resistance

  1. E

    Winding resistance tolerances in three phase motors

    Hi guys, Is there a standard tolerance percentage that should be followed when checking the winding resistance of each coil on a three phase electrical motor? The general rule of thumb I followed when measuring winding resistance was that each phase winding had to be identical or close to...
  2. P

    Insulation resistance of Pink Fibre

    Hi there, Does any one know what kind of insulation resistance to expect for pink fibre wall/ceiling insulation? I'm trying to figure out if the cheap insulation meter I have is actually giving me a reasonable answer. here's a bit of background: I have a GFCI mounted in an electrical panel...
  3. D

    How do you disconnect neon lights in sockets while doing insulation resistance test.

    Hello everyone, I was just wondering how do you disconnect neon lights from socket outlets when doing insulation resistance test, as this will effect the readings, thanks.
    • David345
    • Thread
    • disconnect doing insulation insulation resistance insulation resistance test lights neon resistance sockets test while
    • Replies: 16
    • Forum: UK Electrical Forum
  4. dokkan1080

    Main Earthing conductor max resistance?

    I know main bonding to water and gas need to be 0.05 ohms But what about the main earthing conductor? Does it have a maximum resistance value from MET to the CU?
  5. E

    Resistance loads

    I’m having a mind blank. If there is no load in a circuit e.g L-N was bridged at a light. Then there would be a high fault current. What if there is only one light or load on a circuit with a low resistance. Is there a minimum load resistance needed in a circuit?
  6. B

    UK Insulation resistance whole board.

    Hi all. Changing a CU in an ex-council flat, pme system, no RCD's, and initially tried to IR test whole board L/N joined to earth, got a reading of 0.28 Ohms. Then did each circuit individually (2 X RFC, 2 X lights, 1 X cooker), L/N joined to the circuit's CPC, and got between 0.25 and 0.30...
  7. 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
  8. KeenPensioner

    Insulation Resistance zero Ohms

    Hi all. As I've said before, I'm not an electrician but an adult learner. I have a second hand Fluke 1653B MFT which is out of calibration but I use a CalCard to see how far out it is and it's not too bad. I've watched a thousand videos on EICRs etc and just want to increase my knowledge - if...
  9. timhoward

    Insulation resistance difference both ends of ring final cct

    Initial fault was RCD tripping, narrowed down to a ring final cct. IR tests on that cct with all loads removed were showing almost zero between neutral and cpc. So I broke the ring apart and eventually found the nail through a cable, and got that all sorted. Now its testing ok in as much as...
  10. J

    Insulation Resistance query

    When doing domestic testing, I spend quite a bit of time removing loads & vulnerable equipment prior to carrying out IR tests- allowing me to test between L - N without risk to vulnerable equipment or getting inaccurate readings. I’ve spoken to a number of sparks who go straight to testing L&N...
  11. cliffed

    Short circuit protection on high resistance on live conductors

    Thoughts on this scenario,obviously a short circuit fault situation
  12. K

    Low Insulation resistance test on smoke detectors

    Hi Everyone Just a question bothering me as you cannot do Insulation resistance test on smoke detectors as they can become damaged so obviously smoke detectors are sensitive but they are also installed on lighting circuit so if perform low insulation resistance test 250V between Live and...
  13. D

    Insulation Resistance - Low Reading on Ring

    Newbie Testing Question: I am getting a very low IR reading between L&N on a kitchen ring (0.01M). The ring was working fine with no tripping before testing. Can anyone shed any light on what may be causing this low reading? Thanks
  14. J

    Insulation resistance on new installation

    I have recently completed a rewire as part of a complete back to brick renovation in a pretty standard domestic property. Upon carrying out initial verification I uncovered a few strange IR readings. Multiple circuits with low(ish) readings of around 150-200Mohm. However they all tended to rise...
  15. D

    Is it ok to do insulation resistance test on RCBO at 500v?

    I know you are not supposed to do a insulation test on circuits that are protected by an RCD at 500v because it may damage the electronic components inside the RCD so that's why you switch the RCD off before you test the individual circuits, however, what if the circuits are all protected by...
    • David345
    • Thread
    • dead test domestic testing fault finding insulation insulation resistance insulation resistance test insulation resistance testing ir test rcbo resistance test test and inspect testers testing testing and commisioning
    • Replies: 6
    • Forum: UK Electrical Forum
  16. 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
  17. P

    The subatomic concept of amper, after hitting a resistance.

    I have a fundamental question about the current My question is: why after hitting the protons of a resistor and thus reducing the voltage and the speed of electrons; (voltage is the distance between the electrons which the distance is smaller than the balance between two electrons which do not...
  18. S

    Please help me with this Capacitor, SCR, low resistance coil problem!!

    I want to discharge capacitor in micro seconds, In order to to that I used very low resistance coil but When capacitor is discharged, SCR kinda blow up, meaning the positive & negative got connected together because of low resistance. What can we place in negative terminal to make sure that...
  19. S

    Low insulation resistance and tripping circuit breaker

    I've just done an insulation resistance test between line and earth and got 0.0 Mohms for most circuits. Obviously this is an F1, but what I don't understand is why the CB doesn't trip. Is the answer that the resolution on my tester isn't high enough? So I could for example have 0.049Mohms and...
    • shug1693
    • Thread
    • breaker circuit circuit breaker insulation insulation resistance resistance tripping
    • Replies: 20
    • Forum: UK Electrical Forum
  20. J

    Insulation resistance on modern installations

    On initial verification of new installations I have been having a hard time with insulation resistance. With RCBOs, fixed LED luminaires, intelligent dimmer controls and other sensitive equipment now the norm on almost all installations how do we overcome this and still carry out effective and...
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