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  1. ringer

    Ze and distance from substation

    Where would I find that warning then? These are MEM 3871 M6 type 2 MCBs. Have looked on the Eaton website, and found their MCB literature but unable to find any specific warning about excessive PFC.
  2. ringer

    Ze and distance from substation

    Customer is not rushing to sort this out, but wants to speak with me next week about it. Assuming for the moment that the measured value of Ze=0.01 ohms is correct, I am trying to establish what can potentially be done about this. To recap: TN-S, the DB circuit breakers are 6kA SCC, the DNO fuse...
  3. ringer

    Help with combination microwave

    What reg number is this, Tel? Not questioning your statement, just unable to find it in my BGB.
  4. ringer

    RCCD Tripping at least once a day

    On a split load board, with two RCDs, you can move circuits from one RCD to the other (physical constraints re cable lengths allowing) to balance out the 'normal leakage'. For example, if the underfloor heating, cooker and kitchen sockets were on the same RCD, then move one or two of them to the...
  5. ringer

    Help to understand pfc pscc values

    farmelectrics, look at the front of a MCB. It should have two sets of specification information (beyond BS numbers and manufacturer's ID info). A typical example might be B6A (indicating a 6A breaker as typically used for overcurrent protection on a domestic lighting circuit) and 6000 (or 6kA)...
  6. ringer

    Problems with megger Pat4dv download data

    Does windows recognise the USB? Look in Device Manager, I think it should be listed under 'Ports'.
  7. ringer

    Hager RCBOs deciding not to hold

    I stand corrected then, if RCDs can hold in when no power is applied. Yet I'm sure I've come across at least one where it would not hold in until power was connected. It was either Mem Eaton or Wylex. I usually switch off MCBs and RCDs before cutting the power using the mainswitch, so not been...
  8. ringer

    Hager RCBOs deciding not to hold

    If I'm understanding you correctly, you are saying that with the rcbo in your hand i.e. NOT connected to a power supply, you try to switch it from 'off' to 'on'. You are expecting it to remain in the 'on' position, but find that it doesn't, instead the switch automatically returns to the 'off'...
  9. ringer

    Hager RCBOs deciding not to hold

    What do you mean by 'does not hold when disconnected'? Rcds need power applied to hold latched closed (on).
  10. ringer

    Ring continuity

    Is there a particular reason why you are asking this?
  11. ringer

    Ring continuity

    Surely you would test RFC continuity under a EICR? Or are you suggesting there may be particular circumstances under which a LIM could be applied instead of doing these particular tests? If so, then how about a couple of examples?
  12. ringer

    Ownership of the supply earth

    Came across this last week. For some reason the MET has not been used, and the main earth to the consumer unit and the main bonding to the water service have both been connected direct onto the cable sheath using a BS951 type clamp. Any ideas why the MET might not have been used? And opinions...
  13. ringer

    Ze and distance from substation

    These measurements were made and recorded by someone else. I was just shown the PIR and had a quick look around. There are other issues with the PIR where recorded readings (or no readings were recorded!) do not ring true. Premises were in use at the time so was not possible to take my own...
  14. ringer

    Ze and distance from substation

    Was shown a PIR by a friend today where the Ze was recorded as 0.01 ohms. Not unexpectedly, the PFC was sky high at 19.9kA. I have never come across a Ze so low before. This is commercial premises, with a single phase TN-S supply. Now the nearest substation I am aware of is 150m away as the crow...
  15. ringer

    Tripping electric shower

    Spartykus, he's in the Scottish Borders, as he said in post #7
  16. ringer

    Tripping electric shower

    Tel, as he is replacing like with like and not running new circuits or altering the characteristics of the existing circuit, then there is a valid argument that RCD protection is not required. Naturally, it would be preferable to have RCD protection, but not absolutely necessary in this case...
  17. ringer

    Tripping electric shower

    Stoutlad, it sounds like you have done a pretty thorough job as far as you are able to. Unfortunately it is now time to call in the experts who will have proper test equipment. It might possibly be the MCB (trip switch as you called it) or it may be some kind of fault in the cables supplying the...
  18. ringer

    Test leads

    Got my replacement leads (for my MFT1552) from ISSWWW in Norwich MEG 1001-860 TEST LEAD 6220-796 6220-770 £30 inc VAT Slightly different to the original ones, slightly better in my opinion.
  19. ringer

    Electrical Assignment Questions Please Help

    answers in black above ^^^
  20. ringer

    2391 question

    Spark, where did you get this information from regarding testing at 5X ? And the 300ms for BSEN61008, all others at 200ms ?

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