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  1. ELECNEWT

    Equipotential Bonding Explanation

    Thank you Richard.Another brilliant diagram. It has helped me to understand fully. If I can add another maybe naive observation: even at 50V touch voltage, a current of 0.05A through the body (if you could not let go for five seconds) would be uncomfortable to say the least!
  2. ELECNEWT

    Equipotential Bonding Explanation

    Thank you Richard I understand now. I have been trying to teach myself. But as the saying goes "when you teach yourself you have a fool for a teacher".
  3. ELECNEWT

    Equipotential Bonding Explanation

    Richard, thank you for that response. I should have realised 60 amps related to a fuse. Referring to what you said: “They are saying that if 60A flows in the circuit and it is all flowing through the supplementary bonding (not very likely if there is a cpc) then the volt drop over that...
  4. ELECNEWT

    Equipotential Bonding Explanation

    I can understand that when supplementary equipotential bonding is applied, you can establish a bonding connection from very near to origin of the fault and so the voltage at the extraneous part (say a radiator pipe) will be very close to the voltage at the fault. Taking the example of a circuit...
  5. ELECNEWT

    Equipotential Bonding Explanation

    I can understand that when supplementary equipotential bonding is applied, you can establish a bonding connection from very near to origin of the fault and so the voltage at the extraneous part (say a radiator) will be very close to the voltage at the fault. Taking the example of a circuit with...
  6. ELECNEWT

    Equipotential Bonding Explanation

    Thank you Professor Burns. I calculated 0.11A and I did not realise that you had instated 0.46A as the worst case scenario. You must be a very patient individual to respond to such amateurs as I am.
  7. ELECNEWT

    Equipotential Bonding Explanation

    Thanks again Richard. I had not taken account of the 500 ohm resistance connection to earth. What is the calculation to derive proportion of fault current to 0.45 amps ?
  8. ELECNEWT

    Equipotential Bonding Explanation

    Richard, what a superb and comprehensive illustration!! If you can spare the time, could you calculate the current distribution for your third diagram to demonstrate why the resistance of the main bonding conductor, whether it is 0.05 ohms or 5 ohms, has no effect on the touch voltage?
  9. ELECNEWT

    Equipotential Bonding Explanation

    Thank you Richard
  10. ELECNEWT

    Equipotential Bonding Explanation

    Would any of the mathematically inclined members be willing to show some calculations for the following? The touch voltage when the main bonding conductor to the water pipe in Keenpensioner’s diagram is the prescribed value of 0.05 ohms. The touch voltage when the main bonding conductor to the...
  11. ELECNEWT

    CK Automatic or Irwin Vise Grip Wire Strippers?

    Stan Laurel agrees.
  12. ELECNEWT

    A New Month, A New Competition! 3 x C.K dextroVDE Slim screwdrivers sets are up for grabs!

    GERMANY
  13. ELECNEWT

    A New Month, A New Competition! 3 x C.K dextroVDE Slim screwdrivers sets are up for grabs!

    Manufactured in Germany
  14. ELECNEWT

    COMPETITION - 3 x C.K MIGHTYRODS PRO CABLE ROD 12m SUPER KITS!

    Glued, Indented, Crimped.
  15. ELECNEWT

    Notching the side of a joist?

    The strength of a beam in the lateral direction is directly proportional to the width (in this case 115 mm). In the vertical load carrying direction the strength of a beam is proportional to the depth cubed (in this case 400 mm to the power 3 ). Therefore the vertical load bearing capacity is...
  16. ELECNEWT

    Clamp meter for Megger MFT1720

    From Megger user guide. ICLAMP Current measuring clamp 1001-012
  17. ELECNEWT

    Guidance Please

    Hi, Does the attached NiCEIC factsheet apply?
  18. ELECNEWT

    Anybody experienced with LED...

    Does any one have any data or personal knowledge of the temperatures of lamps and chassis of GU10 5W LEDS ? I posted this question about a week ago and got a very useful response from Richard Burns. The reason I asked about lamp and the chassis was that I wondered if the the conical part...
  19. ELECNEWT

    Surface temperature of lamps and chassis on gu10 5w leds

    Thanks for the response. Very helpful. The reason I asked about lamp and the chassis was that I wondered if the the conical part behind the lamp would get very hot via the heat sink action.
  20. ELECNEWT

    Surface temperature of lamps and chassis on gu10 5w leds

    I am changing from GU10 50w Halogen to LEDs and most references only say that they run cooler. I just wanted to know how much cooler.

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