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  1. J

    Tns main protective bonding conductor csa

    its is 100% an tns system, there are two supplys to the lv panel,2x630mm per phase then a single 630mm for the neutral, and a seperat 240mm single as the earth all of tis again for othr supply ,, both earths on the supply tag onto the integral earth bar inside the panel, then off the earthbar...
  2. J

    Tns main protective bonding conductor csa

    its is 100% an tns system, there are two supplys to the lv panel,630mm per phase then a single 630mm for the neutral, and a seperat 240mm single as the earth,, both earths on the supply tag onto the integral earth bar inside the panel, then off the earthbar,, designer has said 2x240mm onto our...
  3. J

    Tns main protective bonding conductor csa

    Hi just checking the main protective bonding conductor size on a tns system, there are two supplys the tails sizes are both (630x2 the supply earth is 240 and neutral is 630x1) persupply designer aspecified main erthing conductorto met fothe main protective bonding as 2 x 240 i think this i...
  4. J

    fault today at work 400v live to neutral

    my appologies the section panel is proteus I was using the term mini-form,, it's not your usual section panel filled with 60947-2 mccb's there bs 88 so thought that's were called miniforms,, thinking bout it miniforms have the sliding fuse tray,, but this section panel Engadget on to the neutral...
  5. J

    fault today at work 400v live to neutral

    The lights flickering,,not 100% but presume is it down tothe frequency of 50hz and the sin wave of using the three phase system as a path back to thetransformer,,but i know why they wer still working because of the path down theneutral back to the neutral bar up the neutral of a circuit on a...
  6. J

    fault today at work 400v live to neutral

    I got to the bottom of this today,, i got to site today andswitched on all the lights and as soon as i put, the zip boiler on the lightswent back to flashing, so with my new found knowledge, shut of went through thetest voltages, L1-N 400,L2-N 400,L3-N 400,,,,N-E 230,,L1,2,3 –E 230,, turnedoff...
  7. J

    fault today at work 400v live to neutral

    Its not quite as simple as that its not like your usualswitch fuse,,, this sw fuse is on the essensial side of a proteus dual supplysection panel (miniform),,the switch fuse is 4 pole and when engaged pulls backon to the bus bars,,i work for a decent sized company but its something we don’toften...
  8. J

    fault today at work 400v live to neutral

    who would usually overhaul the sw-fuse an outside company or would u normally do it by one self and the other sw fuses that iv not used yet how would u best test them for the same fault
  9. J

    fault today at work 400v live to neutral

    in its current state thers not much load on the db yet,, next year other phases start in the hospital and we will be loading the board up more then,, but the voltage seems stable,,, so wat would be a volt drop indicating a poor connection under full load verses a decent conection under full load
  10. J

    fault today at work 400v live to neutral

    You could say that about anything we do,, I want the advice straight up, I don't want scareing
  11. J

    fault today at work 400v live to neutral

    can I certify the job with this looming
  12. J

    fault today at work 400v live to neutral

    if my l-n loop reading are coming back at 0.05 on all phases would u say that's a safe bet the fault has cleared
  13. J

    fault today at work 400v live to neutral

    why did this have to happen on my job, ive go five other conections to make on to this sction panel,,to remove the sw fuse would be no easy task
  14. J

    fault today at work 400v live to neutral

    I think the cause was a sw fuse on the old section panel,, the sw fuse has never been used and is from the 1970's so I think it was just poor contacts,,, once it was turned on and off a few times the fault cleard,, how else can I ensure that was the cause ive never come across the fault before...
  15. J

    fault today at work 400v live to neutral

    went to work today, on a hospital we’ve been working atand we got there and a phase of works that we’ve have already done I tested itan powered it up last week, the lights were all flickering and one light sw onone circuit was switching another light on another circuit very strange, I tookthe db...
  16. J

    eicr on premsis with no rcd

    its my dads business, I want to do wats right and least costly but it im, see all I usually do is report back recommendations to the office, and they take it from ther but this is a good opportunity for me to delv alittle deaper into the regs and learn something aswell,,eeb earth equipitential...
  17. J

    eicr on premsis with no rcd

    well I thought your methods of fault protection were eebads if thers no rcd protection,, and ads no rcd protection if its fully contained exept for socket outlet or if its monitored by a competent person
  18. J

    Jtl or college

    yep Im rough its taken me a gd few years and plenty of practice lol
  19. J

    eicr on premsis with no rcd

    not sure yet im going to the job Monday all I know is its a dental surgery, with no rcd protection an any circuit gas is bonded and so is water,,need to check special locations yet as to if its classed as a medical location,, but because its not to current regs either ensure cross bonding is...
  20. J

    Main earth bond commercial..

    544. says with tail size greater than 150mm maximum equipitential earth size is 50mm and s/2 for your main earth bonding there only need 95 120 is over sized

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