resistance

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  1. 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...
  2. J

    2394 practice question

    How would one figure out the following question? The resistance of a 2.5mm copper cable is given as 7.41M Ohm per metre at 20 celcius and that of a 1.5mm copper cable is given as 12.1M Ohm per metre. A circuit wired with 25m of 2.5/1.5 twin with cpc sheathed cable would have an expected R1+R2...
  3. B

    Ring end to end results not text book for cu change.. do we need to ensure 1.67 times

    Hi, Cu change pre tests (TT) indicate non text book results: r1=072, rn=0.92, r2=1.58 another ring: r1=0.67 n=0.67 r2=1.60 As can be seen the r2 values are more than 1.67 times r1 or rn possibly due to loose connections. Are we responsible to try and bring these values in line for a cu...
  4. C

    RCD question

    Can anyone tell me what thelowest insulation resistance for a low voltage circuit tripping time on a rcd or where i could find this on the regs
    • Callumi565
    • Thread
    • insulation minimum question rcd resistance
    • Replies: 4
    • Forum: UK Electrical Forum
  5. M

    low insulation resistance on 35mm lsoh cable

    Looking for some advice.currently doing a install of a block of flats fed from a bemco using 35mm aluminium split concentric cable low smoke.tested the cables and getin low readings of around 40 mega ohms on all between neutral and earth.1 cable is only 3 metres long.any one ideas why there so low
  6. S

    Checking loop tester readings from a sample socket.

    After calibration of my loop tester,I am considering using a socket in the house for future calibration checks and to connect various low resistances in series with earth via a rotary switch to give a range of readings,and if so what value of resistors?Thanks for any advice...
  7. S

    Insulation Resistance

    So i have db1 in 1 block of flats for communial lights etc, feeding db2 via a swa feed underground. Ir at db1 to test every circuit and submains 0.01Mohms. (N+L together to earth) Switch db2 off. All clear. Db2 also all clear when testing ir when investigating further. Any suggestions??
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