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  1. 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...
  2. J

    Length of cable

    Does the length of cable de rate the cable as it creates a greater resistance and as a result heats up the cable reducing its current carrying capacities?
  3. D

    Length of tails

    Afternoon all, New to the site so thanks in advance. Currently working on a new build, the supply was installed last week (new build) 80a fuse installed, EON installed the meter this week with 100a DP switch. All fitted within the external meter box. I’m looking to run tails, ideally I need to...
  4. B

    Cable length calculation

    Hi people, I'm carrying out an online course to gain my qld electrical licence. Been a good while since calculating cable length using equations and regs books. Can anyone guide me to the correct equations please Thanks in advance
  5. S

    Doorbells again - volt drop / max bell wire length

    Hi Folks I've been trying to work out whether a doorbell will work with approximately 16m run of bell wire. I've tried to find out volt drop, resistance (to calculate volt drop), or even CSA of typical bell wire. But no luck. I tested an approx. 3m length with my MFT and got 0.87 Ohms. That...
  6. C

    How to increase cable length?

    Hi guys, Im very new to this forum so thanks for hearing me out. I have an led light that is waterproof. The issue im having is that the cable is not long enough for its purpose. I needed some help or advice as to how i could find a cable attachment to increase its length.. i have attached pics...
  7. G

    Length of tails between meter and consumer unit

    Hi, I am currently studying for my 18th edition regs update exam and came across a video by SparkyNinja on you tube. I think SparkyNinja is very good and produces high quality content. However I disagree with his interpretation of regulation 434.2.1 (i) In his video he says you need a fused...
  8. Zdb

    Expected circuit length (R1+R2)

    Came across this table from on old thread: Is there a table of expected R1+R2 results in BS7671? - https://www.electriciansforums.net/threads/is-there-a-table-of-expected-r1-r2-results-in-bs7671.103412/ I'm just wondering if anyone has the original or a more detailed version that they...
  9. F

    Siren sounder wire length

    This is something I have never come across before even though I have installed a good few alarm systems in my time as a DIYer. I know it is a cheapo alarm but it shouldn't be any different. It came with a little siren and about two feet of flex, black and red two core. I intended to put in to...
  10. T

    Insulation resistance test on length of SWA cable

    Doing new supplies for a school new Shneider 3 phase & N MCCB panel board. 50mm 4 core SWA one end made off in the board earth fly lead from banjo to earth terminal. The other end gland made off in gland (fly lead not made off yet) 3 phases and neutral just hanging there. Done installation...
  11. Y

    Ring circuit cable length

    Hi all I have a ring circuit with 13 sockets. 2.5 mm 3 core cable. My floor area is 60 sqm My question is what is the maximum wire length for a single ring circuit? I used 92 meters of wire for the whole ring circuit. Also I only had a c type rcbo available at my local electrician. Will this...
  12. D

    On off car battery switch - cable length?

    Hi, My car is Mitsubishi Colt 1.3 (1998), and I'd like to install a battery on / off switch in the interior of the car. My question is: would it be ok to use around 1.5 meter length of normal battery cable? The idea is to connect it to the battery negative terminal and to the existing...
  13. 8

    Max length of meter tails

    Ive been asked to look at the electrical installation at a large 5 bed property with an attached annexe that the owners are converting into a 2 bed holiday let. There's one supply cable that comes into the annexe for the entire property . This is currently routed via a single meter to a CU . 2...
  14. P

    The length of a female minute

    Do women have a different size of minute? I ask because if my wife says "I'll only be a minute" I know she will be at least half an hour. When I get commanded to carry out a job, and I know it will take a couple of hours, her estimate is "It'll only take a few minutes". Can any one explain?
  15. Lee Gold

    Working out resistivity R=pL/A

    Examples Please
  16. Andy C

    Crimping to extend cable length.

    Hi all and thanks for the help so far. Re crimping, I have read posts regarding this before. I have just seen those heat shrink solder connections. I was going to use normal red and blue crimps then heat shrink each individual core then heat shrink over the whole T&E. What are peoples...
  17. R

    Expected R1+R2 for a spur

    hi all, quite a common situation i imagine. and the question out of curiosity, more than anything else..... if you have a ring-final, the expected resistance at any socket outlet on the ring should be approx (r1+r2)/4...yes? assume you're planning to run a spur off an outlet, how would you...
  18. uksparks

    Minor Predicament over RFC Length

    Hi, I have just started a new build today, its a large U shaped bungalow with vaulted ceilings etc. I have split the property down into a lot of circuits to help with things due to cable runs etc. I have just wired a section of it today, I was going to do it all in 4mm radials, but by the...
  19. N

    Meter Tails

    Hi, On site dispute needs sorting. We have a consumer unit 3m away as in distance (not cable length) from DNO (outside meter box, flush with wall). We currently have a 25mm 3 core SWA from DNO to consumer unit. Running within the fabric of building and it's protected from the nails and the like...
  20. T

    max length of a 1.0mm flex

    Testing a school which has had lots of LED upgrades with exor controls. 12 way unit above the suspend ceiling with flex's down to the switches. All the leads were 12/14 meters long with the most of it thrown across the ceilings like spiders wed. I use to have a table of max loads and sizes but...

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