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  1. M

    Loop Impedance reading

    Yes sorry i misread it, and somehow missed the 0.6ohm ze part, ignore me !
  2. M

    Loop Impedance reading

    Did he, whoops my mistake Ahh yes just seen the 0.6 Ze measurement, sorry about that
  3. M

    Loop Impedance reading

    Do you know the earthing arrangement, you say you cannot see what the earth is attached too so could it be a TT earth and the rod has resistance of around 23ohms
  4. M

    Why does a "granny" charger for EV (<10A) not need an RCD?

    What about "granny chargers" on TN-C-S supplies, This could possibly pose a large shock risk. (iv pulled the pin out of the grenade) But as reg 722.411.4.1 says any outlet which is likely to be used to charge a car cannot use a PME earth without other precautions And as mentioned previously...
  5. M

    Intentional earth leakage

    Are switch mode power supplies not causing RCDs to trip due to harmonic content, in particular 3rd harmonics and how they affect the sine wave causing apparent higher neutral current and therefor causing an imbalance in rcd coil, and in fact has nothing to do with leakage to earth Thats why...
  6. M

    iPhone chargers. To test or not to test?

    A few people on YouTube have some videos of them tearing down cheap usb chargers and the like Alot of the cheaper ones have very poor seperation between mains input and low voltage output, and there have been quite a few reports of the seperation failing and mains voltage being present on the...
  7. M

    Mixing TT and TNCS supply systems

    These systems only disconnect the supply if the L - N voltage is outside of range of 207v - 253v it is still very possible to have a PEN fault with a dangerous voltage present on all exposed metal work and these devices would be non the wiser, therefore they do not protection against PEN faults...
  8. M

    Mixing TT and TNCS supply systems

    We only have a reliable solution if all 3 phases are present the current signle phase options are not really a solution I think the DNOs should implement PEN fault disconnection as they have access to all phases easily, but that would require more cost
  9. M

    TT to PME conversion

    If installing a car charger would it not have been easier to keep it TT, and then not have to worry about PEN fault protection, etc etc I guess getting it converted to PME means you dont need to worry about the possibility of the TT system being connected to the PME earth via water pipes and...
  10. M

    Hot tub electric shock

    or TT the tub to keep the indian stone
  11. M

    Hot tub electric shock

    or TT the tub to keep the indian sone
  12. M

    Appliances in single phase property damaged by 415v

    It would appear as if the DNOs have little regard for high impedance / open neutral faults, scary !
  13. M

    Hot tub electric shock

    Yeah bit annoying you can only see product descriptions and not buy them or see price etc
  14. M

    Hot tub electric shock

    Or check out earthingservices.com, they have an electrode which is a round disc they also have conductive concrete which can help increase surface area or make it possible to get an electrode in a tricky location
  15. M

    Hot tub electric shock

    Surprising the hot tub specialist didnt think/aware of the relevance of the earthing arrangement used as its quite important for hot tubs. The fact your electrican has fitted loads of hot tub on PME without issue doesnt mean the voltage drop on the PEN conductor is not the issue as this will...
  16. M

    UK My Fluke1662 has display but will not test, press test button nothing happens?

    Have you tried the button on the test lead, if it works with that test button on the probe/lead then it could be the switch/button on the unit at fault
  17. M

    UK My Fluke1662 has display but will not test, press test button nothing happens?

    My 1662 makes the shrill sound, when it's unhappy and doesn't want to test
  18. M

    Steel Awning frame outside EP zone, bondit?

    Could bonding it present a risk which was not otherwise there due to it being a TN-C-S supply Risk of metal frame voltage rise difference to the ground around it from a PEN conductor fault, or even tingles from normal PEN conductor volt drop
  19. M

    Earthing with solid rock below surface - burying tape for lightning earth

    might be worth having a chat with www.earthingservices.com They sell other alternatives to earth rods, for use in almost any location, including conductive concrete or foam which will shape around any rocks and give good surface area contact.
  20. M

    Large scale DMX controlled setup

    Sorry i didn't reply, I have been working overnight, but it seems rockingit has got you covered although nice analogy

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