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resistance

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  1. R

    Ring main IR question from todays EICR

    Hi All, While carrying out a commercial EICR today, I was doing IR testing on one of the ring mains an was getting 0.00M ohms between L/N - and the earth bar at 250V & 500V (cant distinguish what 2 earth wires belongs to the other 4 cores) I have continuity on both L & N legs which are...
  2. HappyHippyDad

    What could cause my voltage to drop to 28V??

    Evening all.. I have just tested a cable that I had put in place myself for a smoke detector and I am only getting 28V L-N. I am getting 240V L-E. When I first put it in it tested 240V. Since then the builder has been in and put the ceiling up, I'm not saying this is the cause but this is the...
  3. J

    "Electrical leak trace resistance" and "Anti-squelch interference capacitor"

    Hello, I am a translator translating a standards document from Chinese. There are electricity-related sections in this document which contain a couple of terms for which I have not found an adequate translation. These two terms translate literally as "electrical leak trace resistance" and...
  4. B

    Caravan suppły RCBO

    Hi I haven't posted for a while but I'm having some issues with a caravan park I have recently carried out some work on and washoping somebody may be able to shed some light on the issue. The problem is burnt out neutrals on out going side of RCBO, we have replaced 137 caravan suppły points...
  5. S

    Fridge fan motor windings

    Hope this is the right location to post. I asked my friend to give me the motor that he replaced for his fridge. I checked the 2 terminals with an ohm meter and it showed 470k Ohm. I then used a megger between the same two terminals at 500V and it showed 0.02M Ohm and 20V (short?) Could...
  6. H

    Loop method using Fluke 1653

    Hi all! I tried to measure earth resistance by loop method using fluke 1653 at MR system (TN) in hospital. But got abnormal results. The primary (upper) display showed 0.16 - 0.2 (loop impedance) and secondary - 0.0 - 0.1 (earth resistance) Is there some limitations using this method? Cant find...
  7. A

    An insulation resistance test

    Hi, Can some one please help me with this question: Q: An insulation resistance test on one of the radial socket-outlet indicated zero mega ohm between line and neutral. Explain why the result of the previous R1 + R2 test could not be used to confirm polarity for this circuit. If any one can...
  8. D

    Insulation Resistance testing procedure

    Hi all Am doing 2394/95 at moment and trying to get procedure firmly stuck in head. Thing I'm getting a little bit confused with is with some of the vids/examples online some state to switch main switch on (obviously before supply connected) and others off. My thinking is that you might as...
  9. E

    Twin and earth testing

    Hi, A quick question, maybe a stupid one .... but it baffles me ,and I cannot find any info on the net. If you do the continuity test on a lighting circuit to get your resistance values, wired in twin and earth, how do you the the value for the earth ? Obviously you link the earth and phase or...
  10. J

    Fault current, and earth electrode resistance: Numbers not making sense

    In "Advanced Electrical Installation Work" by Trevor Linsley, he says that an earth electrode rod that is 1m deep will typically have a resistance of between 10 and 200 ohms. Given that fault currents can supposedly, momentarily, be in the order of 1000's of amps, this makes me scratch my head...
  11. P

    Insulation resistance help

    I'm still a newbie but here goes. as part of my Elecsa assessment I have changed the outlaws 1970's Fuse board to a new 17th edition cu. the wiring is still original as well. Due to equipment that I cannot get to or remove I bridged the line to cpc and tested between that and neutral. On all the...
  12. N

    Voltage Drop Equation

    Hi, I've been doing some revison and came across 2 different equations for voltage drop. The first one is; Vd = mV/A x Ib x L divided by 1000 The second one is; Vd = (R1 + R2) x Ib x Multiplier The multiplier is to compensate the difference in conductor temperature at the time of the test...
  13. S

    Insulation resistance testing

    Hi guys, i have always wondered when doing insulation resistance testing is there a test you can do to see if there are any loads still connected (ie neons,equipment) to see if the readings are true or through loads connected in the circuit.
  14. G

    Eicr insulation resistance testing

    Hi All. I am currently carrying out an EICR in a local hotel. I was wondering how each of you carry out insulation resistance testing during a periodic inspection? For lighting etc I have used joining live-neutral together and testing to earth due to the unknown possibility of electronics and...
  15. L

    Earth Electrode Testing

    Hi, How to test an earth electrode resistance for Lightning Protection System in the middle of large concrete pad? I cannot not find a soft ground for spikes to drive in for testing. Is there any other ways of measuring the earth electrode resistance value? Thanks Laxi
  16. D

    Insulation Resistance of floodlights

    I keep getting short circuit between live and earth. I can't work out wether this is normal or a genuine fault. Unfortunately I can't lower the floodlight to inspect further. Can only test at the bottom of the base. Can any one help?
  17. R

    Falling insulation resistance

    Yo folks, Not sure that this isn't the second post on same topic, first hasn't appeared. Apologies if so. Ahead of altering upstairs lighting circuit to add a couple of downlights to an ensuite I carried out the usual tests. Got odd IR results. L-N >1000, L-E >1000, N-E 10!. Did a bit of...
  18. rustynails

    Insulation resistance on a lighting circuit

    Today I got 0.11 Mohm L-N>E at 250v then the same at 500v on a 6amp lighting circuit wired in the 70s which is the only lighting circuit for the house. Customer did not want me to remove the lamps. I forgot to ask or see a bell transformer or aerial booster. No faults known to the customer. MCB...
  19. Dean Williams

    insulation resistance test method 2

    Hi gang im currently testing a power station, ive been told to use method 2 ie link live to neutral and test to earth on all the lighting circuits, which are all in SWA on tray with no switches in the circuits. all readings ok so far, but the last couple are reading 0.00ohms. these circuits...

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