resistance | Page 8

resistance

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  1. F

    Insulation resistance test on a db supplied via a time clock

    Hi guys new to this website just a quick question as it has been a while I have a small 6 way distribution board this only becomes live via a time clock supply wired into it I'm going to be testing this board with a IR dead test on each circuit just to make sure according to guidance note 3 & on...
  2. J

    Low Insulation resistance readings when connecting final socket on ring?

    Hello All wondering if anyone could shed some light on a problem i have with my IR readings. I recently rewired a house.. took care pulling cables in etc . finished 1st fix, checked cables by looping ring main in connector blocks and doing continuity and IR test . continuity was ok, IR read...
  3. S

    Insulation resistance problem

    Hi all i was wondering if anyone could shed some light on my problem. Came to test a ring circuit today L-L 1.23 ohms N-N 1.23 ohms E-E 1.98 R1+R2 0.73 then i did my insulation resistance tests L-N 500 ohms N-E 500 ohms then L-E 0.00. Nothing plugged in, only a few sockets connected the rest in...
  4. S

    Trouble with an existing Pv system Schott Asi 105w panels

    Hi Guy after your best advice, been along to see a customer who is having trouble with his system which has been up and running for just over Four years and the original installers are no longer in business. He has approx a 17kw system of Schott Asi 105 w panels on the roof Appox 162 info...
  5. rolyberkin

    Earth Resistance Tester

    Any suggestions on an earth resistance tester which will not break the bank? Anyone got or used one of these UNI-T UT521 Digital Earth Resistance Tester
  6. W

    Short circuit

    Sorry just learning but with a short circuit. V=i x r so dosnt that mean that the maximum short circuit in a circuit with even no resistance would be 230 Amps. How comes I hear of higher currents in faults and breaking capacity for the breakers are 6ka.
  7. A

    Using pipe work to bond to incoming water

    I have recently come across a situation whereby instead of running a main equipotential bonding conductor from the MET to the incoming water someone had instead ran a short bond from the MET to some copper pipe in the mains cupboard and clamped it and then placed a bond on the pipe near the...
  8. W

    Insulation resistance

    Basic question sorry,just isn't coming to me at the moment. Why can you close the switches foe an insulation resistance test wouldn't that cut off the circuit and not measure the resistance after that switch.
  9. joel89

    Rotary resistance starter advice

    hi all, just looking at upgrading a george ellison old fillled rotary resistance starter on our forging hammer (the starter is pre-war 1924) the contacts are worn and the mechanical lever springs are also worn been temp fixing it for a year or 2 now, the motor is a 3ph 415v slip ring motor (big...
  10. 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...
  11. rolyberkin

    Resistance, Inductance, Capacitance and Impedance Questions

    Has anyone got any sample/revision questions for the 2365 302 for the above, just need to churn a load to get my head around them?
  12. 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::)
  13. 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...
  14. 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...
  15. 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?
  16. 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...
  17. 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
  18. 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
  19. HandySparks

    Insulation resistance and continuity meter

    I'm thinking of buying a combined IR and continuity meter for fault finding on domestic and commercial installations. I'd like something that's smaller, lighter and easier to handle than my Fluke MFT and fairly robust. It would also act as a partial backup in the event that the MFT is out of...
  20. 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...

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