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  1. J

    MCB short circuit capacity

    6 amp BS EN 60898 .....6ka being the maximum fault current the device can handle, although the device may no longer work after that. The 3 underneath this being the fault current (ka) the device can handle without damaging it and then being able to be reset. I have been told 2 different...
  2. S

    IR testing problem

    Hi, I was doing some tests prior to installing a fan on a lighting circuit. IR readings L-E were dead short & N-E were a dead short, yet the lighting circuit works o.k. I have had this problem with energy saving lamps, when removed the circuit was o.k but this was giving 0.04Mohms at 500v not...
  3. i=p/u

    Short circuit current

    3.6v, 4 ah , em batt pack shorted in my pocket and burnt a hole in jumper, what current was flowing or was it the discharge , smokey, thx wise one
  4. N

    Insulation Resistance - Live to Neutral short

    Hi all, Just a quickie. I carried out an insulation resistance test on a lighting circuit which only has two rooms consisting of 4 lights. Live to earth and neutral to earth was fine but when I tested live to neutral I got a short circuit. All the bulbs were removed so just wondering if...
  5. M

    Prospective fault current ?

    Can somebody please clear up for me what is prospective fault current? Am i right in thinking its the value of overcurrent you get through fault conditions like short circuits and live conductors and exposed conductive parts ? Thanks
  6. S

    Pyro Cable Tripping RCD

    Went to a job in a church hall today where one of the power circuits was tripping the rcd. There seems to be 4 bad legs of pyro in the circuit, as I get a dead short in my IR tests between line/neutral, line/earth. Is it common for pyro cable to do this after a certain time, or could a fault...
  7. S

    Current carrying capacity of ring circuit

    I am happy with calculating current carrying capacity for straight runs of cable. I am not to sure how the imact of a ring effects the cable calcs? Its hard to see what the possible loads might be. As of this do you take the center point and use maximum demand? So for example on a 35 meter ring...
  8. B

    rcd short circut

    my rcd 30ma trips everytime i put the iron on, it lasts a couple of minutes then trips , all sockets and lighting trip ,so its a big inconveinience,, any advice would be a great help. thanx,
  9. M

    overheating motors

    Can a motor overheat and short to earth if it is having to work to hard?There is no overload but the motor is protected by thermistors and a thermistor relay which cuts out on occasions. Its an intermittent fault but the Engineers that have watched the circuit say it trips the Main C/B. On a...
  10. G

    fuse thingies

    Hi Can anyone tell me where I can get one of those little fuse thingies that goes inside a 13 amp plug top?? I want an 8 amp one. Thanks for your help. :)
  11. M

    IR Testing???

    Hi All- New to this - loving the challenges! EICR'd my house and found one of my ring finals had an IR problem- just getting to grips with testing and trying to gain experience- college was good, however, felt like it was more of learning to pass exams! My ring final has an issue- if i test...
  12. S

    Dead Short after IR testing

    Just had a call off my electrician (one doing council work) He did a CU change - on testing he IR tested the lighting circuit (500v DC) and got acceptable readings. When he energized the circuit - RCD trips. Found a dead short between N and E. Investigating now to locate which run of...
  13. A

    how do I khow what is short circuit capacity (KA) on DEIC

    HI Can anyone help me understand how I work out the "short circuit capacity(KA)" for Domestic Electrical Installation Certificate. Sorry struggling with this one.:blush5:
  14. E

    dead short L-N but the fuse doesn't blow?

    when doing an inspection i came accross a radial circuit serving 4 points, the IR between L-N @500V was 0.00 Mohms, on continuity between L-N I got 25 ohms. when I then energised the circuit and clamped the live, no current being drawn. I have yet to take any fronts off as it was just an...
  15. Guitarist

    Supplies to outbuilding CU's

    Do you guys think that the majority of electricians actually bother using the adiabatic equation to decide whether the cpc of a T&E cable is adequate when supplying a CU in a garage/shed, or do most people just size the cable based on CCC and voltdrop? I come across a lot of T&E strung between...
  16. B

    Circuit breakers short circuit ratings

    Hi im looking for a list of Circuit Breaker short circuit capacity ratings, that i can stick into my BGB. list required would be for all fuse types, from BS 3036 to BS88. old and new types protective devices. Also is there such a thing as fuse wire sizes gauge card? if so can some one point me...
  17. H

    A short introdustion

    Hi to you all, My name is Colin and I am a middle aged sparkie going down the grumpy old man route after looking at the state of our profession (Middle age is when a narrow waist and a broad mind always seem to exchange positions!!). I spent 8 years learning the job and the last 18 years taking...
  18. 1

    Bizarre dead short between Neutral and Earth

    Firstly, please let me explain the fault on the circuit HAS been rectified. This was achieved by splitting the offending circuit (kitchen ring) into two radials and putting each leg on their own 16A mcb on the same RCD. Attended a property to do some remedial works on the kitchen ring, New...
  19. C

    Moving CU all cable too short, acceptable method.

    Looked at a job today where the elderly occupants have the old rewirable fusebox tucked away high in a kitchen cupboard where neither of them can reach, or replace the fiddly fuse wire. They've asked me to price up replacing the CU with a split RCD unit but would also like it lowering so they...
  20. rustynails

    2392 Question - Balanced prospective short circuit current between lines

    The prospective short-circuit current between line and neutral is measured at 900A. The maximum balanced prospective short-circuit current level between lines, as a rule of thumb, can be assumed to be approximately: A: 0.9 kA B: 9 kA C: 90 kA D: 1.8 kA :banghead:

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