Posting a message to the forum will remove the above advertisement
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Discuss Determining the size of multi-core armoured cable to use in the Electrical Wiring, Theories and Regulations area at ElectrciansForums.co.uk.

Please make sure you checkout our forum sponsors, many do discounts for members and, they keep the forum free to use.
  1. CarlosF
    Offline

    CarlosF New EF Member

    Location:
    Nigeria
    I would like to have insights from fellow Forum members on how to size multi-core ( 4 core PVC/SWA/PVC Armoured Cable) for buildings.

    For a example,what size of armoured cable can withstand 100Amps ( 3 Phase supply) .
    The building is 15m from the nearest electric pole where the armoured cable will take supply from to the building.
     
  2. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Carlos, what experience/qualifications do you hold in the electrical industry? as your profile does not list any.
     
  3. suffolkspark
    Offline

    suffolkspark Electrician's Arms

    Location:
    suffolk
    Its all in the regs book carlos
     
  4. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Like, he is going to get a copy of BS 7671 in Nigeria? Mind you in saying that give the OP your bank details and you could get lucky
     
    • Funny Funny x 3
    • Like Like x 1
  5. CarlosF
    Offline

    CarlosF New EF Member

    Location:
    Nigeria
    I know it is in the reg books,but just want insights from experienced engineers here.
     
    • Optimistic Optimistic x 1
  6. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Of course you do
     
    • Funny Funny x 1
  7. littlespark
    Offline

    littlespark Electrician's Arms

    Location:
    Scottish Borders
    1.5mm will do just fine. Roughly 14m long cut-off should do :rolleyes:

    Does your neighbour know you're tapping off his feed?

    Seriously though, this information is in the regs book and is very easy to find.
     
    • Funny Funny x 1
  8. darkwood
    Offline

    darkwood Super Moderator Staff Member Super Moderator

    Location:
    West Yorkshire
    Welcome to the forum Carlos, several factors have to be weighed up in specifying a cable there is no guessing or ball park figures that can be used.
    I note you are from Nigeria, this is a forum based on UK regulations so please be aware your own regulations may not be the same so advice given may not be correct for your location.

    It seems clear you are not qualified from the nature of your question so our advice would be to contract in a local Electrical Engineer to assist with your queries.

    In answer to your question, many factors need to be considered:-

    -Installation methods.
    -Ambient Temp'.
    -Grouping Factors.
    -Length
    -Volts drop (subject to differing calculations dependent on nature of load).
    -Design load

    to name a few considerations, also environmental factors may factor in to the installation methods which can greatly effect the correction factors needed to calculate the cable size IE if the cable is required to be buried.

    So hopefully just a little insight here as to why it is best to get in a local Electrician to design this and why as a forum we are happy to advice but draw a line at doing all the calculations for you.

    If you can give us insight into your electrical qualifications and then provide your calculations we of course will be happy to confirm them or show you any errors and/or nudges in the right direction if needed.
     
    • Like Like x 2
    • Optimistic Optimistic x 2
    • Friendly Friendly x 1
  9. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Do you actually have a copy of BS 7671 Carlos?
     
    • Optimistic Optimistic x 1
  10. CarlosF
    Offline

    CarlosF New EF Member

    Location:
    Nigeria
    The armoured cable is the mains supply to the building.

    The ambient temperature in my locality is 28 Degree Celcius.

    We have overhead distribution system here,so the supply to the building will be taken from the nearby concrete electric pole.

    The armoured cable will be clipped to the pole and later buried underground before terminating at the 3-phase cut-out porcelain cartridge fuse.

    There will be no Grouping Factor since the armoured cable will be installed alone from the electric pole to the building.

    The length the armoured cable will cover is 15m.

    As I have said earlier , the estimated current of the building is 100Amps .Just need an insight on the sizing of the armoured cable that will withstand the current.

    We do make use of BS 7671 here.

    I studied Electrical Engineering.

    @Pete999,You sound so arrogant.
     
  11. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Who Me?? Just a realist, if you have access to the formula then it should be very easy to work out the problem, rather than asking the forum to do the sums for you, I so sorry if if you find my reply arrogant, it would have been better if you showed the Forum your own calculations and conclusions, rather than just asking a blatant question, giving the impression that that you don't actually know how to calculate the correct cable size, this may seem arrogant, but it really is far from the truth. People who know me will tell you that I am NOT an arrogant person by nature, maybe being a bit older than most, I have come to realise there are those who know what they are about, and on the other side there are those who are chancers.
     
    • Like Like x 1
    Last edited: Jul 10, 2018
  12. andyb
    Offline

    andyb Electrician's Arms

    Location:
    West Sussex
    He's got you're number Pete ;)
     
    • Funny Funny x 5
    • Like Like x 1
    • Agree Agree x 1
  13. Matthewd29
    Offline

    Matthewd29 Regular EF Member

    Location:
    Belfast
    Just run a bit of .75 3 core flex out should be no problems
     
    • Funny Funny x 1
    • Creative Creative x 1
  14. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Shame nobody has got his. I could be accused of being a cynic, but from the tone of the original post, the Poster doesn't seem to have any intention of working this problem out for himself, rather he would just ask the forum to do it for him. Now you may say I'm wrong but I don't think so, we see it so many times and people are reluctant to say it like it is, well some at the least, I used to give the benefit of doubt, but no more. If you can't see it then I suggest you get a reality check.
     
    Last edited: Jul 10, 2018
  15. Spoon
    Offline

    Spoon Forum Mentor

    Location:
    Lancashire
    It's all in the way you read his posts mate. He is old, so doesn't beat around the bush and just states facts.... This may come across as arrogant.

    If you use BS7671 then you should have a copy. Also seeing that you are an Electrical Engineer you should know how to calculate the cable size.
    If you could post up your thought and calculations on the cable size then we would be happy to review them.
     
    • Like Like x 1
    • Agree Agree x 1
Loading...
Similar Threads - Determining size multi Forum Date
Oil Boiler cable size Electrical Forum Wednesday at 7:16 AM
Immersion wiring and amp sizes Electrical Forum Dec 4, 2018

Share This Page

Users found this page by searching for:

  1. armoured cabe size for 100Amps

    ,
  2. determin the size of armoured cable

Electricians Directory Post a Domestic Job Post a Commercial Job