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  1. S

    SWA cable length

    Hi Taking a spur off a socket into a 13A FCU then out to a garden socket about 20m away. Do the rules of cable length still apply as i'm using a fcu or do i have to measure the downstairs ring and make sure it doesn.t exeed 106m in 2.5 for the whole ring. Or shall i just check the voltage drop...
  2. L

    Reinforced 6 core burglar alarm cable

    Hi guys, Does anyone know where I might be able to get hold of some reinforced burglar alarm cable? It's to be run from the main house control panel to a shed in the garden.
  3. R

    Fluke 6500 paramenter change for extension leads

    How do I change the set-up parameter for extensions leads so they are in limits?
  4. i=p/u

    length of cable runs

    is this correct for lighting circuit of 1.5mm line and 1mm cpc ze+R1+R2=zs b6 mcb ze R1+R2 6.18ohms - 0.8ohms =5.38ohms cable per meter = 0.03020ohms so 5.38ohms/0.03020=178.1M does this mean my lighting circuit can be this length 178M and still be within zs...
  5. P

    Acceptable spur length from fcu

    Putting a final ring in kitchen and will have a fcu on the ring for the cooker hood. I want to then run from fcu up wall to a flex plate. Due a window above the fcu I can't run straight up and it also wouldn't be where the outlet needs to be. I can run down from the fcu, under the floor...
  6. D

    length of ring main circuit

    what is the max length these circuits can go to in 2.5mm t & e ? 32a mcb with an installation method of clipped direct, just curious :confused:
  7. G

    Extension lead length

    I've seen many cheap(£1.49) 4 way 0.5 metre extensions on sale in Asda and Morrisons. I seem to remember from somewhere that an extension lead has to be at least 1 metre long. Occasionaly, the short cable allows easy placement for audio etc. but I thought it wasn't allowed. Does anyone else...
  8. D

    length of ring main

    Hi all what is the maximun length of a ring main in 2.5 te can you install as doing an extension in a bungaloe and the board is the other side of the building we going to be protecting the circuit with a 20amp mcb no larage loads as it feeds bedroom and lounges there will be no insulation on the...
  9. S

    Volt drop theories

    I've yet to come across this problem but like every good scout I like to be prepared. If a circuit is over the maximum volt drop permitted but fixed in the length of the circuit, how would you over come this? Would it be a simple case of using cable with bigger csa? Does anyone else know of...
  10. X

    Help. Any way to measure the length of a self regulating trace heating cable?

    Here's the problem. We have a self regulating trace heating tape installed on a piping process line where we need to know the length of the tape. The tape was estimated to be 10 metres (approx 32.8 feet). However the guys who installed it have reported that they have installed 19 metres...
  11. B

    max length for main cable supplying single phase sub board

    hi all is there a regulation for a single phase board in a domestic property which is going to supply (from mains) a seperate sub board for an additional installation.ie a garage, is there a minimum requirement for size and length of new mains cable supplying the new sub board,also does having a...
  12. mrloy99

    ring circuit length concerns

    I have just recently started a new job-its a nursing home and I have been giving the work of 1st & 2nd fix to the 60 odd ensuite rooms.The job is on 2 floors and there is only one dist board on each floor.I have been instructed by the foreman to wire one ring(and one lighting circuit) to do a...
  13. S

    Getting 10mm T&E in 25mm conduit

    Is it possible and how much would a 3m length of 25mm conduit cost
  14. S

    First installation

    Anybody had any problems using a Schuco fixing brackets with curved clay tiles? Also, does it matter whether you use the pos or neg for the long cable back to the isolator?
  15. W

    Cable length limit from table 7.1

    Evening all Hopeully someone can help me get my head around this. I'm looking at table 7.1 OSG. For the 1361/3036 45A radials on a TN-S system the limiting factor is sc, which means its limited by the line to neutral loop impedance (short circuit). But the TNC-S it isn't. Can't see what the...
  16. T

    Replacing underfloor heating probe

    Has anyone ever had to replace an underfloor heating temperature probe? I know there supposed to last but if one ever did fail I can't see how it can be replaced, it comes with a length of flexible conduit, easy enough to pull the old one out, but would be a nightmare slide a new one in...
  17. T

    Maximum cable length

    Does anyone know the maximum cable length that can be used for a ring circuit using 2.5 t+e with a 32amp breaker?
  18. J

    meter tails maximum length

    Hello, Relating to a house/domestic installation, is there a maximum length for 25mm meter tails? I have got it into my head (old age creeping in!) that it is a metre - need confirmation/advice about this from any kind souls watching. Thank you, from member's first posting.:o
  19. E

    Voltage drop calculation format

    VOLTAGE DROP CALCULATION FORMAT hi my friends, is anybody have voltage drop calculation format? AND THERE BEEN SOME CHANGING OF OPINIONS AND ADVICES AS FOLLOW 1ST REPLY Shabu there's a few ways of calculating volt drop, the vast majority provide you with an "average" assuming the load is...
  20. V

    Maximum Cable Length??

    can someone please help me with this question There is a 40A BS88 fuse, protecting a 10mm cable with a 4mm Earth, it is wired to Reference method C, supply is TNS and it is protected by a 30mA RCD. What is the maximum length the cable can be? (thats all the info i have! I haven't been to...

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