impedance

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  1. C

    L-E fault always trips mcb?

    Hi, i am studying my 3rd yr 2330 and soon to do my fault finding, and was wondering if you had a L-E fault if the mcb would always trip or if just the rcd would trip sometimes on a 17th edition board?
    • caterhamboy
    • Thread
    • always earth fault impedance mcb trips
    • Replies: 3
    • Forum: Australia
  2. L

    The value of Ze on a TNS system useing an earth loop impedance test Instrument

    The value of Ze on a TNS system useing an earth loop impedance test Instrument list the steps in the procedure and the reasons for each step, I think this is right ? 1.Select appropriate test Instrument - It needs to be able to read Ze (low ohms resitance metere ?) 2. Perform safety check (...
  3. W

    impedance

    hi guys, what are the main reasons for a high impedance readings and what the best way to lower your impedance
    • wolfiehogan
    • Thread
    • impedance
    • Replies: 3
    • Forum: Australia
  4. 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
    • circuit connections earth final impedance loop loop impedance measured neutral parallel
    • Replies: 8
    • Forum: Australia
  5. L

    Things I cant work out

    When the emf in a conductor 0.15m long moving at right angles through a magnetic field, at a velocity of 2 m/s is 0.5 V, the magnetic flux density would be I know the answer is 3.17 T but i dont know how to work it out If a resistive and capacitive circuit has an impedance of 3 Ω and a...
    • lofty84
    • Thread
    • arial electrical work impedance out power resistance things work
    • Replies: 11
    • Forum: Electrician Forum
  6. S

    Measuring electrode resistance to earth using loop impedance tester?

    I'm going to be fitting a new CCU where the earthing arrangements at the property are TT. Obviously I will need to measure the electrode resistance to earth and as I don't have an earth resistance tester I was hoping to do it as described below. I assume the result is the number I enter on the...
  7. M

    Earth Fault Impedance

    Can some one help sharing an example on how Earth Fault impedance can be calculated for an underfloor busbar. After testing the earth fault impedance for the circuit it is showing higher impedance than the max value. Thanks
    • m00se75
    • Thread
    • circuit earth fault impedance
    • Replies: 9
    • Forum: Australia
  8. T

    Earth Fault Loop Impedance Ze test at origin

    Hi, I have a my am2 practical testing exam next week and I'm confused about the earth loop impedance test. The centre use a three lead instrument, I just want to know if this is right. Connect the third lead to the neutral bar, and connect one lead to the earth bar Then measure over the...
  9. J

    Wierd no trip impedance value

    Whilst testing the earth loop impedance on a circuit in a church the value given by the regular loop test is 1.74 but when doing it on non trip (with the neutral lead connected) we got >200. Has anyone any ideas on what could cause that? Thanks
  10. V

    Earth fault loop impedance

    Can somebody help me on how to test the earth fault loop impedance(Zs) of the following circuit Cooker,Immersion,motor .i have tried but the tester display :confused:
  11. B

    Loop impedance

    I was doing a Ze test today with my 1651 fluke and it was reading >2000 ohms. The main switch was isolated and the earth disconnected. I had the green probe crocked onto the TN-S clamp on the incoming main, the blue on the neutral bar and the red on the supply side of the main switch...
  12. L

    Testing Question!!!

    What is the difference between Ze and Zs??? As far as i thought i knew Ze is the circuits earth loop impedance and the Zs is the installations incoming loop impedance??Real confused?!?!?!
  13. D

    loop impedance

    Hi All Hope you can help me with this one, how would i calculate loop impedance on single phase and three phase generator :rolleyes:
  14. M

    impedance question

    A Capacitor of Capacitive Reactance 50 ohms, an inductor of 80ohms Inductive Reactance and a Resistor of 40ohm are connected in series to a 200v 50 Hz supply. The impedance of the circuit will be? i know the that z= square root of R squared + (xl - xc)2 but i cant seem to work this...
    • matt12321
    • Thread
    • impedance question
    • Replies: 1
    • Forum: Australia
  15. D

    total circuit impedance????

    if anyone could help me with this i would really appreciate it. Q. A series a.c circuit has a resistance of 3ohms and an inductor of 0.0127 H connected across a supply frequency of 50hz. What it the total circuit impedance? the answer is 5ohms but i have no idea how to work it out...
  16. J

    earth loop impedance test

    Hi I must admit it has been years since I did this test State two conditions which were confirmed by the test instrumement before the Loop Impedance Test can proceed?
  17. C

    High earth impedance

    OK - discovered yesterday (when British Gas came to install my new boiler) that the earth is very poor, up near 100ohms. So I then start thinking and remember that the water pipe is now plastic and the earth comes from the water pipe. So, first of all can I confirm what type of earthing...
  18. H

    Is there any point testing earth loop impedance

    In a tt system? The earth spike is Reading greater than 50 ohms so clearly the mcbs won't make their rated disconnection times. Waste of time?
    • hoover
    • Thread
    • disconnection earth fault impedance loop loop impedance measure point reading testing
    • Replies: 20
    • Forum: Australia
  19. C

    Impedance

    How do you do a test to find your impedance
  20. P

    loop impedance calculation

    hi i am doing 2330 and we have been given some calcs to do but the handouts they give are pretty poor i've had a go at the first one but need someone to tell me if i'm going wrong ( A downstairs lighting circuit of 90 metres is to be wired in 1mm thermoplastic (pvc) twin & cpc with an over...

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