resistance

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  1. D

    insulation resistance question FICA

    Hi yesterday I sat my FICA test and during the insulation resistance test I’m not sure if I made a mistake I measured it doing individual circuits I had the main switch at db on but forgot to turn on the mcbs I measured between Line at MCB and earth and Neutral bar to MCB then neutral bar to...
  2. N

    Insulation resistance - strange readings

    Im getting some strange reading on a new circuit(ring main) ive installed and i was wondering if anyone else had experienced the following. insulation resistance at 500v on L-N is >500mQ (which is fine) then insulation resistance between N-E starts at 400 then climbs to 500mQ then insulation...
  3. J

    Help working out resistance and supply current please.

    hi, I’m doing some revision and I can’t quite understand working out the resistance of a circuit or the supply current. Could some one please help and explain how it would be done please? I have attached a photo of the network and the question. Thanks
  4. S

    NO switch insulation resistance failure

    How often do we usually have insulation resistance failures on an NO switches leading to unexpected starts?
  5. L

    Insulation Resistance test question?

    Hi guys, I have what may seem a basic question. If a cable has been skinned at some point along the circuit would an IR test pick that up in the readings? Many thanks
  6. B

    3 Phase Insulation Resistance Test on motor & TP & N skt help

    Looking for some advice on how to carry out a IR test on a 3-phase motor and a TP & N skt, these are parts of a module I have failed on a test and am looking to see where I am going wrong and what the normal procedure for carrying out this test would be?
  7. I

    Temperature probe with 110k ohm resistance!

    Hi all I have an electric underfloor heating system in my bathroom with a Timeguard TPT88 controller: (TPT88 - 24 Hour/7 Day Multi-Programmable Thermostat | Timeguard - http://www.timeguard.com/products/climate/thermolay-ufh-controllers/24hour-7-day-multi-programmable-thermostat) The system as...
  8. Mark42

    Insulation resistance failure on rubber flex. Why?

    Two years ago I installed some garden lighting, using u/g SWA to Wiska boxes, then 3-core 0.75mm rubber flex downleads from each LED fitting. This week the 30mA RCBO kept tripping. I assumed a luminaire fault, or moisture in a Wiska box, but no. It was leakage across all three cores of one 10m...
    • Mark42
    • Thread
    • failure flex insulation insulation resistance resistance rubber
    • Replies: 19
    • Forum: UK Electrical Forum
  9. B

    Insulation resistance testing

    Hi have AM2 next week and just need some help, 3 phase TP+N board, two way and intermediate lighting circuit with 3 switches obviously and one light, doing a global IR test, the lighting circuit say is on L1, so I’m testing all other circuits at once too do I have to switch my switches for every...
    • Bradley6969
    • Thread
    • insulation insulation resistance insulation resistance testing resistance testing
    • Replies: 44
    • Forum: UK Electrical Forum
  10. P

    Earth Resistance checking without removing earth cable from earth pit

    Hai all, What will happen if I didn't remove the earth cable from earth pit while taking earth Resistance. Is that mandatary to remove the earth cable from pit while taking resistance using earth tester
  11. Strima

    CSA and resistance of 20 & 25mm Steel Conduit

    Can anyone point me in the right direction to find out the CSA and resistance of 20 & 25mm steel conduit? It's for part of my 2396 project where I'm using the conduit as CPC, I'm happy enough with the calculations I just need some numbers to work with. I've tried various manufacturers websites...
  12. 1

    Insulation resistance test

    Hi all on a eicr insulation resistance test between live conductors to earth gn3 says join l & n and test to earth is there any difference between that and testing phase to earth then neutral to earth? As you guys know some boards are a right mess and not in order to locate which belongs to which
  13. J

    Resistance Level 2 - HELP NEEDED!!

    hey, I am currently completing City & Guilds level 2 and stumbled across the below questions and scratching my head... 1. Electric Fire element has a length of 10m, a cross section area of 0.5mm2 and resistance of 50 ohms - calculate resistivity of material used. Thanks
  14. M

    No resistance Circuits

    Hi guys, How do you use ohms law on a circuit with 0 resistance? So, assume there is 10Amps and 0 Ohms on a circuit, how would you find the voltage? (E=IR?) Also assume you have a circuit with no resistance on it, where would be considered the return path? Like the potential difference I mean...
  15. P

    Cables with thermosetting insulation (XLPE cables)

    I understand that XLPE cables operate at a maximum temperature of 90c compared with 70c for PVC insulation. What I don't understand is why the increased temperature permits a reduction in conductor size if XLPE insulated cables are used in preference to cables having PVC insulation. If the...
  16. M

    Grounding Question

    Hi guys, I'm trying to better understand how grounding works. I got the basic idea of it, but still have a lot of questions about it. K, so from my understanding, if you touch the neutral bar on a service panel you will not get shocked (because it is grounded). But why do you get shocked if you...
    • mdjakhi
    • Thread
    • earth grounding neutral question resistance touch voltage
    • Replies: 4
    • Forum: UK Electrical Forum
  17. M

    Resistance per meter of armour

    I know it's late and the lap dances are still open , so i will wait till tomorrow for any replies . Does anyone have resistance per meter tables for steel armour 90degree thermosetting ,can't find it anywhere . Ta
  18. D

    Diode advice

    I currently have an intermittent issue with a disabled alarm system. The pullcord has a fault monitor connected across it in the form of a resistor and diode in series which I suspect is the culprit. The diode only reads continuity one way as expected but the resistance through it the correct...
    • Deleted member 9648
    • Thread
    • advice diode meter multimeter resistance using
    • Replies: 9
    • Forum: UK Electrical Forum
  19. D

    VIR or PVI

    Hello Guys This is a right noob question but its really been bugging me. ok so i have a pc which is 500watt (labelled) but runs on 110v and 230v. V/ I X R : 230/38 = 6.05A 110/38 = 3.10A But using the formula P VI i get the following i wanna work our i so p/v 500/230 = 2.17 500/110 = 4.54...
  20. S

    500v Insulation Resistance Test ok?

    Hi all, still training so please forgive my very simple question. Why is it ok to test an appliance at 500vdc when PAT testing but great care should be taken to remove all equipment when IR verifying a new circuit installation? Is it simply just because connected equipment will make a nonsense...
    • shinypen
    • Thread
    • connected equipment great insulation insulation resistance insulation resistance test resistance test testing
    • Replies: 4
    • Forum: Electrical Testing & PAT Testing Forum

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