEN will have a ground wire from the neutral (usually the top wire of the ones on small insulators), if you are definitely MEN then a N-E link is a good idea.

     

    Can you post a photo of your distribution board with the lid off (care) so we can see what's going on in there too.

     

    What is MEN?

  5. Just now, Crossy said:

    Is that ground actually connected to the ground at the box and then the rod? A LOT of extension leads hve 3-pin plugs and outlets with 2 core cable!

    OK. I will do my own ground. I actually started to do that but backed off because of the other opinion.  I'm familiar with the ungrounded 3 pin extensions in Thailand. ????

     

  6. 2 minutes ago, Crossy said:

    Is your ground really good? (how do you know)

     

    Try measuring to a known-good ground (big screwdriver in the lawn), a floating ground would give you something like you are seeing.

     

    Are you in a house or a condo??

     

    I wouldn't go around connecting N-E unless you KNOW that you have a TNC-S supply with MEN.

     

    House, and I can drive in a good ground rod and try that. Thanks.

    • Like 2
  7. 58 minutes ago, bankruatsteve said:

    The voltage between N and E is a concern but you are not likely getting a shock from the neutral.

    What is the voltage between L and E?

    Is your guitar/amp connected to ground?  (3-pin plug)

    I would not bond the N and E bus without more information of your grid supply.

    Unless things have changed recently, US boxes have separate N and E bars which are bonded.

    Hi. Thanks. The amp is grounded. I don't know about the voltage between Line and ground - and won't measure myself because I don't know what I am doing! But will try and find out.

    • Like 1
  8. Hello,

    I hope everyone is well. I'm getting mild and sometimes not so mild shocks playing electric guitar if i am grounded. None if not. I'm repeating here what a friend has told me is the probable cause and solution. He says there is a good ground but there is a 75 volt difference at the mains between ground and neutral. When he checked each circuit it sometimes went down to to 45 volt. He suggests running a wire between the ground and neutral bus as he has done himself in Thailand (in the USA they would be on the same bus) but with only a few volt differential and is hesitant with such a large one. He also thinks this is the reason I have to set my Safe-T-cut GFI to lowest sensitivity.

     

    What do you guys think about both the diagnosis and suggested solution?
     

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