resistance

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  1. happysteve

    What would give a low N-E resistance (at DC), but not cause the RCD to trip?

    I'm familiar with RCD spurs giving readings of 0.1 to 0.3MΩ when testing insulation resistance (L+N tied together to E), but what would give a reading of about 65Ω (when tested with "low resistance ohmmeter" i.e. continuity setting) N-E? On a lighting circuit - N isolated from other N's...
  2. wsoppitt

    Insulation resistance issue.

    This is a new 1 on me. Testing a ring final circuit within a timber outbuilding. All clear on insulation resistance with socket fronts connected but not screwed into metal back box lug. As soon as I connect any of the plates to the back box I'm getting around 16megohm between n and cpc. When...
  3. M

    What should be the minimum resistance required between 3 phase and grounding (connecting wire to earth)

    Hi I am new to electrical engineering. I want to measure the 3 phase voltage near the water pumpset motors. I have connected phase lines to earth through a diode and six 1 mega ohm resistors (measuring the voltage across resistor). The same earthing wire is connected to ground in my dc circuit...
    • Manjunath
    • Thread
    • 3 phase between earth grounding minimum phase required resistance wire
    • Replies: 5
    • Forum: UK Electrical Forum
  4. J

    PAT testing 32A cable

    We have some 32A extension leads that range from 5m to 20m, I'm struggling to find what the acceptable values are for the resistence test. The PAT tester has a built in calculator, but that only goes up to 4mm cable, this is using 6mm. Where can I find the information I need to get the pass...
  5. M

    How do i calculate missing resistance readings in a parallel circuit using R1 and Rt

    Hi I am a current student studying to become an electrician and a question has thrown me. I'm wondering if someone could help, there is a question on one of my home work books. "complete the following table assuming the resistors are connected in parallel?" the example I will give is R1 is 120...
  6. E

    Insulation resistance check on LED fittings

    Hi, Do I need to disconnect LED fluorescent fittings when doing an insulation resistance check? Thanks
    • Everzy28
    • Thread
    • check disconnect doing fittings fluorescent insulation insulation resistance led resistance
    • Replies: 2
    • Forum: Lighting Forum
  7. M

    What are the implications of a failed Neutral - Earth insulation resistance test?

    Greetings! Newbie here! We have 3 phase installation in our Lighting dimmer rack. During Insulation Resistance testing on Earth-Nuetral, readings was 0.33Mohm on 500v test. What causede the failed test and how can I troubleshoot? Thank you! Markus
    • markusjames
    • Thread
    • earth failed insulation insulation resistance insulation resistance test neutral resistance test
    • Replies: 20
    • Forum: UK Electrical Forum
  8. B

    Insulation Resistance Calculation

    Hi, I have an engineer who is completing his 2391-52 exam tonight and he has been told one of his mock questions was wrong, I have completed the working out myself and came up with the same answer as him, so either the paper is wrong or something has literally left my mind!! "Determine the...
  9. G

    Insulation Resistance Testing

    Should I remove all the loads when testing between live and neutral?
    • Gassan
    • Thread
    • insulation insulation resistance insulation resistance testing resistance testing
    • Replies: 10
    • Forum: UK Electrical Forum
  10. J

    Acceptable TT earthing resistance for EV point

    I understand that some vehicles do a check on the earthing resistance before they allow themselves to connect to the charging point, so irrespective of whether the earth resistance is in line with the regs, it may not be 'acceptable' to some vehicles. Does anyone know what value of resistance...
  11. Q

    Insulation resistance with vulnerable equipment unable to be removed

    Good evening Was wondering when testing for.insulation resistance and there is vulnerable equipment in circuit but unable to disconnect, I understand that you combine the line and neutral conductors and test to earth. I am just wondering if it's ok and safe to do this at 500v as there is no...
  12. C

    How do i calculate the total resistance in a series-parallel circuit?

    Hey, I'm an electrical engineer in training and i was wondering how you could calculate the total resistance in a series-parallel circuit? I attached a picture of what it looks like. If it's to any help resistor 1 is 2, r2 is 3, r3 is 4, r4 is 5 and r5 is 6 Ohm. Thanks for any help
  13. B

    How do I calculate the resistance of a spur without phisically testing ? ..

    Boffins of the electrical world ... How can I calculate the resistance of 48m ring 2.5/1.5 .. with a 8m spur .. I can quiet easily do this without a spur in the equation but , my test papers require my doing so with an 8m spur. . how does this affect the zs tests ... Thanks v much ...
  14. C

    Rise in resistance during test video

    Why does the resistance go up during this test? View: https://youtu.be/8040r2iLqyM?t=1150 In fact it goes up several times during the video. Is this the wire charging up from capacitance? I'm clueless.
  15. KeenPensioner

    Insulation resistance with broken line conductor

    Hi, I'm not an electrician but I'm studying the material required for the C&G 2394/5 just for the sake of it. I think I understand the theory behind insulation resistance testing (but maybe not!) and the reason the test is performed at 500V (insulation condition, fault finding) and that loads...
  16. S

    Insulation resistance testing

    456megaohms on a 25m 3core swa is acceptable as its more than 1megaohms. Correct.
    • Sparks321
    • Thread
    • insulation insulation resistance insulation resistance testing resistance testing
    • Replies: 1
    • Forum: UK Electrical Forum
  17. HappyHippyDad

    Global Insulation resistance <1MΩ but individual circuits are all > 1MΩ

    With regards the title is the reason for this because the circuits are all in parallel? I am talking in relation to a L/N - E test. If Rt = global resistance for whole CU and R1, R2, R3 = L/N - E resistance for each circuit then am I right with the following: 1/Rt = 1/R1 + 1/R2 + 1/R3 So...
  18. P

    Low N/E insulation resistance

    Hi all, Just installed a brand new radial circuit for the upstairs sockets with Prysmian 2.5mm T+E, around 21 metres in length. When testing the insulation resistance of the circuit upon connection to the consumer unit, I seem to repeatedly get around 49 Megohms when measuring Neutral to Earth...
  19. D

    Quinetic controller ok with 500v insulation resistance test?

    Hello Everyone Hopefully the title is self explanatory. Or should I disconnect it for the test?
    • Deleted member 112675
    • Thread
    • controller insulation insulation resistance insulation resistance test quinetic resistance test
    • Replies: 6
    • Forum: UK Electrical Forum
  20. A Basic Understanding of Voltage, Current and Resistance.

    A Basic Understanding of Voltage, Current and Resistance.

    An easy to understand lesson in Voltage, Current and Resistance for electricians. Learn about the basics of voltage, current and resistance in this video tutorial.
    • Lou
    • Media item
    • current electrical training resistance voltage
    • Comments: 0
    • Category: Trainee Electrician Videos

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