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  1. newfutile

    RCDs for fault protection in adibatic equasion

    Could you not add a fused spur to provide protection for the spur? An mcb will always trip faster than an rcd in the magnetic(instant) part of the curve. Its all about the let though energy ,how much current is flowing thought the cable an the time its flowing,this is what heats the cable and...
  2. newfutile

    The end of NVQ3

    How will we have future QS if level 3 is required ?
  3. newfutile

    Electrics in Spain

    In England it would attract a C2 code from me,not sure what rules apply in spain
  4. newfutile

    LED Strip leaking AC reading.

    what do you mean by leaking? a voltage is a potential difference between 2 or more points ,presence of a voltage ac or dc means little ,its the current that flows or could flow thats important. its usually a capacitor or other component for emi that causes these things , if from a reputable...
  5. newfutile

    Whirring fridge freezer - manufacturer giving me the runaround

    the warranty does not matter , the consumer rights act 2015 is the law . there may be parts that may freeze up or the defrost heater may not be working for some reason, best to try the advice given . your contract is with the supplier not the manufacturer
  6. newfutile

    Bonding 😣

    are there more than 1 items of conductive parts that you want to prevent from different potentials ?this is what supplimentary bonding is usually for in my experience , whether it needs main equipotential bonding is another mattter,you have said it was a dead short but also stated its over 999...
  7. newfutile

    Bonding 😣

    Unless you can't meet disconnection times why would you need supplimentary bonding ?
  8. newfutile

    Bonding 😣

    I take it you measured with the bonding disconnected? There are a few other ways a pipe can be connected though to earth ,via boiler or cylinder CPC ,or via a gas bond if there is one. Try a low ohm test to give you a clue . If with all parallel paths disconnected it's less the was 23 K ohms I...
  9. newfutile

    Shower priority units

    One of our contractors has identified a concern with multiple showers on a single 100 amp supply.(unsure how many yet i have asked for further infomation) They have asked our company for a solution (which means me!). Other than getting a 3 phase supply in the only other way is a shower priority...
  10. newfutile

    no access to db

    schneider have confirmed they dont make the door /lid i require . NICEIC have said to contact the original installer who is a NICEIC AC . its in a walk in cupboard with plasterboard walls and a door to the left of the Consumer Unit ,the manufacturer also said i cant drill out the door hinge...
  11. newfutile

    no access to db

    its not due a test until november 2024 , but in one of our block of flats ,a schneider 24 way db has been installed on the right hand side of a tight cupboard. the door is hinged on the left. schneider dont make a right hinged door. im mostly out of ideas other than getting the original...
  12. newfutile

    Hi Ze Reading

    earth clamp on armoured? i would hope we are not talking about a BS951 earth clamp . as everyone says you have either a bad cable or bad connections .sometimes a thermal camera can help if you load the cable with an electric heater . I squared R losses would make for some heat under load. check...
  13. newfutile

    PAT FAIL HELP - 19" Rack Mounted Surge Protected Power Strip

    SPD would usually pass at 250v dc but not at 500 v ,it could be the spd itself . i would contact the manufacturer for advice and expected readings
  14. newfutile

    RCBO curve

    you may want to change if maximum ZS does not comply or if you require a faster disconnect time, 80% values for a D16 is only 0.54 ohms. i would say its good practise to design circuits to trip on the mcb portion (if possible) then the (RCD) Residual Current Device part is just for additional...
  15. newfutile

    Water bonding query

    Depends if it an extraneous conductive part, measure ir from pipe to met, I use 23K ohms as allowing 10 ma of fault current to flow. GN8 gives more information about this and other values that you could use.
  16. newfutile

    19th edition....................!

    It's not Micheal Faraday house any more
  17. newfutile

    NICEIC Certification Scheme NICEIC PRICES INCREASING - IS THERE ANYWHERE ELSE TO GET CERTS?

    I use icertify for mine,I would just use fillable pdfs or even hand write them,there's no need to use niceic own ones
  18. newfutile

    Why ? 120-130v old tester

    my kewtech does the same thing i treat it as an error message , i expect there is a potential divider in the meter
  19. newfutile

    Lighting circuit trips RCD but not MCB, can’t find E-N fault

    take all the neutrals out of all the neural bars (mark them first) puts wagos on each one and power up the offending circuit,any neutrals connected though a load will now become live, i use this technique to upgrade mcbs to rcbos
  20. newfutile

    WT Henley Series 8 house service cutout

    Just get a Henley block the neutral current will always be less than 100 amps, most 3 phase supplies only have 1 neutral. Think of a 3 phase motor which may need no neutral as all 3 phases are balanced

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