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  1. 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...
    • mickfred
    • Thread
    • armour cable conductor design electrical electrical installation guide installation motor motors
    • Replies: 27
    • Forum: The Welcome Forum
  2. 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
  3. 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...
  4. 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...
    • Liam howe
    • Thread
    • bonding conductor conductors domestic protective
    • Replies: 23
    • Forum: UK Electrical Forum
  5. 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...
  6. 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...
    • moosey86
    • Thread
    • adiabatic cable circuits conductor distribution equation fault minimum
    • Replies: 9
    • Forum: UK Electrical Forum
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
    • juice
    • Thread
    • cable conductor current table temperature volt drop volts
    • Replies: 9
    • Forum: UK Electrical Forum
  12. 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...
  13. davesparks

    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...
  14. gazdkw82

    Main earthing conductor

    I took a glance at my CU the other day and noticed the main earthing conductor was terminated into a terminal block and then terminated to the supply earth. This seemed odd to me and also it didn't look very good. Why not terminate it straight to the supply earth? Should I contact my supplier?
  15. Z

    Question regarding old steel TN Earthing conductor from supply sheath

    I'm a little confused as to where the responsibility lies for the conductor described in the title. You know the type - on old TN supplies where you've got a bare multistrand conductor coming from the sheath to the M.E.T that's always of a fairly piddly CSA. My understanding is that this is the...
  16. N

    Main Bonding Conductor routing method

    Further to my recent post regarding main bonding. When bonding the incoming water at the other side of the property, what is acceptable when running the cable down a wall due to be plastered? Due to concrete floor and a terraced house, the only way is to run the cable up underneath...
    • Noob2013
    • Thread
    • bonding conductor main method
    • Replies: 8
    • Forum: UK Electrical Forum
  17. A

    Using pipe work to bond to incoming water

    I have recently come across a situation whereby instead of running a main equipotential bonding conductor from the MET to the incoming water someone had instead ran a short bond from the MET to some copper pipe in the mains cupboard and clamped it and then placed a bond on the pipe near the...
    • atm84
    • Thread
    • bonding conductor electrical work incoming resistance using water
    • Replies: 23
    • Forum: UK Electrical Forum
  18. A

    BS 7671 Table 41.3, conductor temperature?

    Edited: sorry of course Ze should be added to the post below, Table 41.3 is for comparing Zs. Hi, it is my understanding that Table 41.3 of BS 7671 should be used for comparing the tabulated values with the resistances of: 1) the line conductor at 70 degC; 2) cpc at initial temperature, as...
  19. drzsta

    Using extraneous metal as bonding conductor

    Hi, Scenario, Oil service to a church boiler is at the furthest point to the distribution board. Rather than run a separate bonding conductor to the oil service I've decided to bond the 3" cast iron heating pipework local to the DB then take a fly lead at the boiler from the CH pipework to...
  20. W

    Hrc fuses

    The question is : Is there a difference in the protection characteristcs of a semi-conductor and a high speed hrc fuse can any one help

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