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  1. T

    Working out the length of a ring finals circuit

    r1: 1.15 r2: 1.80 rn: 1.15 r1r2 0.69 To work out the length of a ring in 2.5mm twin would this be correct 0.69/(19.51/1000) = 35m or would you use the r1r2 before you divide it by 4?
  2. S

    Insulation test L to E long length of SWA

    Insulation test live to earth = 0.7 ohms. This is a long length of buried swa cable (approx 100m) from mains in to submain. Test done with live and earth disconected at main and with switch off at sub main. Question - is this an accurate reading or am I misding something. Its a big job to...
  3. gobananas

    spur cable length

    Im running a ring main for all my sockets using 2.5 cable....as an after thought i was thinking to spur off one of my socket outlets and run up the wall and along a wooden beam...probably no longer that about 4 meters? for a ceiling fan.....this isnt the aircon mentioned in another...
  4. E

    Design help level 3. Finding length

    Hi guys, I'm struggling with working out the length to fill In the gaps for my upcoming exam. I'm struggling with finding the length as I don't have or know the correct formula to use. The yellow highlighted areas will be blank in my actual exam. For example circuit 2 cable length is 12m and...
  5. L

    Wall socket cable length?

    Hey there, I'll be building an electrical socket on the other side of the room. While passing a wire through the wall I wonder, does length affect socket safety? Would a long cable going through a 2m long wall need to be protected in anyway to make it safer? The wall is finished so I'll need...
  6. S

    LED Strips wiring - various strips length to 2 drivers?

    Hi all, I got my place recently renovated with a cove light installed in my living room. The issue is that my contractor engaged with an electrician who didn't seem to know too much and got a bad result, so I'm looking at re-wiring by myself. The cove is roughly 3 x 3.7m. I have 2 x 80W 12V...
  7. P

    Length of a 20 amp circuit run

    Hi there. I am a DIYer and am located in Ontario, Canada. I would like to put in a dedicated 20 amp circuit into my attached garage for my 15 amp table saw. The circuit will only have one tool on it at a time (the lights and existing outlets are on their own 15 amp circuits and will be left in...
  8. R

    Max length of cable runs.

    Hi I'm looking at Table 7.1(i) in the On Site Guide. Max length of cable runs. In some cases where there is no RCD protection the length is given as a number with a zs suffix. eg 47zs The zs suffix means "limitted by Zs" the final circuit line-earth loop impedence. In these cases is the...
  9. M

    Circuit length and voltage drop

    Hi, I'm currently doing my assignment for 2357 and was just making sure I'm calculating the cable length for the lighting circuits right. As depending which way you do it, it alters the voltage drop a bit. On the drawings I've looped in and out at the switches all the way to the final light...
  10. M

    C&G Level 3 Project Question (Cafe ring final sockets length)

    Hi guys I'm a bit frazzled by the wording on the main project. So, we are told to keep the max circuit length down to 30m, tutors said that isnt physically possible so just try to keep it under 40m and they noted that the socket circuit was a bit of a mental one and that the 30m guidance set...
  11. F

    Connecting Masthead Amp, Cable Length

    Hey gents. I'm looking to install a masthead amp to the old folk's TV aerial outside their garden cabin. The current setup is a 10 foot long coaxial cable running from the aerial directly to the tv in the cabin. I want to of course install the amp between the aerial and the Power-supply/TV -...
  12. E

    MCB operation & cable length

    I'm currently just at the start of my electrical training so please excuse what may be a dumb question. It's a few weeks till I'm back at college and so not able to ask the question there. I want to understand a bit more about cable length. If you're using an MCB as overcurrent and fault...
  13. V

    Length of run

    I need to run 200' of electrical to and outdoor outlet. My question is; I am only running this outlet to power an AC transformer to power an outdoor access point for WIFI. The POE power injector is 15.4W (Max. 48VDC). What gauge wire should i use for this one outlet?
  14. B

    Surge protection cable length

    Hi all question regarding the length of surge protector cables. I have read the reg 534.4.8 that states that the length should not exceed 500mm. Is that for each conductor so every conductor should be 500mm or less. So with a 3 phase surge protector all 3 phases/neutral and earth should not...
  15. A

    Meter tails >3 metres in length

    Hi Has anybody ever found where this "rule has come from"? In the NAPIT codebreakers book it quotes "ESQCR regs" but it is not actually written in there. If it is a DNO rule then it comes under their regs (ESQCR), but as I said, it is not in there....
  16. M

    Radial Circuit Cable Length

    Hello all, Just had an electrician wire in a radial circuit in my house to my loft as I use the space for my home theatre equipment & wanted a dedicated circuit for the equipment as its consists of quite a few power hungry amps & devices. He has wired the radial in 4.0mm2 twin & earth cable...
  17. S

    Protection of Meter Tails and Length

    Good Afternoon All, I have just completed a Periodic test on a house and have a question about the meter tails. The house is 14 years old so has 25mm meter tails. The CU is in the garage and the meter box is around 7m away on an external wall as you'd expect. Looking at it, I imagine that the...
  18. S

    Went to a job today and noticed a length of metal conduit going across a pathway. The metal conduit is not earthed.

    I just wondered what people’s thoughts were as to weather it should be earthed being an extraneous conductive part? It’s fixed to the concrete floor and if there was a break down in insulation there could be a potential difference. If you do bond it could it be introducing a risk? 1598092922...
  19. dokkan1080

    Zs and circuit length

    if you have the ze and know the length of a circuit can you calculate the zs ? Ze : 0.24 Circuit length : 100m 1.5mm cable twin
  20. S

    Is this OK? 100m run of SWA

    Hi, So i’ve recently put a 100m length of SWA 2-core 2.5 to the other end of a field with a 16a commando socket at the bottom. It’s for a shepard hut to go down the bottom to be plugged in and out. The breaker it goes to inside the house where I’ve wired it in is a B16, onto the RCD that is...

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