length | Page 8

length

Recent contents View information Top users
  1. 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...
  2. N

    Voltage Drop

    We are all familiar with the requirements for measuring Zs and verifying that it is within the limits for the particular type of protective device. I use a single guide of 1.2 ohms as the maximum though there are of course many variations. What we (I) have not been noting is (R1+ Rn) and the...
  3. Golden_Boy

    Voltage Drop

    Why all the complicated formulea for working out voltage drop? Why not just connect the load and measure the voltage with a meter?:confused:
  4. R

    hey guys continuity testing

    hey guys i am studying for my C&G level 3 and i have my practical inspection and testing next week and i cant find anywhere thae values that are aceptable when you read continuity on a lighting circuit for instances and they havent told us at college i presume it is somethning to do with the...
  5. L

    how do I work this out

    A 1.5mm2 conductor has a design current of 4 a and a length of 10 meters. its volt drop is 29 mv/A/m what is the volt drop across the terminals. Can anyone show me how to work this nasty little bugger out Answers are 11.6v 17.4 v 1.16v 1.74 v
  6. S

    fused spur cable length???

    i recently had to add a spur from a ring to supply a item of fixed equipment. I took the supply from a socket into to a switched fused spur and placed the necessary fuse for the equipment directly after the socket then a 10 meter cable run to a flex outlet connection unit then a 0.5m flex cord...
  7. O

    swiched fused isolator

    just doing a re wire and repositioning CU, a friend of mine told me that i would have to fit a fused isolator to the tails, is this correct
  8. S

    length of meter tails

    hello, ive recently tested a house where the main tails ran quite a distance! is there a regulation for max tail length still as it used to be 2m???
  9. C

    Maximum length of Main Bonding

    I did find the answer pretty much to this in an old thread & was answered by Chris... But wonder if I could get a few more suggestions as to being correct. Installed a Main Water Bond from a DB Board to the Main Incoming water supply which was (in my opinion) well over 25m away. We ran it along...
  10. E

    Whats maximum allowable length of tails from meter to CU

    Hi all , Is there a maximum length for domestic meter tails ? I have a friend who wants to move his consumer unit to a different position without the expense of paying for the meter to be moved. Just wondered if the c.s.a. of the meter tails is spec'd correctley and protected is there a...
  11. J

    Maximum Cable Length

    Ok. I've been trying to get my head round this all day but I'm getting nowhere. On page 45 of the OSG (Table 7.1) it says the maximum length of a lighting circuit wired in 1.5/1.0 cable on a 6 amp Type B MCB is 90 meters. However, working out the voltage drop for this length of cable I'm...
  12. M

    length off flex you can ad to an appliance

    hi what length off flex can you add to an appliance ie washing machine,tumbel dryre, i cant find any thing in the reg just had a quick look . i was on a job to day and some one had 2 m added on to a washing machine so the flex was about 3 m long personaly i would have fitted a socket...
  13. sparks1234

    Maximum circuit length

    Looked in the onsite guide today as we thought we may be close to the limit of a ringmain circuit length, the guide gives out a maximum length of just over a hundred mtrs for a 2-5 / 2-5 / 1-5 ring main. Now as we are looking at a trunking system which is to be wired in singles but all at 2-5mm...
  14. D

    Consumer unit tails - maximum length

    Hi Can anyone confirm what the maximum length is for consumer unit tails? I wasn't aware that there was any set maximum - but I have heard elsewhere that there is a maximum of 3 metres ??? Is this the case, and can anyone tell me where to read up on it. Is it actually in the regs...
  15. A

    Length and Routing of Meter Tails

    Scenario: A mains head is in one end of a house, split phase. Second phase allowed on the basis of a second semi-separate dwelling to be built adjoining the existing house approximately 30 metres away frm the head. Would it be permissiible to run the meter tails from the exisiting mains head...
  16. P

    board change and cable length?

    Got to do a board change 7 ways currently, but existing cables have been left short as earths on new unit on right hand side instead of left! what is the best/ legitimate way of extending them? main earth & bonding will also need extending!
  17. I

    Meter Tails Length

    Recently, I've spotted this in a customers garage... The main consumer unit in one corner of the garage and a garage consumer unit in the other. The tails have been split with a henley block beneath the main CU and 25mm tails run up into the garage loft space, run over the beams unclipped, and...
  18. K

    Cable length

    Can anybody please simplify some calculations for me please i have a 100A PME supply that is supplying a house roughly 100-150 metres away. it is run in 50mm 4 core SWA three phase and neutral they have run a ten mm cpc seperate alongside it, No continuity from the armourings as they have...
  19. S

    Old problem with circuit length calcs

    Sorry to bring up an old post but im confused. I have carried out tests on a kitchen ring final wired in 2.5mm/1.5mm T&E, results as follows: r1=0.36 rn=0.34 r2=0.59 I then joined leg 1 of line conductor to leg 2 of cpc and leg 2 of line conductor to leg 1 of cpc and measured the R1+R2 at...
  20. C

    Length of meter tails

    Just phoned Yedl today about meter tails length [like trying to get blood out of a stone] they would not give me a figure. I know as a rule of thumb it is 3m but just doing a install where the closest I can locate the CU so it is accesible is 2.4m away.Once I have run the cable under the flloor...

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top