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  1. B

    Maximum length of Schuco rails before sliding joint

    What is the maximum length you can have of Schuco rail before you need a sliding rather than a fixed rail connector? I am sure I have seen it before in one of the manuals but cannot find it now. Thanks Regards Bruce
  2. brucelee

    working length of circuit from resistance for volt drop

    Hi all could someone please be so kind to explain how i work out the length of a existing ring final circuit 2.5/1.5 T/E and in turn Volt Drop i know to work out length its L= R x 1000 divided by m/ohm/m but would i use the r1 measurement eg 0.58ohms rn was 0.58ohms r2 was 0.96 or from the...
  3. R

    Maximum length for BT

    Hello, We have had a log cabin for my better half to run her company from. All wired ect, but she now needs a BT point for a Card machine. As the crow flys it's about 35 - 40 meters from the master, which is the only point in the property. Is there a maximum distance specified by BT after...
    • Richard
    • Thread
    • aus length maximum
    • Replies: 9
    • Forum: Australia
  4. S

    Volt Drop

    Hi I have a query one of you may know the answer to. I have installed some lights in the woodlands for a customer and he is using 12watt LED lights he is only installing a few i think it was 186 watts or something. I have used SWA cable 1.5 mm as it is about 200metres and worked out the...
    • switched on
    • Thread
    • aus cable circuit length lights supply volt drop volts
    • Replies: 22
    • Forum: Australia
  5. O

    Calculating cable length from resistance

    I've noticed a number of threads regarding exam questions asking to calculate the length of a cable by measuring resistance. But I can't think of a practical situation where you would ever need to do this and seriously doubt the accuracy of the method. I know there are specialist cable fault...
  6. Mark.W

    Circuit Length

    Hi Peeps I have my 2391 coming up in October and I am busy revising. When determing the circuit length and VD, my notes say to link L - N at the load side and take the loop resistance at the DB. The example I have is : Loop Resistance = 0.7 ohms (R) and csa of cable = 1mm2 (S), calculate the...
  7. I

    BS 3871 Type 2 30 A MCB (allowed installation method)

    hi guys after a little advice re a 30 A Type 2 BS 3871 MCB. Now i know they are old but still compliant , just checked the OSG p 49 Table 7.1 for maximum length and installation methods but there not listed. i have the maximum ZS of 0.88 from page 103 table 2d OSG where they are listed. can...
    • ianphilip007
    • Thread
    • aus circuit design installation length listed mcb method methods type
    • Replies: 19
    • Forum: Australia
  8. S

    Determining cable length

    Hi, Im working on site in worthing and have been asked to find out the length of an installed cable. Cable size 150mm 4 core r1+r1=0.3 Ze=0.06 Any help on how to calculate the length of cable would be much appreciated.
  9. J

    Supply tails length?????

    hi there guy's i have to move a consumer unit from the understair's cupboard,to the larder cupboard,which back's onto the wall,where the original consumer unit sit's,the problem i have is i can't remember the maximum length the 25mm tail's you are allowed to have, without installing a separate...
  10. M

    parallel swa submain

    Hi I am considering the possibility of using 2 unused and existing 95mm 4core aluminium cables in parallel to feed a new submain distribution board I wondered if any one else has done similar and may be able to reassure me on the practical and/or technical implications the length of run is 130m...
    • mbelec
    • Thread
    • cables canada distribution length parallel submain swa
    • Replies: 2
    • Forum: Canada
  11. S

    Bending 90 in 20mm or25mm conduit

    Please can some one help me please haven't done steel conduit for a while. What's the best way to get a 90 bend at the right length 1st time???
  12. D

    Schuco rail length calc

    Chaps, I notice the Schuco Rail length calculation is "22 mm + [number of modules x (module width + 21 mm)]". I'm guessing this leaves zero gap at the end of the rail after the end-clamps. Are Schuco expecting their end-clamps to be flush with the end of the rail then?
  13. S

    Cable length

    How far can i take swa cable off a spured socket via a fcu, and what do i need to take into account. any help would be great.
  14. 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...
    • steve.t.
    • Thread
    • aus cable length swa
    • Replies: 0
    • Forum: Australia
  15. 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.
  16. R

    Fluke 6500 paramenter change for extension leads

    How do I change the set-up parameter for extensions leads so they are in limits?
  17. 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...
    • i=p/u
    • Thread
    • aus cable length
    • Replies: 85
    • Forum: Australia
  18. 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...
    • Penance
    • Thread
    • acceptable aus fcu length spur
    • Replies: 8
    • Forum: Australia
  19. 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:
  20. 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...

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