protective | Page 3

protective

Recent contents View information Top users
  1. juice

    is it up to the customer what protective device is in his installation?

    I've been asked to install a shower unit in a clients house and he only wants me to change the shower itself. The consumer unit has BS3036 rewireable fuses and no RCD protecting any of the circuits, including the existing shower circuit. He has already bought the new shower and only wants me to...
  2. 0

    3 phase cable selection and protective devices

    Hi everyone. I'm after abit of help calculating cables sizes and protective devices for a 3 phase DOL motor. I haven't worked on 3 phase equipment for many years and 3 phase calculations is as far back as college so please excuse my ignorance on the subject and not knowing answers to perhaps...
  3. G

    Earthing inside a submain panel from main swa incomer

    OK, going to keep this short. Supply is 150mm 4 core SWA, with NO supplymentary earth ( calcs done by others, ) QUESTION IS. Do you NEED to run an earth ( is it a regulation) from banjo on inside to earthing terminal inside board. Common sense and a simple ohms continuity test (0.01 ohms)...
  4. S

    What size 3 phase cable and protective device.

    Bit nervous about putting this on the open board, normally stick to the trainee section. Hope i can get some help. I have recently qualified so dont be to harsh if im not 100% correct. Ive been asked to help an older spark to pull a a 3 phase SWA cable. Ive been asked to design the circuit...
  5. D

    Minor Works Cerificate question

    Hi Folks, I am filling out a minor works certificate for 2 fused spurs I have fitted from 2 socket in the livin room to supply 2 wall lights 5A fuse fitted in spur. My question is on the minor works cert where it says Method of fault protection, do I put Automatic disconnection of supply...
  6. 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...
  7. R

    SWA armouring as cpc and Protective Bonding.

    Was asked today why we can use the armouring of an SWA as an Earthing conductor but not as a main protective bonding conductor unless we apply the resistivity formula for steel which result is8x that of copper. Can anybody explain this in simple terms because the person i am trying to explain...
  8. cprfenom

    socket on 6.0mm T&E

    A circuit wired in 6.0/2.5 with a 32amp MCB feeding a double socket for a gas hob and gas oven. Now I know that the protective device is for the cable, but I am concerned that the socket can only take 13+7. Should I down rate the protective device for the socket and not the cable in this...
  9. CK Tools

    Protective Mat

    Hi all Just wondering if you regularly use protective mat for worktops, wood floors etc and if so, what is it made of Cheers Charles
  10. HappyHippyDad

    Is there a protective cover for the 'BACK' of a dry lining box?

    Hello all.. I have been asked by a customer to fit a recessed socket in the kitchen. The socket will be located on the side of a cupboard (no other viable options). I have given them options of nice looking wooden surface boxes but they are adamant they want it recessed. I want to cover the...
  11. Marvo

    Protective Devices

    There's hundreds and hundreds of different protective devices around that you're likely to come across sooner or later. They all operate slightly differently and they may appear different in shape and size but they've all got one thing in common in that they will facilitate the disconnection of...
  12. C

    outdoor lighting cable selection protective device

    Hi i wanted to clarify what 7671 says about wiring of outdoor lights. presume the job is a lamp post 0.5M away from the house. Fed from a fused spur unit, with a downrated fuse, inside the house from the upstairs S/O ringmain. The cable would be 1.5mm2 twin earth from the fused unit wall...
  13. D

    Main Protective Bonding Conductor

    Hi, testing a UNI with one main supply, which in turn feeds around 10 separate building. Each building as it own Gas supply with meter, so therefore a Protective Bonding Conductor to each incoming supply. Does the size of the cable have to correspond to the incoming supply size, or to the size...
  14. S

    Funny readings continuity of protective conductors

    I'm doing an continuity test on a lighting circuit and I'm getting funny readings I'm putting on test lead on earth and one on switch live then I'm getting a reading of around 1.4 ohms but then when I'm checking the polarity it's shooting up to around 93 ohms but not breaking the circuit as you...
  15. S

    Is it still a Main Protective Bonding Conductor?

    B. Gas decided to a. relocate a customers meter and b. connect it to the gas main in plastic. The old meter was removed leaving a stub of pipe with the MPBC still connected. My view is that this is now an earth rod, auxiliary to the distributor earthing conductor.. Another guy looked at it and...
  16. J

    Main Protective Bonding Conductors

    Hi all. Could someone with better understanding help clear this up for me please; In the Regs (544) there appears to be no value of resistance for the above and also states that if copper, need not exceed csa of 25mm2. In GN3 it talks about using a value of 0.05 ohms for verification of bonding...
  17. M

    Mains on 3-phase DB

    Hi I am working in a hotel and I found that a 3-phase DB was fed by 2 seperate swa cables one containing the 3 phases and the other a seperate neutral and earth I know this is bad practice but can someone tell me why the NIC firm have picked this ad a fault I would not have done this myself it...
  18. N

    Main Protective Bonding - Gas and Water

    Hi all, I have been asked to bond the gas and water of my neighbours house as British Gas have picked it up as not bonded. The consumer unit is an old Wylex one with re-wireable fuses. Ideally needs replacing with MCBs and RCD protection but they are not willing to do that until next year...
  19. M

    protective device and why for following

    Circuit supplying a conventional machine Supply to a welding device
  20. P

    Protective device

    Hi all need some help, I was called to a job to do some rectification work after a so called sparkey half wired a house. He decided to run a 10mm T+E from a Henley block located in a cellar to a second C/U three floors up, I'm going to have to change the 10mm to 16mm. My question is what do I...

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