electrical wiring

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  1. B

    1.5mm CPC on 6mm Cable

    Come across an old Installation with 1.5mm CPC on a 6mm Live conductors whilst doing an EICR. Not seen many of these, in everyones opinion perfectly acceptable if all R1 and R2, IR, Measured ZS test check out ok?
  2. Pretty Mouth

    Max circuit length for LEDs powered by constant current driver.

    Hi all. Constant current LED lighting is a new concept to me. Not that difficult to get the head around, but I cannot find an answer to the following question: How do I determine the maximum length of a ELV LED lighting circuit powered by a constant current driver? For a constant voltage ELV...
  3. Lister1987

    MICC - identification based on colour

    Just doing a mock exam i've got from college and one of the questions is regarding the colour sheathing on MICC cables; I know that red is ubiquitious with fire alarm systems but don't know about the other colours, as luck would have it GSH has done a few videos recently on MICC and mentions...
  4. Pretty Mouth

    Regulations 433.2.2 and 433.3.1

    433.2.2 The device protecting a conductor against overload may be installed along the run of that conductor if the part of the run between the point where a change occurs (in cross-sectional area, method of installation, type of cable or conductor, or in environmental conditions) and the...
  5. R

    Curious journey for a HDMI cable...

    Hi there and thanks for clicking. I have a curious conundrum regarding a long and winding journey for a five-metre fire-rated HDMI cable. I hope your collective expertise can resolve this matter. The key question for me is not whether it's possible, but whether it is within housing regulations...
  6. 8

    House has a lean to with a metal clad box and plastic double switched socket adjacent to a waste water drain.

    A lean to with a metal clad box and a plastic double switched socket fitted to it adjacent to a water drain for a washing machine. Obviously I am not happy with it so thought I would fit a BG weatherproof IP66 as a direct replacement; thinking I had to remove the flex I pulled some 2.5mm T&E...
  7. S

    The Dreaded Hot Tub.what is needed?

    Hi all, Asked to price up installing a hot tub supply, just wanted some guidance. Customer not sure on tube yet so doing a couple. 13A Hot tub usually are just plug and play ... BUT.. the tub is going roughly 15 meters away from house, i have no problem with fitting a socket to supply the tub...
  8. K

    Loft lighting

    found a double socket in my loft which I want to use for lighting up there. can I use 1.5mm twin and earth connected between the socket and a 3amp fuse switch to power the lights?? TIA x
  9. P

    Maximum spacing supports for metal trunking HELP

    Evening people, Was hoping someone could help me with this problem I'm having. I am writing up my portfolio NVQ and writing about installing metal trunking. On the OSG page 143 table D4, column number 1 list the trunking sizes by cross sectional area. The trunking I have used was 100mm x...
  10. wheeto

    Sockets in bathrooms

    A friend of mine has installed a BS-1363 socket in their bathroom, well outside of the zones (but not 3m outside) and protected by a type A RCBO which is itself downstream of a type AC RCD. The friend installed the socket in a 40mm back box, and when (s)he moves house and gets an EICR, the...
  11. H

    How can this be completed correctly.

    Hello there. I recently had a pool with a screen enclosure installed at my home. I would.like to add a spot light to the outside of the enclosure overlooking my back yard. There is an outside spotlight that is still in use near the outside corner of my home that was used prior but is now in the...
  12. Lister1987

    Pimp my Regs / OSG / Other

    Those that have sat them before will no doubt have done it, tutors and the like will no doubt recommend they do and serving sparks will no doubt to it. Highlighting, marking and improving the usability of your regs (and/or other publications - OSG for example will make taking an exam (or just...
  13. J

    Circuit Design...

    Hi there, Just hoping something can clear another small item up for me at all. When designing a circuit and looking at cable length for a Ring Final, would you consider the length used in the R1+R2 formula to be the length of the full ring or just half the ring? For example, if I have a ring...
  14. R

    Electrical wiring

    Hi I wonder if anyone can help, I need to install a socket outside for my lazy spa, I have a plug socket which is a spur off the ring, i want to remove the socket and replace with a fused spur, from the fused spur I intend to fit a twin socket followed by another twin socket outside. The second...
  15. Mark Wright

    Maximum Branches from Socket on Radial that's acceptable.

    What would be the maximum amount of Branches from a Socket on a Radial that you would find acceptable? I've seen 4 I'm not talking about Design or being Tidy or keeping it nice for testing but how many would you say No that's just too many?
  16. J

    Time / current characteristic curves...

    Just trying to clear something up for myself, hoping someone can put it into layman terms for me. I'm looking at the time / characteristic curves in 7671. For example, 60890 Type B curve, p. 370. Taking the example of a 32a breaker, the line flattens off vertically at 160amps. All understood...
  17. F

    Adding extra sockets

    I'm not a qualified electrician, just diy. I need to add 4 double sockets above the workbench in my study. The total load isn't going to exceed 13amps. I considered just using a 5m 8 gang extension lead from the existing socket on the other side of the room and pinning the cable to the skirting...
  18. newfutile

    Maximum ZS values GN3

    On page 142 of the latest Guidance Note 3 it list a 16 amp type B max ZS as 2.15, however i think 2.2 is the real value, it also states that at 16 amp type C is 1.1 ohms which is correct, but a type B should be double the value of a type C. anyone else have a view on this?
  19. J

    Calculating Fault Current...

    Hi all, quick question, hoping an easy one to answer. Just need to clarify this up in my own head. When calculating fault current from Zs, do I take Cmin into account? For example. Zs is 0.54 ohms So to find fault current I would calculate nominal voltage / Zs So 230 / 0.54 But, should I...
  20. Les Macaulay

    Inspection of wiring to new industrial dish washer

    Inspected a final circuit for a new dishwasher of the commercial type, rated at 4.3 kW, about 50M from the D/B. Final connection joint to the appliance flex comprises connector block in a dry wall box with lid lying on floor of commercial kitchen. C1, C2 or C3? Isolating switch on opposite...

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