value

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  1. R

    Ze of TT system and Zs value.

    Evening all. Iv come across a problem. I'm going to change a d.b. The earthing arrangement is TT system with a 10mm cpc. Water and gas bond is 10mm also. My Ze when the main earth Is disconnected is 59.1ohms which as we know is fine. When taking zs at socket outlets I'm getting a value if...
  2. P

    High Zs Reading on Megger MFT 1552

    Can somebody help me please? I'm just finishing a rewire, and I've installed a GF radial cicuit in a large domestic property and am in the process of testing it. It's a new radial circuit, 2.5 T&E, 13 sockets, 20A type B breaker on an RCD protected board. My R1&R2 = 1.40 and Ze = 0.20, so my...
  3. A

    Adiabiatic & voltage drop

    Hi all, been trying to work this out now and carnt get my head round some of the calculations. please see where im going wrong. voltage drop: so 63amp mcb supplying electric boiler, run is approx 25 meters in 16mm twin & earth. so Mv/a/m x length x amps divided by 1000= 2.8x25x63 divided by...
    • aaelectric
    • Thread
    • earth equation meter value voltage voltage drop volts
    • Replies: 28
    • Forum: UK Electrical Forum
  4. Z

    Max Zs value for TT distribution circuit (NOT Final circuit!)

    Apologies if this question sounds a bit basic but am a little confused at the mo and quite new to the game. Here goes - I am trying to complete a NICEIC Highway Installation Certificate for a system where there is a 230 v TT supply coming into a roadside pillar into the main BS88 fused head...
    • zak325
    • Thread
    • circuit distribution final max supply times value
    • Replies: 20
    • Forum: UK Electrical Forum
  5. P

    Circuit design - SWA R1+R2

    Hi all This has got me thinking. I am designing a circuit using 3 core 2.5mm SWA and using table 11 in the OSG on page 182. With an R1 of 2.5mm and the same for R2 I know what the milli ohms per metre is. That's all well and good but I also know from experience that when uisng the armour as an...
  6. D

    Some help for course work info needed

    Hi there, I am new on here,Great place ! Can someone explain to me how to do an earth continuity test and earth loop test on an electric cooker where the cooker point is already installed. Our college tutor has asked us to find out the info for next weeks lesson ,where we will be asked...
  7. A

    Voltage drop

    Hi i keep getting confused when trying to work out voltage drop please can some one point me in the right direction. 63amp boiler supply 25 meter run in plastic trunking fixed to wall. Will 16mm twin and earth be sufficent and can someone show the calculation cheers
    • aaelectric
    • Thread
    • boiler cable conductor current value voltage voltage drop volts
    • Replies: 7
    • Forum: UK Electrical Forum
  8. S

    PFC on Megger 1553

    Playing with my new Megger MFT1553. Done a test of PFC on my home installation. Firstly I connected the to the neutral bar and the incoming line conductor at the switch and got a value <1A. Think I must have connected it wrong and got parallel paths?? Hope I have not blown any appliances in the...
    • SKY
    • Thread
    • megger neutral pfc reading switch value
    • Replies: 4
    • Forum: UK Electrical Forum
  9. K

    Power One 10.0 - V/M Value

    Anyone know what the V/M reading on a PowerOne 10.0 inverter refers to? We have one causing a few problems and it says V/M G82. Initial thoughts is that it is not set to G83.
  10. S

    ZS Value

    :6:Might be a silly question but .... Would increasing the length of a cable increase or decrease the loop impedance (zs) of that circuit? Thanks
  11. Toby Kuhnert

    MAX Ze value for TT?

    Hi, I'm in my second year at college, but I'm a bit unclear on what the max Ze should be for a TT system. I know that the regs say 200ohms, and my tutor said that it would be acceptable if you found an earth rod which gave a reading of 200ohms. However several of my mates who have been qualified...
  12. F

    tripping value

    got a keen apprentice who never stops asking questions which is good but not on a monday morning when you dont feel to clever anyway he was asking me how low would your ir reading have to be to trip breaker i explained that min value was 1M ohm but he wanted to now how low the reading would be...
  13. D

    higher Zs with RCD

    When testing Zs for circuits which also have RCD protection, what figure do you record onto your test sheets? when you exceed the max value for a specific MCB, due to the rcd. Do you just use a calculated value or do you actually record the value that you get even though it exceeds the max...
  14. A

    Find the Value of Resistor R Please

    So Im hear doing some homework and I cannot figure how to find the value of resistance r in both of these diagrams. Can someone show me the formula pls. You can click to enlarge them. Thanks. Diagram 1 Diagram 2
  15. A

    Determine the new current value

    Hi all. Freshman electrical installations student here. Please can someone help me with figuring out the formula to the following question, it's driving me nuts. The current through the field windings of a motor is 1.8 amperes when the resistance is 100 ohms. After 5 minutes the resistance...
  16. S

    Measuring Ze value??

    Hi can anyone give me a procedure to measure the Ze value of a house? I am currently studying to become an electrician and I am very much a rookie so please be patient with the baby step questions :-)
  17. R

    why a low earth fault loop impedance

    hi guys, Just wanted some help with some course work for college. Any help is greatly apprecitaed. Why should a low value earth fault impedance should be achieved for all circuts? thanks
    • Ryan Kavanagh
    • Thread
    • current earth earth fault loop impedance fault impedance loop loop impedance value
    • Replies: 19
    • Forum: UK Electrical Forum
  18. S

    What KVA value - Can someone help please for a tyre garage, MOT station and offices

    Hello all I am new to this site and i am glad i have found it as it looks crammed with useful advice from people in the know. I am not too familiar with how forums and posts work and i hope i have not made a mistake by uploading this, so please excuse my ignorance in advance if i have offended...
    • shafeeqg
    • Thread
    • canada garage help help please kva please someone station value
    • Replies: 1
    • Forum: Canada
  19. B

    Three Phase Value

    For 230 volts x 1.732, use 398....hi to all my fellow electricians. Kind you explain me what is the 398 answer from the given voltage. Thank you!
    • Bosscap19
    • Thread
    • aus phase three three phase value
    • Replies: 10
    • Forum: Australia
  20. La Poste

    TT testing.

    If testing a TT installation which tester would you prefer? The Earth resistance tester or an earth fault loop impedance tester. I mean if you were to test with an earth resistance tester (the inserting spikes in the ground test) and get a value for Ra, would this value be the same value that...

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