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  1. W

    150m submain to multiple outbuildings earthing (PME)

    Hi there can I describe an installation and I would love to hear some opinions as to weather the earthing is up to standard. Its quite a long run so I'm concerned about the difference between true earth and system earth! Submain comes direct from meter cupboard in farmhouse through 100a main...
  2. H

    PME, to rod or not - college assignment

    Okay, I know this question pops up a lot but I want to be really specific, and ask in the trainee bit for your thoughts. I've done my first inspect & test assignment, and one of the questions is "show using the help of a diagram the earth fault loop path for an earth fault in the lighting...
  3. GMES

    Exporting Pme

    GMES submitted a new resource: Exporting Pme - About exporting pme Read more about this resource...
  4. A

    Pme and hot tubs

    Hiya all So on a pme system you can either use the earth from the cu and essentially export pme to the tub. Not against the regs afaik. Or tt the tub. Is there any tests that can be done (like the 23k ohms test) that will give a definite answer as to what method to use? For the people who...
  5. M

    PME and TT?

    Just checked the L-N loop at a fusebox and got a reading of 0.12ohms (great! :D), so going to call up and try to arrange to get a PME system put in. Anyway I was just going though 5.4 regs and didn't spot where (assuming it's in there) it says if it's ok to have both PME and TT earth connections...
  6. M

    PME to remote domestic dwelling

    Hi guys, thoughts on this would be appreciated. I have a 3 phase 100 amp PME supply, feeding 3 domestic dwelling about 80 mts away. Done cable calc and have chosen 50mm 4 core swa using armour to protect cable. In the 1st dwelling I have 3 phase metal DB feeding 3 sub mains, 1 to 1st & 2nd...
  7. J

    Which is the DNO earth block? PME

    Hi All I would be interested to hear your opinions on this situation: It's a property which used to have the electricity meter in the middle of the house, the consumer unit is still there and there is still a cut out with a 100A fuse in it, a neutral earth block and a small label that says it...
  8. dlt27

    PME Bonding help!

    More experienced help needed please. Scenario is Mains intake and MET(PME) outside the building in cupboard with KMF's (80A fuse) feeding flats via 16mmT+E. 2 flats gas meters are in cupboard at mains with 10mm bonds. 1 flat has gas meter in flat with no 10mm bond. Also no 10mm bonds to water...
  9. C

    100mA RCD Incomming NOT TT but PME

    Hi as the title suggests, I know of a Fuse Board, that has a 100mA RCD incoming However its not a TT system its a PME system, I've only been in the trade 2 years now so im still green, did it used to be the case that 100mA was the standard instead of 30mA protection for Domestic Dwellings...
  10. C

    Domestic Zs 5ohms! pme using electrode

    Hi. I have a family member who requires a new CU. She still has a rewireable fuse box and still has an ELCB. So no RCD's. Her install is a deathtrap waiting to happen from an earth faulr point of view! I replaced a socket on wall today and measured Zs. It was 5Ohms!!!! Shocking. I checked...
  11. NDG Elecs

    PME connection and stupid idiots!

    Hi, Had a little beer tokens job on way home today fitting a couple of smoke alarms. When I got there I noticed what looked to be a PME intake with no main earth going to it. Done a couple of Ze's and found the top connection in the photo was defunct, but the earth in the separate terminal...
  12. C

    Exporting PME

    I have a project to install 3 new TP distribution boards on a working commercial/industrial site. The main incoming supply is 3phase PME. The feed cables out to the new distribution boards will be a maximum of 40metres from the incoming supply and run in Swa cable (some above ground & some...
  13. HappyHippyDad

    Extending the equipotential Zone of PME installation.

    I was going to just add on to Voltz's thread but it seemed to come to a natural end but I had some questions. 1. A few experienced members say that you should not extend the (equipotential zone) EPZ of a PME system. Am I right in thinking that this is because of the possible potential between...
  14. ely_ellis

    To PME or not to PME?

    Hi, New to the forum and looking for some guidance. During an electrical test of a property it was found to have no earth connection other than to the incoming water and gas mains. Western Power were called to the property to confirm that PME was available but no terminal existed within the...
  15. A

    pme?

    Hi guys, I'm pretty new at testing and I started work a few months ago working on outdoor advertising units and bus shelters (please don't laugh) Anyway I'm trying to figure out supply types for when we test installations, now the stuff I work on (50% of it) is fed from a service pillar on the...
  16. driverman

    Diy pme system

    Says it all really. ohh, and the 2 x RCD's. They are connected together. no OCPD either!
  17. S

    TT system converted to PME - Earth rod query

    I've just installed two 100A isolators in a farmbuilding and the nearby house. The earthing arrangements seemed unusual. The power comes in overhead and a single cable drops into the main head. This has PME head and a label on the board stating that there is Protective Multiple Earthing. The...
  18. 1Justin

    odd "earth" cable between 2 PME heads

    I have some works at a small flat (4 properties). PME. Service head has been doubled up by DNO, so that supply cable for the second head exits the bottom and feeds the second. I find a 6mm green/yellow conductor strung between the PME break-outs of the two heads. It looks like the unusual work...
  19. D

    Exceeding max zs values on caravan site? With pme supply

    Hi all, first post on the forum and I hope you's can help me with a few questions I have. I have been asked to test a caravan site with the following details pme supply (with no individual spikes at hook up points) main 400a mccb with bolt on adjustable rcd(turned in the off position)i. I have...
  20. F

    Pme question

    While walking the dog local to some stables which were of the beaten track ,I was looking at how some of these houses got there electric supply thet were over head supply's .so I was thinking they must be tt systems but then I started noticing telegraph poles ,but electric ones with yellow signs...

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