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  1. sparksburnout

    DNO's incoming capacity.

    Looking at a job where shower is required, and amongst all the other requirements, contacted the DNO to enquire what the incoming supply capacity is. The cut out fuse has no marking that states its rating, existing meter>CU tails are 16mm but will be using separate CU for shower circuit via...
  2. P

    Rated short circuit capacity of a BS88-3 type C fuse?

    What is the rated short-circuit capacity of a BS88-3 type C fuse? They are typically manufactured to 80kA but what does the BS say?
  3. W

    Repair after electrical short, need help

    We had an electrical short in our dishwasher which I'm 99.9% sure was caused by a faulty power switch, which you can see pictured. I've since bought a new switch, but as I have absolutely no electrical knowledge/qualifications at all, I'm trying to work out what to do with the cable connectors...
  4. W

    MCB tripping time for 153.37A Short circuit L-N fault for 16A Type C MCB??

    I'm a qualified spark but studying building services engineering at uni and just need a little bit of advice to see if I'm going wrong. Trying to answer a question where we have a 16A Type B MCB, and a short circuit fault current of 153.37A. From fig 3.4 of regs we can see that for a fault...
  5. G

    Dead short between 3 conductors

    What reasons can anyone think of why a circuit would have a dead short across all 3 conductors ? so far I'm thinking - water damage - possible rodent / pest damage any more ?
  6. GMES

    In defence of the short course trainee part 2 Marvo

    Only kidding, as it been a week already :rofl::rofl::rofl::rofl::rofl::rofl::rofl::rofl::rofl:
  7. D

    Short distance PIR, Danlers??

    Evening all, 1st fixing a job at the moment and the client is having 6x LED Aurrora sola IP65 down lights installed in the soffit at the front of the house, the road is less than 3m from the front door and soffit obviously, they want them to be triggered by a sensor, so i suggested fitting a...
  8. 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...
  9. 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...
  10. 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...
  11. 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?
  12. 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...
  13. 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...
  14. 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...
  15. D

    Dead Short?

    What test will I find a dead short in? Continuity?
  16. 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...
  17. 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...
  18. 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.
  19. 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...
  20. 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...

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