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  1. J

    BS 1361 main fuse short circuit capacity/overload at ka ratings explained.

    Hi. I am an apprentice electrician, and was wondering if anyone could help me as I'm getting confused with something that's probably quite simple. If I am correct to work out the amps running though an appliance you do w/voltage. So 10kw/240v = approx 42amps. Of I'm correct in this? My boss...
  2. P

    Short Courses and QS System amongst concerns of DCLG Commons Select Committee

    As some may (or may not) be aware, on 6th Jan 2014 five electricians and the Scheme operators gave evidence before the DCLG Commons Select Committee : Player The Committee clearly have serious concerns regarding : 1. Electrical scheme members using "short courses" as a means of entry to...
  3. S

    Fluorescent fault overcurrent trip?

    4ft old style starter/ballast type fitting which when powered does nothing at all (not a flicker) but trips the 6A/30mA RCBO after maybe 3-5 secs. I didnt have my clamp meter with me when i went to see the fault but assume due to the time delay that its the overcurrent part of the RCBO rather...
  4. R

    Mind the short circuit!

    Anybody ever taken note of the risk in trying to change the direction of run of a motor running in star-delta mode?
  5. Pete999

    Short tails

    Hi I've heard lots of talk on forums regarding what one person described as the three meter rule, with regard to the size of cable required, (for example a 500a busbar sysem, and a requirement for a smaller supply taken from these busbars) should the cable from the busbars to the new switch...
  6. B

    Where to get short lengths of Polyduct?

    A customer is getting a new supply and we need 5m of 32mm polyduct. Trouble is I can't find anyone local willing to sell me short lengths. Jewsons are the recommended supplier by SSEPD etc but sell 25m rolls only. Does anyone know of a supplier in the north east hampshire, surrey, berkshire...
  7. K

    Relationship between Cut-Out Fuse & MCB PSCC

    Good morning all, Apologies if you have gone over this a number of times before (I have tried searching for a thread, and have found some that have touched on what I'm after but not quite explicitly enough). If the measured PFC is greater than 6ka (for example) with circuit-breakers' breaking...
  8. D

    Dead Short?

    What test will I find a dead short in? Continuity?
  9. H

    New Zealand "live" short circuit

    Hi all, I'm a translator, translating a Portuguese text into English that includes a list of electrical faults. One of those is described as a fault that occurs when you connect two positive poles in a circuit. What is that called in English? The literal translation of the Portuguese term is...
  10. B

    IR testing

    When IR testing on lighting circuits i keep coming across dead shorts between L+E and N+E on the same circuit. I then proceed to investigate and the faults clear (maybe a screwed neutral or something ). however im scratching my head as to why im getting dead shorts between L+E when the mcb...
  11. J

    Short circuit capacity & max zs

    Hi all. I tested a building last week where they had used bs 3871 and also bs 4293 rcbos/mcb's. I can't seem to find the ka of these and also the max zs permitted.
  12. D

    Advice or job hope

    Hi all, I'm a 21 year who just returned for Australia, I served a 3 year apprenticeship and also have one year of been fully qualified, I have my 17 th edition regs and also passed my 2391 inspection and test. I'm from the gloucester area, please could you give me advice on further course or job...
  13. L

    Insulation resistance Live to Earth on lighting circuit dead short

    Hi all, Tested a lighting circuit recently and got live to earth dead short and neutral to earth dead short on insulation resistance all loads were still connected there was a fluorescent fitting on the circuit and signs of green goo in switches and ceiling roses and the MCB was not tripping. Do...
  14. 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...
  15. 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...
  16. 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
  17. 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...
  18. 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
  19. 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...
  20. 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...
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