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  1. L

    Light fitting no earth terminal and metal

    well ,thats the theory at least.But in reality a loose cable (or damaged cable) could quite easily come in to contact with a metal frame.The concept of "double insulated" has (in my view) been diluted to the point where its almost meaningless.
  2. L

    Dno incoming tails too small?

    Its a highly unusual situation for me .Out of curiosity ,why would the DNO,s supply be MI?, Secondly ,is the the TN-S earth connected via a jubilee clip?
  3. L

    I.R. testing existing circuits

    I,m slightly off topic here ,but I felt I should say that I,m largely in agreement with what you say.Certainly ,I cant see the point of extensive electrical testing of a 5 year old family home ,when in reality a thorough visual inspection should suffice (plus testing of all safety devices)...
  4. L

    I.R. testing existing circuits

    While acceptable from the regs point of view ,in practice you would be unhappy, possibly concerned with such readings.There is certainly trouble on the way.
  5. L

    I.R. testing existing circuits

    A point well worth emphasising this.The sequencing of I.R. tests on existing installs.Always testing N to E first. Of course many of these faults should be picked up by rcd,s , but not all circuits are rcd protected and even when they are ,the leakage could be under the rcd threshold. I also...
  6. L

    I.R. testing existing circuits

    No.Like you I get the expected lowish IR readings associated with all appliances.But what I am really curious about is whether any one has experienced issues where electronics may have been damaged while carring out I.R. testing between L and E ?( I have,nt )
  7. L

    I.R. testing existing circuits

    The accepted method of I.R. testing existing circuits has been to join L and N together and test to E, to protect against damaging any electronics that were inadvertently left in circuit. However ,with the increase of new types of circuits between L and E as a result of "intentional leakage"...
  8. L

    Strange voltage on earth wire

    in addition to the above you may also have some current flowing in the earth resulting from the "intentional leakage" built in to many modern day appliances .But as alluded to by the previous posters ,regardless of the type or leakage source the solution remains the same....repair the defects...
  9. L

    Shock from switch due to dampness

    That explains it then.Any insulator (wood) will be converted to a conductor when water gets in.So essentially it is,nt the "plastic part" of the switch doing the conducting.Its the water in the poorly designed switch thats responsible.
  10. L

    What does or is C&G 2361

    I think that was the case universally.Your "PART A" and "Part B" were similar to our "Junior Trades" and "Senior Trades".The employers normally did,nt allow you to attend technical college after your first 2 years.Very few got to complete Part B.I was the only one in the firm who did but I had...
  11. L

    Shock from switch due to dampness

    Very interesting.I would add that ,since plastic is technically a non-conductor of electricity, would it be more correct to describe these Crabtree makes as "non-plastic"? They must have contained a component or additive that allowed for conduction.
  12. L

    MCBs tripping randomly?

    I am not inclined to add any more comment to this thread as in my first post (post 67).Having hastily read the thread,I suggested that the issue likely lay with the OP who I assumed (wrongly) was an amateur.I should have read the previous 66 posts more thoroughly.I want to offer my sincere...
  13. L

    IT configured back-up genny

    my apologies.I was a bit hasty in looking over it.Should have known you would have paid great attenion to detail🙂
  14. L

    IT configured back-up genny

    Think you have the nuts and bolts of a viable system there.Not allowable at this point in time to break the PEN conductor but it would,nt surprise me at all if that were to be reviewed in the not too distant future
  15. L

    IT configured back-up genny

    Correct.I could have phrased that a little better.
  16. L

    IT configured back-up genny

    Yes.Similar to UK I,ve been a supporter of this approach for a long time.This idea would (in my experience).. ..solve 100% of open PEN issues in new housing estates ..95% in rural houses ..very large numbers of urban houses.The remainder could have their metallic services rendered...
  17. L

    IT configured back-up genny

    not automatic.Will be connected to installation via a standard C/O switch and be switched over manually. yes it could.I,ve given consideration to that too.And of course an insulated plinth would work very well.Also thought about educating the homeowner about how to check for potential open-PEN...
  18. L

    IT configured back-up genny

    That was another option that crossed my mind but as you say it appears by no means simple to arrange.My next step is to contact PRAMAC and ask them ,regarding my concerns about the situation I,m installing their genny under, is "What configuration would you recommend?"
  19. L

    IT configured back-up genny

    Ironically I have just received an instruction manuel from the dealer(PRAMAC supplier).Until now I have not had any of my emails replied to as their technical helpline has been "under maintenance".The instructions state that an "insulation monitor" is available if an IT configuration is...
  20. L

    IT configured back-up genny

    Ah ok.That makes sense.And that could certainly happen on a non rcd protected circuit.But my situation has more to do with ,not what COULD go wrong ,but with what is MOST LIKELY to go wrong.

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