conductors | Page 7

conductors

Recent contents View information Top users
  1. D

    continuity of final ring circuit conductors

    Hello, I am about to conduct my first initial verification and i have spent all weekend reviewing how to do the recommended tests. However I have a question regarding final ring circuit test. 1- is this only for a ring main circuit with outgoing line and incoming line? 2- if the answer is...
  2. C

    bonding gas and water how do you work out when to go up from 10mm to 16mm and so on

    were currently doing a job in massive old pub whats going to be a libary, my gaffer says put 10mm bonding to gas and water but how do you actually work out what size is required
  3. S

    Responsibility for installing Main Bonding Conductors

    Bugger that's supposed to say BONDING not BOINDING ! ----------------- I've been asked to install a new CU at my mother in law's. She has recently had a new kitchen installed where new lights, and extra sockets were added (circuit extended) for the fridge and (gas) cooker. These sockets BTW...
  4. Z

    Learner query on resistance tables for copper conductors and resistivity

    Hi everyone Table A.1 in Guidance Note 3 shows various values of resistance/metre for copper conductors at ambient temperature, including e.g: 18.10 milliohms/metre for one 1mm sq. conductor 0.387 milliohms/metre for one 50mm sq. conductor But these given values of resistance do not exactly...
  5. B

    Periodic inspection (EIC) report questions

    Hi all During r1 r2, ELI and PFC tests of a lighting circuit would it be a problem to leave lamps and ballasts etc in GN3 shows them out but I can't see a problem
  6. La Poste

    Testing the SELV

    Correct me if I am wrong but if we are to test a SELV transformer do we: 1. Join conductors of low voltage side of transformer together. 2. Join conductors of primary side of transformer together. 3. Test between these at a voltage of 500V look for minimum reading of 1 MOhm. 4. Test between...
  7. J

    Two Conductors in one MCB

    Hi Guys I recently passed my 2391 exams after a 4 week training course and then went on a 3 day Solar PV Course, so I got a lot of theory but zero practical experience which I rate higher than any manual or exam book. Coming across this forum I hope there are some kind souls out there as I...
  8. V

    room thermostat

    Hi, Question-A mains operated room thermostat requires three conductors to enable it to operate correctly. can you connect the thermostat to an existing two core and cpc cable and. A=Use the earth B=Use the earth and sheath with green and yellow C=Use the earth sheath with brown D=Not use at...
  9. C

    Current carrying capacities and vold drop for copper conductors

    Hi Help please with the above. Using on site guide Im stuck on Cc as I cant find rating factor for 42A type B breaker or is it 1? Many thanks Cider
  10. J

    fault diagnosis question, im stuck! :(

    if anyone can help i'd be very grateful. Q. when carrying out an insulation resistance test between live conductors of the socket outlet, a short circuit is discovered. a) describe how you would perform a test to determine the location of the fault within the damaged cable. b) describe the...
  11. M

    Main Earth and Main Bonding Conductors

    Need some advise, Carried out a Periodic Inspection on friday and the main earth conductor and the main Bonding to the steel was in fine stranded cable. Never come across this before and cant find anything in the regs to say if its wrong or not, so just wanted to check if anyone knows for...
  12. J

    Main bonding conductors

    Hi i was looking for some technical advice please. I have currently been asked to do work in a agricultural college to put a socket in a horticultural green house. The main college is supplied by a Scottish power transformer it is a TNS system,so the main bonding conductors are 25mm2. Now the...
  13. Amp David

    Doubling up conductors

    Is it an exceptable method to double up conductors in a 4 core cable to increase the CSA and then put in a seperate CPC? If so, then as there are no tables for doubled up sizes eg. 5mm, 8mm squared etc, would it just be a case of doing the calcs for the single core size then dividing by 2:confused:
  14. T

    3 Phase cable Identification

    Hi there. I’m currently preparing for my Am2. I’m a little confused on how to identify/mark three phase conductors. There is a 3 phase motor to connect up which is wired in 2.5 singles. I know the Phase colours are Brown Black Grey. My question is; if Black and Grey conductors aren’t available...
  15. M

    Distance Calculation to find fault

    Does anyone know or where to find the calculation you do to find a fault/break in a circuit that can't be physically traced.I'm sure i've seen it somewhere in one of my books but can't remember. Cheers
  16. W

    fault finding.....

    hi everyone newbie here... i have recently passed my part 2 technical course & 17th edition and want to move into domestic electrical services. i have done a few small jobs for people gaining more experience as i go. am waiting to do my test and inspect 2392 course, but have been asked to look...
  17. B

    Max loop reading using RCD

    How about this for a ponder..... Lighting circuit wired in metal conduit buried in concrete, conduit used as the earth no seperate CPC Replaced board reconnected conduit to main earth but readings are 45ohms obviously the conduit has broked down My question is this, before RCD's on lighting...
  18. D

    Multiple conductors connected to MCB's

    Visited chaps house today for work, and noticed in the CU the following cables connected to MCB's, previous occupier had CU fitted 14 years ago. Lights Downstairs - 3 conductors connected. They were for I presume, as I didnt run any checks, Hallway, living area and kitchen diner. RM...
  19. S

    Why 0.05 Ohms for main bonding conductors?

    Hi all, This has been bugging me for a while, so can anyone explain how we arrive at the value of 0.05 Ohms as the maximum acceptable value for resistance of main equipotential bonding conductors? Is there a calculation with 0.05 or less as the answer? Or is the idea just to keep it as low as...
  20. G

    Identification of conductors (appendex 11)

    Table 11a (osg) lists all the colour configurations for all standard cable types, this is straight forward. My question is :- When using 6243Y (flat three core & earth, Brown, Black, Grey & bare CPC). Which core would you sleeve as the switch wire and which one as the neutral when your using one...

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

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top