impedance

  1. T

    Break in ring circuit

    Just has an electrician do an EICR on a domestic property and he detected a break in continuity in the kitchen which as 6 double sockets - one of which supplies the dishwasher. The cooker is on its own MCB. All sockets test OK with a Martindale simple socket tester. He sensibly down rated the...
  2. M

    Megger 1533 showing phantom voltages on Ir and Impedance

    Hi! Some help would be appreciated! I've just moved into new house, wanting to check insulation resestance etc as getting some nuisance tripping, this bits not important. Got my megger out, which has worked perfectly up until now, it doesnt have a test cert, but I'm not fully qualified and...
  3. S

    UK Amtech/Trimble - Excessive Earth Loop Impedance on SWA cables

    Hi All, I'm new to Amtech/Trimble and I've been asked to review a model. I'm looking at circuits that are SWA cables using the armour and an internal conductor as the CPC. There are various earth loop impedance errors listed where the Zs at the load end is too high, but what I can tell, Amtech...
    • Steve W
    • Thread
    • cables cpc earth earth fault loop impedance impedance loop loop impedance swa
    • Replies: 4
    • Forum: UK Electrical Forum
  4. M

    G99-SGI-3 4.4 kw set export limit phase to neutral loop impedance test on site

    G99 SGI-3 4.4 kw set export limit phase to neutral loop impedance test on site 0.309 ohms and dno max being 180 m ohms or 0.018 ohms so site reading are well over the top or is this not unuall for 1950 lead cable TN-s
  5. H

    Loop impedance calculation

    Hi all , The measured value of loop impedance for a circuit is 2.4Ω. If the temperature at the time of the test was 20°C and the cable is 70°C (factor 1.2) what is the corrected value. Ze = 0.4Ω: the answer that I got is 2.8 but according to my calculations it would be 2.88 ohms follow up my...
  6. D

    Loop impedance and equipment cables

    Two related questions in 1, if anyone is up for helping! (i) When electricians install supplies, is there anything in the regs that says how many milliohms they need to include for equipment cables? I have been told "no", that the loop impedance is only up to the outlet. Now I am an R&D engineer...
  7. P

    Mains cable surge impedance

    A short while back @marconi asked for the surge impedance of some 25mm SWA, so here are some related measurement results. For those who don't recognise the term, "surge impedance" is the same as "characteristic impedance" as in the 50 ohm cox cable you see advertised. It can best be explained...
  8. J

    Loop impedance measurement

    Hi, All I have a megger LTW325 and fluke 1664FC to measure loop impedance by using high current mode. But both results are quite different. megger LTW325 is given a value 0.04ohms and fluke 1664fc is given a value 0.12 ohms. Means megger can give a current at 230V/0.04=5750A but fluke is only...
  9. J

    UK Earth loop fault impedance help

    Hello I’m a student learning about industrial wiring and circuits and we’re about to start learning about how to do loop impedance calculations. I have made a drawing of a three phase installation and was wondering if anyone could give me information on how I get the Ze Zs and R1 + R2. How would...
  10. E

    Loop Impedance reading

    Hi I bought a holiday lodge last month and decided to test the circuits to see how they measured. The lodge itself is fed from a central point in the holiday village by a 16mm PVCSWA. The main earth wire terminates into a MET it looks to be a 10mm earth that is crimped onto the incoming earth, I...
  11. T

    Fault loop impedance testers

    Hi just wondering how most are testing fault loop impedance and which testing units are best
    • Tony hu
    • Thread
    • ausie elec fault impedance loop loop impedance testers
    • Replies: 1
    • Forum: Australia
  12. E

    System Impedance

    Hi Guys found this in a Ariston 9.5kw Water heater instructions quote ''The product should be connected only to a supply with the relevant system impedance no more than 0.237 ohm. Restrictions to connection may be imposed by the supply authority on the use of equipment in the actual...
  13. H

    how would i calculate resistance using Vcc, input impedance and logic-high threshold?

    • Hamzah712
    • Thread
    • calculate elecrical design electrical electronics impedance input resistance using
    • Replies: 3
    • Forum: UK Electrical Forum
  14. R

    The measured value of loop Impedance for a circuit is 2.4 Ohms

    Hello trainee forum thank you very much for letting me in here and as a consequence hopefully helping me to develop my skills and knowledge. I'm currently focusing on the 2391 and have enrolled myself on a course with no previous Inspection and testing experience or Knowledge so I do feel kind...
  15. C

    A coil of inductance 0.1 H and resistance 40 Ω is connected to a 230 V 50 Hz supply. Determine

    A coil of inductance 0.1 H and resistance 40 Ω is connected to a 230 V 50 Hz supply. Determine, showing all calculations, the impedance of the circuit. Anyone help me I don’t want the answer just a guide
  16. mak

    Is there a max Zs for lighting circuits?

    I can't find anything related to this in the regs so I probably misunderstood the question. The way I see it the max Zs for any lighting circuit depends on the circuit breaker for that circuit. Say we have a lighting circuit with 100x36W ceiling lights which gives us a load of 16A, we choose the...
    • mak
    • Thread
    • circuit circuits confused earth fault impedance lighting loop loop impedance max radial types
    • Replies: 7
    • Forum: UK Electrical Forum
  17. Mark Wright

    Max Earth Fault Loop Impedance for OverCurrent Devices Before Amendment 3 and Now???

    Maximum Earth Fault Loop Impedance for OverCurrent Device was calculated 230/(MCB Rating*5) * Rule of Thumb is that correct? And how are they worked out now after Amendment 3?
    • Mark Wright
    • Thread
    • amendment before devices earth earth fault loop impedance fault impedance loop loop impedance max overcurrent
    • Replies: 5
    • Forum: UK Electrical Forum
  18. H

    Working out the impedance of a circuit

    Hi Guys, Just wondering if anyone can give me a nudge in the right direction on how to work out the impedance of a circuit. The values I have to work with are that its and 230v ac inductive load circuit with a phase angle of 40 degrees and a resistance of 14 ohms. I read and re-read my text...
  19. M

    Loop Impedance tester electrical circuit

    Hi A quick one I was wondering if anyone knows how a multifunction tester performs a loop impedance test. I understand how to perform a test and what the results of a loop impedance test give you in working out your PSCC and earth fault current. I use my Fluke multifunction tester every day at...
  20. R

    Testing Loop Impedance through RCD.

    Hi, installed some circuits in a factory. The circuits were tapped off of a busbar that goes straight to the main switchgear. From this I installed a Chint RCD, which then goes to 2x Chint TP MCB and 1x Chint SP RCD. One of the TP MCB´s goes to red commando sockets and the SP MCB goes to blue...
Best EV Chargers
Best EV Chargers by Electrical2Go! The official electric vehicle charger supplier.

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Advert

YOUR Unread Posts

Advert

TrueNAS JBOD Storage Server

UK Tiling Forum | Tilers Forums
UK Tiling Forum by Tilers Forums UK
Plumbers Forums | Plumbing Advice | Gas Forum
Electrician Tips from Professional Electricians
JBOD Forums: a forum for JBOD storage server advice
JBOD Suppliers: JBOD Storage Server Supplies
Back
Top