resistance

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  1. L

    Value of ohmic resistance

    What could be a typical value of the ohmic resistance for contacts in protective devices? I need those for verification of some assumptions made for a loop impedance calculation. If someone could also tell me if there is some measured value for wall sockets (for my general knowledge). Thanks!
  2. A

    UK Oven element insulation resistance readings

    I have a dual grill element from an electric oven, one circuit of which trips the power when switched on. I have removed this to replace it and have since tested it with an insulation resistance tester. For the good circuit, I get a reading of 500MegOhms, for the supposed "bad" one, 20MegOhms...
  3. P

    Difference between 250v/500v insulation resistance and 15ma/200ma continuity test?

    Hi I hope everyone is all well. I’ve built a rig at home on some ply to do some testing and fault finding to prepare for my exam and just learn in general… I put 100v then 250v through L & N through a B22 led lamp and also the spur neon to see what reading I would get. They were both the same...
    • ppelec100
    • Thread
    • between continuity difference insulation insulation resistance resistance test
    • Replies: 5
    • Forum: UK Electrical Forum
  4. S

    Hi I’m looking for the maximum permissible resistance reading of earthing rods

    Hi could anyone point me in the right direction for the maximum permissible resistance reading for earthing rods?
  5. J

    Insulation resistance test readings.

    Had an interesting one today, ring circuit blown the Mcb in a kitchen apparently a few times over last day or so. It has blown once when nothing was really in use in kitchen so kind of ruling out overload. When turned up and turned it back on it held for maybe 5 minutes before blowing again…...
    • Jm1980
    • Thread
    • insulation insulation resistance insulation resistance test readings resistance test
    • Replies: 2
    • Forum: UK Electrical Forum
  6. A

    Insulation resistance results weird on actuator circuits

    Interested in people's thoughts/experience here. I've just been testing out the insulation resistance on a 20 year old surface water pollution control facility. It has a large number of penstocks with Auma actuators. Here's the puzzle: on a few of them, the resistance - although passable - is...
  7. KeenPensioner

    Insulation Resistance

    As an adult learner I understand that any equipment connected to a circuit that may be damaged by the IR test voltage should be disconnected. I watched an electrician carry out an EICR on a property I rent. On a ring final circuit he removed the plugs fom the sockets before carrying out the...
  8. A

    Insulation resistance problem

    Hi all, Stuck on another job here IR testing. It's a simple 3 bed semi and after short put L-N at board and testing to earth, I'm getting 0.16 Mohms. I've disconnected main incoming neutral, no surge protection of any kind in the house, I've taken out all lamps and plugged out anything I...
  9. shanky887614

    For Sale Megger MIT30 30-kV High Voltage Resistance Insulation Tester 30kv. VAT Included

    Megger MIT30 30-kV High Voltage Resistance Insulation Tester 30kv. $1700 shipped PayPal F&F accepted only. In great condition, like new. Recently calibrated- valid till 23.05.2025 Comes exactly as pictured with standard leads, power cord and manual.
  10. A

    Help with Low insulation resistance reading

    Hello everyone, Hope you're all well. I'm carrying out an overall/global insulation resistance test on a newly wired 3 phase installation we did recently. I joined all 3 phase together to neutral and tested from the busbar to earth. I'm getting a reading of 1.33MOhms, and here in Ireland, we...
  11. Mike Johnson

    Digital Earth Resistance Tester

    I have a PeakTech Digital resistance tester for sale, still in it original packaging, never used, cardboard box is a bit shop soiled, but the equipment is still in new condition anyone interested I will take £65.00 for it including postage: PeakTech 2700 - Digital Earth Resistance Tester 3 ½...
  12. A

    Insulation resistance testing live conductors to earth

    Hello all, I hope you're all keeping well. I have a question regarding insulation resistance testing. Whether doing a single circuit IR test or a global IR on an entire installation, I usually try to remove all loads, eg lamps, neons etc, but obviously this isn't always possible. So I...
  13. L

    Burned wires on resistance faston connection on professional Coffe machine

    Hi all I have a professional coffe machine working at 220 V and it currently drain about 2,5 kW of power. I have made this simple and horrible schematic here just to explain how it works: Some time ago I changed the fastons on the resistance from brass faston to stainless steel faston and some...
  14. P

    Soil earth resistance survey

    Has anyone here got experience of doing a soil / earth resistance survey for the design of a large-ish site? We might be looking at a fenced area of 150 x 40m or so with possible need for lightning protection and/or input to the decision to have the substation within the site or far enough out...
  15. eletric

    Grounding Rod Resistance

    Now I understand why so many people in US have stories of computers blowing up during thunder storms. This is a pretty dumb rule for ground electrodes: If the resistance is over 25 ohms for an electrode, the code requires that an additional electrode be installed at least 6 feet (1829 mm) away...
  16. P

    Can earth electrode resistance values be too good/artefactual?

    Hi all, Would like some advice on the below. Context: Rural French domestic installation TT system Earth rod is situated inside the property, buried in the concrete subfloor Distribution transformer (overhead supply) is very close, on a pole approx 40 metres from the property I did some 3...
  17. S

    Insulation Resistance Testing Am2 - requires to be tested twice

    Hi, I'm a little confused confused is someone can shine some light on the amendment 2 way of doing IR. I know you have to do one 1st fix at 500V DC and then final one at 250V DC when all cables. What I'm confused about is GN3 states: "...sometimes these cables are terminated without further...
  18. M

    AM2S Insulation Resistance Test on RCBO

    Hello, I’ve got my AM2S coming up and I’ve been revising like mad but I’m stuck on something. I’ve read that it’s a 3 phase board with just one RCBO for the ring circuit. Assuming they want me to do a global IR test, can I take the conductors out of the RCBO, switch it off, and then test...
  19. newfutile

    Insulation resistance problems

    During an insulation resistance test IR at an EICR I measured 0.0014 MegOhms from line to earth. When I disconnected the neutral from the neutral bar it's 116 MegOhms lowest (on the outside bollards). However measuring from disconnected neutrals to earth all read over 200 MegOhms. So it...
  20. Charlie_Don't_Surf

    Flummoxed by a basic parallel resistance question

    I normally bash through these worksheets quite quickly (or at least, I rarely get one like this which I just can't suss out), but this one has got me stumped. Yes, I've googled it and youtubed it for a while (although usually I only really resort to that when I don't have the knowledge to work...
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