resistance

  1. S

    insulation resistance query

    Hi, I'm after a bit of advice. British gas installing a new boiler, refused to install as fault on electrical system. The RCD trips when performing an ELI test. I've had a quick look tonight, TT system, rcd tests out ok. IR was 10 Mohms on all circuits except downstairs socket where...
  2. Simonslimline

    Series parallel combination resistance.

    Just spotted this on my facebook feed :juggle2: and thought it may be a good exercise for people to have a go at. What is the total resistance (Rt) of the circuit? :book::)
  3. T

    Insulation resistance query

    Hi, quick question for you all, do u think it is posssible to have an ins res reading of 0.02 on live earth of a lighting circuit which includes em. lighting but neutral earth is above 10 megohms ? There is low voltage track lighting also installed on the circuit. Also can anyone explain the...
  4. Peter Monfort

    Ring final circuit question

    When you do the continuity test on a ring final circuit and you have to connect L1 to N2 and vice versa, this assumes you know which L cable is the incoming or outgoing. I understand that if you connect L1 to N1 and vice versa the ohm readings rise then fall as you go round the ring circuit...
  5. Golden_Boy

    Stupid question? Re. Insulation resistance

    If when carrying out a "whole instalation" test from L+N to Earth the result is say 50 Megohms, and there are ,say,5 circuits would that mean that ALL the circuits pass the test or do each one still need testing?
  6. N

    R1+R2 per metre - trying to test against book values.

    I find working as a labourer I never have to think about basic theory, so it's easy for me to forget. Doing some experimenting tonight with 11meters of 2.5 T&E and a continuity tester. End to end on the line 0.15ohm CPC 0.20 Ohm It's not exactly what I expect. Is the difference something to...
    • newtothis
    • Thread
    • against book don't leads metre r1+r2 resistance test tester trying values working
    • Replies: 12
    • Forum: Electrical Course Trainees Only
  7. L

    Insulation Resistance Values

    Hi, I am getting a reading of Live to Live = 195 MOhms Live to Earth = 0.75 MOhms at the distribution board I am working on a Highway depot. Are these acceptable values? If not... what do I to? Thanks, Lasowski101
  8. F

    Insulation resistance

    Just want to see what other sparks think my nephew who is in his last year was telling me that there tutor was telling them that when your doing 3 phase circuits you use the 1000v range ???????????? Your thoughts please
  9. T

    Filling out Minor Works Certificate

    Just finished installing some low voltage downlights to an existing circuit , I'm going to test tomorrow to save disconnecting the lamps/transformers I was going to test LN-E 500v on the insulation resistance test , what do I have to write on the minor works certificate and where to show that...
  10. P

    Locating distance of earth fault in buried swa

    Hi I have a earth fault on a customers drive with 30 drive over fittings. The swa runs past each fitting and has a resin branch joint,with one cable going into fitting. Have narrowed fault down to cable by dismantling fittings etc. Is there any tester or method of measuring from the end of cable...
  11. N

    Street lighting fault

    I'm going round in circles with this fault. We have 12 street lighting lamp posts at our factory, 150W son lamps in each. They were on a 20A MCB and yesterday started tripping. They are basically wired from a 20A MCB (2.5mm), through a relay, out of the relay in 6mm armoured and then outside...
  12. P

    Testing IEC Extensions

    Hi all and thank you for letting me join the forum !! I do a bit of Pat testing at my work and have been asked to test some of the leads that attach to the IEC leads with the plug on(I.e. to make them longer). As these haven't got their own plugs do they have to be tested as surely they are only...
  13. L

    Earthing resistance

    Hello wondered if anyone can help. I have an exam in a couple of weeks and need to know this. Googled it but can really find an answer. The question is. What is the maximum allowable value of earthing resistance of a conductor by your local standards. Thanks in advance
  14. M

    indicators faulty...

    Hi guys this is probably a bit basic for what I've seen around here but I was hoping someone could help... I have an old Hyundai Excel '95 and the front and side left indicators are out and rapid signalling on the dash board and the back left light is rapid signalling. The first thing I tried...
  15. M

    High resistance on ring circuit

    I was to asked to add a spur on a ring circuit. I done a continuity test to make sure i had a ring the N-N was 0.46 CPC-CPC was 1.08, But my L-L was 2.4, i went round every socket looking for a loose conection. Tightened up a few loose sockets and the reading came down to 1.9 i coudlnt find any...
  16. S

    9KW Shower on 4mm cable

    Hi, While carrying out a periodic inspection I came across a 9kw shower on 4mm cable, 40A type B ocpd, 30ma rcd. I have given a code 3, for the following reasons; 1. No sign of thermal damage at any termination. 2. Shower cannot overload as fixed load. 3. Short Circuit & Earth loop impedance...
  17. D

    Confused...max electrode resistance with RCD?

    Sorry guys. Probably sick of me by now got exam tmrw and checked old posts and books but still bit confused with allowable max electrode values. Does max 200 ohms still apply if RCD is inplace? If so why do we even have a max resistance for rcd disconnection if these values are so much more than...
  18. N

    Insulation resistance testing

    Sorry, I'm almost ashamed to ask this question. Cooker switch with red indicator bulb (1)Please tell me what exactly what I do to not get moody readings on a IR test. ? (2) Are there any other tests that it would cause me a problem. ? Tried to search couldn't find an answer that clicked with me
    • newtothis
    • Thread
    • block circuit cooker indicator insulation insulation resistance insulation resistance testing resistance switch testing
    • Replies: 14
    • Forum: Electrical Course Trainees Only
  19. D

    continuity test on steel trunking?

    Hi guys Just a quick one. Doing 2394/5 going through mock paper can't find answer anywhere. How would a continuity test on length of steel trunking be carried out? Any help appreciated
  20. E

    Minor Works, Insulation Resistance Testing, and 612.3.3

    Hi all I couldn't find any previous posts on this topic specifically so looking for some advice. I am adding an external security light for a customer. I am extending the existing downstairs lighting circuit. Normally when testing Insulation Resistance I would test between L-N, L-E, N-E...
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