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  1. L

    SP/DP RCBO's for domestic .Do you have a preference ?

    He is referring to the advantages of DP rcbo,s over single pole. While it may not be a requirement ,it is always a benefit for final circuits to have DP isolation. Mainland Europe uses the same electrical systems as the UK.
  2. L

    How does Touch voltage work without RCD protection

    Touch voltage is a very simple concept when you look at it from the perspective of ohms law.. current flowing in the circuit multiplied by the resistance (earth rod in TT system). This voltage will be present on all earthed /bonded metalwork connected to the rod. The rcd has no affect on the...
  3. L

    Cooker becomes Oven and Microwave....any ideas?

    Thank you for this comment.Would love to have written it but my technical knowhow is not quite there yet.All fan manufacturers please take note. Look at a "stand alone " cooker 40 years old or more.?.You will see control wiring of 0.75 mm or less.Yet the manufacturer was quite comfortable with...
  4. L

    Cooker becomes Oven and Microwave....any ideas?

    Your conscientious is to be admired.But surely, is,nt it down to the appliance manufacture to display the same sense of care by ensuring his product is properly engineered to avoid been a potential danger ?.Appliance manufacturers know exactly what kind of scenario to be expected?.All domestic...
  5. L

    Cooker becomes Oven and Microwave....any ideas?

    I think this is the area where we as electricians can make life un-necessary complicated for ourselves. Our role has always been (and still is) to ensure the wiring we install is adequately protected. It is the appliance manufacturers responsibility to ensure his product is designed to be...
  6. L

    electric on all the copper plumbing in the house

    And theirin almost certainly lies the issue.I do not believe there is an electrical problem as such.The issue lies with the "high" neutral(several volts above "true earth,not unusual).As the neutral and earth are connected together in a TNCS system,the earth wire is transporting the neutral volt...
  7. L

    7kw electric shower - 4mm2 too risky?

    That's almost certainly an rcbo.It says C16.If it was an rcd it would say "16 amps". My electric shower is wired in 4mm (its a rented house).Its a T90 si, approx 1 kw larger than yours.The 4mm made me a little nervous at first and I checked the cable regularly for the first year or 2.The supply...
  8. L

    RCD tripping straight after smart meter install

    No we can,t.The regs are the regs and must be applied.What we can do though is look at the regs and put them in context and recognize that our regulators are learning too.That means that when we read a thread about a smart meter tripping an rcd we can be absolutely confident that it has nothing...
  9. L

    New Job

    So if you had,nt overdid it moving furniture you would be back at work Monday morning doing the job you clearly love?.On paper it does,nt look like a very difficult issue to fix ,but in reality I completely understand where you are coming from.I have always regarded "asking for help" as a sign...
  10. L

    RCD tripping straight after smart meter install

    That 25mm distance is another meaningless regulation.The gas pipe is already part of the electrical system by virtue of been bonded to the MET.
  11. L

    RCD tripping straight after smart meter install

    Extremely helpful post.Smart meters have long been suspect.
  12. L

    Ireland Wire Irish Home for USA Outlets

    A more permanent solution is certainly possible but you may find it more feasible to consider Julie's suggestion regarding transformers.Our American neighbour bought a small (but heavy duty) transformer to power his wife's sewing machine. I would also recommend you consider logging on to forums...
  13. L

    Why is oven tripping rcd?

    Definately worth checking.The common factor is that both ovans tripped rcd when desired temperature is reached.It would seem the temperature itself is not the trigger but the circuit that is been switched as a result of the temperature.The switching mechanism may well be the key to the probem...
  14. L

    120V from water tap to true earth

    I I, m progressive leaning towards the possibility there is actually nothing wrong and you could end up trying to fix something that is, nt broken. The DNO found nothing wrong with the supply or the earthing. They isolated the problem to the ring. The issue was solved when the loose earth...
  15. L

    TT with low ze when bonding connected

    Valid point.The idea of currents flowing along a gas pipe never sounds right.Risk of arcing. That will work when carrying out maintenance on internal metalwork.Such as changing a metal gas boiler.The Cross bonding serves that purpose. On external pipework however the housebonding is of no...
  16. L

    120V from water tap to true earth

    Correct.But in the case of the OP where it appears some unconventional electrics has been carried out I,m wondering how could reconnecting an earth possibly lead to the voltage on earthed metalwork been removed?The only examples I can come up with are.. 1) intentional earth leakage belonging...
  17. L

    120V from water tap to true earth

    Good question.I personally never measured a voltage that high that resulted from a disconnected CPC on a circuit containing appliances with intentional leakage built in. Looking at the problem from another angle ,it would appear that the homeowner solved the issue by reconnecting an earth...
  18. L

    120V from water tap to true earth

    Yes it could.And modern appliances with their built in electronics will quickly alert you to your poor earth as soon as you are unfortunate enough to make contact with the affected metal while standing on a poorly insulated floor or worse while simultaneously touching other metal that is well...
  19. L

    TT with low ze when bonding connected

    A metallic service pipe will always provide a better earth than a rod due to its much greater physical contact with true earth. In a fault situation electricity does,nt use one path as opposed to another.It uses EVERY path that's available.We are all accustomed to hearing "the path of least...
  20. L

    Insulation resistance test on a damaged conductor

    Yes it would.Your insightful questions highlight the limitations of our current testing equipment.Electricians cannot locate a conductor that is damaged but not severed.It is entirely possible that such a situation could occur and result in a "hotspot" due to high resistance.On the other hand...

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