measured

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  1. Les Macaulay

    No live testing except where it's a must

    Do you agree that we only should be working dead when establishing the Zs for final circuits other than socket outlet circuits? That is, don't use the line, neutral and earth probes of the E/L tester except for Ze and Ipsc. Simply add R1+R2 to Ze.
  2. S

    testing measured or calculated

    Hi guys, I have my part p assesment in about 4 weeks. I have a kewtech kt61, it does everything i need it to apart from pscc. Will i be required to perform a manual pscc test or will calculating it be acceptable? As my tester doesnt do it. Thanks
    • sima24
    • Thread
    • calculating measured neutral testing voltage
    • Replies: 9
    • Forum: UK Electrical Forum
  3. S

    Max Measured Zs

    Hi All On the test cert I have it asks for max "Measured" Zs. With my megger 1552 I can do this at socket outlets using the no trip loop test and the plug lead. On a radial circuit what lead combo do I need to use? I'm guessing its a 3 lead test on L N E at the furthest point of the circuit...
  4. R

    Lighting Circuit Zs

    I must be confused about some wording, Light circuit R1+R2 is 1.84 Ze measured = 0.28 So if I do Ze +(R1+R2) I get 2.06 Maximum Zs allowed is 6.14 actual measured Zs is 0.88 This measured Zs is much lower than the max value, I know higher is not good but lower Zs leads to any problems ??
    • rigby
    • Thread
    • batteries circuit earth lighting lighting circuit measured you're you've
    • Replies: 17
    • Forum: Lighting Forum
  5. V

    inspection & test, disconection times & maximum zs allowed

    Hi, on a tn system, 238vs, would the disconnection time be 0.4s or 0.2s, i thought as over 230vs it should be 0.2s, but working with another engineer who disdagreed & pointed out tables in bs7671 show 0.4s to 5s? Also when completing certs should you include the 80% or not in the maximum...
  6. L

    Prospective Fault Current

    Hi Guys, We measured PSCC on a three phase dist board in a commercial establishment. This board is fed from a main switch board with a main 400Amp switchfuse with BS88-2 fuses rated at 88kA. Feeding a second 160Amp switchfuse with BS88-2 fuses protecting the cabling to the board we were...
    • LearnerDave
    • Thread
    • calibri canada current fault fault current measured
    • Replies: 3
    • Forum: Canada
  7. M

    ce certificate for led's

    Looking around for gu10 led replacements. Obviously I know that ebay can hardly be described as a recognised distributor but they do have many sellers of and a wide variety of led lights. Apart from the normal worries about buying from such an 'outlet', I am concerned that the lumens figures...
    • mhar
    • Thread
    • aus bulbs certificate energy led led's measured output
    • Replies: 6
    • Forum: Australia
  8. R

    Ze+(R1+R2) is lower than measured Zs

    Hi All, Currently in the process of my NIC application. Completed one job and had it signed off. Just installing a socket at home on its own circuit directly under CU. Going through my test results cant understand the difference in readings. Measured Ze is 0.12 Measured R1+R2 is 0.01 Was...
    • rob121
    • Thread
    • aus lower measured
    • Replies: 6
    • Forum: Australia
  9. 0

    "Comment on the measured values obtained" <<<< Can you help me please?

    Hi, above is a picture of some measurements I have taken, and there is a task underneath it that asks me to "Comment on the measured values obtained". I'm not really sure WHAT it is I have to comment on, could someone help me out please? Thanks a lot. :)
  10. F

    testing

    two lighting circuit, one upstairs one down stairs, both on serparate rcds when i test down stairs at the last light for zs not a problem, when i upstairs at the last light, just beeps but doesnt give me a zs, why is that?
    • fire
    • Thread
    • aus circuit fault first measured testing
    • Replies: 5
    • Forum: Australia
  11. O

    measured Zs to high

    Hi all please can someone assist me i have measured Zs at the end of a lighting circuit Zs 1.48 Ω and the mcb is 1.44Ω so it fails. But checking appendix 14 the equation... Zs (m) < 0.8 x Uo / Ia = 0.632 Ω passes. Am i missing something please can you advice new at this need all help i...
  12. O

    Resistance between Line and Neutral on a final ring circuit

    Hi After a bit of advice: I am just doing a bit of home testing prior to starting my 2391 later this month, but have come across a couple of strange results. Measured the R1 and got 0.98, also got the same for the Rn so not a bad start, but got 1.95 for the R2. I tested it a few times as I...
  13. T

    Zs, R1+R2 Measured Values?

    When testing its always been said that its important to take your Continuity reading (R1+R2) and that Zs can be calculated (avoiding working live) So how many of you do all your correct R1+R2 values and then claculate there Zs and put this figure down on your test sheets? Or are most of you...
  14. A

    excessive earth loop impedance on final circuit

    Hi. This seems like a newbie question but please help. Received the test results with an 'excessive earth loop impedance' on one final circuit. Circuit originates with a 32A MCB and serves 10 socket points. Wiring is 2x2.5mm live, 2x2.5mm cpc. Max Zs = 0.72 Ohm. r1 (line) = 1.68, rn (neutral) =...
    • AmeliePoulain
    • Thread
    • aus circuit connections earth final impedance loop loop impedance measured neutral parallel
    • Replies: 8
    • Forum: Australia
  15. Johnuk

    hello all i got a question on a testing question

    am looking at the question and am a bet lost now on answering it..... The maximum permissible values of earth fault loop impedance for three circuits are 1.44 Ω, 0.92 Ω and 7.67 Ω. If the measured values for these circuits are 1.25 Ω, 0.68 Ω and 6.22 Ω, determine if the measured values are...
    • Johnuk
    • Thread
    • aus circuits given hello measured question testing values
    • Replies: 4
    • Forum: Australia
  16. Amp David

    Measured Zs up the swanny?

    Did a Zs on a lighting circuit today and the value was less than my calculated value. Haven't got my note to hand so can't give the exact figures. Thought it could be supplementry bonding somewhere, but there isn't any. Can anyone shine a light on the matter:(
  17. S

    ZE at board/earthing alternatives

    Hi there... Couple of questions for you experts. Still learning.....:o Been to a factory today... It has one main incoming board and 55 distributon boards scattered around there factory... They asked me to fit/wire a couple of socket outlets under one dist board. Which only uses the...
  18. D

    Measured and calculated Zs

    Can anyone tell me how I could have from my dead test results for a lighting circuit obtained a value of R1+R2 which is greater than my live test Measured earth fault loop impedance for the same circuit. According to the equation Zs= Ze +( R1+R2) that should be impossible. Any help...
  19. S

    Reliability of measured Ze for Zs calculations

    Afternoon all. Re-doing my calculations for a hot tub supply after client upgraded the specs. Details are: Hot tub rated at 16A. Supplier advises to use Type C breaker to handle inrush when pump starts. 26m from CU to Hot tub via rotary isolator switch. I was proposing to use a 20A Type C...
  20. C

    Zs - Calculated and Measured Differences

    Not too sure what to read into this!! New installl in my garage and doing initial testing Socket Circuit ( radial ) R1 + R2 = 0.03 ohms using link method in CU R1 + R2 = 0.03 ohms measured Line and CPC individually ( done this just to double check ) R1 + R2 = 0.07 ohms - of SWA from CU in...

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