conductor | Page 4

conductor

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  1. HappyHippyDad

    Finding a broken line conductor in a ring?

    Hello all. I haven't been posting for a while but I have been 'lurking' as Rpa put it :). Life gets in the way of things! I rarely come across a broken ring, but I now have a broken line conductor on a ring (or rather a poor connection somewhere) R1=1000ohms, R2=0.61ohms, can't member On but...
  2. leep82

    Upgrading earthing conductor

    I am in the process of pricing a DB change for a customer and am a little unsure as to what to do with the earthing conductor. The system is TT and the earthing conductor looks to be 6mm, tails are 16mm with a Ze of 47.7ohms. The main protective bonding conductors have already been upgraded to...
  3. P

    Cables with thermosetting insulation (XLPE cables)

    I understand that XLPE cables operate at a maximum temperature of 90c compared with 70c for PVC insulation. What I don't understand is why the increased temperature permits a reduction in conductor size if XLPE insulated cables are used in preference to cables having PVC insulation. If the...
  4. cliffed

    Main bonding Conductor

    Just your thoughts on this one,recently did a bit of work at a factory unit,there are several units being used by a company. The electrics are really pretty bad,my concern is main bonding of structural metal work,can't really see any Earth conductors to these. In the one area there are steels...
  5. L

    Connecting main protective bonding conductor into MET thoughts

    Any thoughts about connecting main protective bonding conductors into the MET instead of distribution boards? Watched a spark do it the other day and never really thought about it myself. Achieves the same result so it shouldn't be an issue.
  6. M

    Electrical installation design guide

    Have been sizeing up the size of armour on diffent SWA cables to make sure they are suitable to be protective conductors. Come across table 8.8 page 100 .on this table it says maximum bs88 fuse size (for example) 120mm 4core is 500a, when it also says current carrying capacity is 335 method c...
  7. N

    EICR recommendations

    Just a quick one. Testing a house that's install is about 20 year old. Obviously hasn't got a metal clad DB, earthing is only 10mm. Would you put these down in the reccomendations? Even though these items were perfectly fine when it was installed? Lee
  8. K

    new user apprentice - batten holder/line conductor termination??

    Hi all, this is my first post on here. I have searched the web but cant find a straight forwards answer (or an answer at all) for this question which is part of my c&g course. - how is pvc insulation protected against high temperature in batten holder type fittings? and also - why do the...
  9. L

    Does it need it?

    hi everyone, I have got a job to do in a local hairdresser to change a consumer unit fed off an economy 7 meter. My question is do you need to test and notify the works like you would in a domestic dwelling? Also is it mandatory that the incoming services of water/gas are bonded with 10mm...
  10. Rocboni

    Earthing and bonding

    Copied this from trainee section to see if I can get an answer, it is talked about a lot on the forum but reading through the old posts I can't determine whether I'm right or wrong. What I'm looking to understand is sub main earthing conductors. Is what I am saying right? So a sub main to an...
  11. Rocboni

    GN8

    Anyone know where I can get a free copy of IET GN8?
  12. M

    Adiabatic equation on distribution circuits

    Now I know this has probably been covered a few times but I'm struggling to come to terms with my own calculations. I would appreciate it if someone could tell me if my calculations are correct. So basically I've done a periodic and some of the CPC sizes for sub mains are less than half the...
  13. haptism

    Earth marshalling point

    Hi all, have a question about an earth marshaling point. Just looked at a building where there is no bonding present at the incoming water stop cock (although a bond has been made somewhere, from a sub CU). If i put a clamp on the incoming water is it acceptable to run a cable to earth bar of a...
  14. M

    25mm armoured to 16mm earth conductor

    i have to send a 75meter run of a 3 core 25mm armoured from the meter to the fuse board. now due to the lenth i have to have a switched fuse and possibly a isolator on the otherside. due to the earth being 25mm i know alot of isolators only take 16mm. is the use of a helely block perfered to...
  15. G

    Replacing socket back box

    Hi all I have many single sockets in my new place which I would like to upgrade to doubles if possible, however having removed a couple of the face plates I have noticed that I am unable to remove the back boxes as they are 'cable tied' by a red cable looping from the back to the top. I have...
  16. gazdkw82

    CSA main earthing conductor calc

    I'm trying to understand the different ways I can calculate or find the correct size of main earting conductor of an installation. Iv found a formula but it's quite long winded. Is there an quicker process? Here is what I have at the moment after doing some research and practice
  17. P

    Bonding non-protective conductor conduit

    Recently qualified and started working for a company that don't put a fly lead from socket outlets to back boxes and ceiling roses to conduit boxes etc. The engineer says you don't need them because the circuit has its own CPC and the conduit isn't being used as an earth. My understanding was...
  18. juice

    do you use the multipliers from tab 13 in OSG when calulating volt drop?

    I've recently done a C&G 2396 Electrical Design Course and unfortunately the tutor who taught the course did so for the first time and in my opinion didn't do a good job of teaching the material. I'm now doing my revision for an exam this Thursday and trying to make sure all the formula I use...
  19. rustynails

    EICR coding

    I would like you guys to give me some input on what to code this picture as, I was thinking C3. Also, I'm not sure whether the main earthing conductor and main protective bonding is 6mm or 10mm. They were both the same. Forgot the caliper today... I'm erring on the side that it might be 6mm...
  20. D

    Terminating 50mm solid conductor

    I have a job coming up the week after next where I have to terminate a 50mm solid core incomer into a Schneider standard 125A single phase main switch in an acti 9 board. The plan I have come up with is to get the little adaptors Schneider make to allow a lugged connection to be made to the...

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