3 phase cable size ?

Discussion in 'General Electronics Chat' started by Man_in_UK, Feb 27, 2009.

  1. Man_in_UK

    Thread Starter Senior Member

    May 13, 2008
    132
    0
    I don't go near 3 phase stuff but a friend has asked me to get some flex to wire up a heater, trouble is I don't know what mm2 he will need.

    2200KW @ 415v

    Any ideas as to what I need ?
    Cheers
     
  2. b.shahvir

    Active Member

    Jan 6, 2009
    444
    0
    He would need 2.5 sq. mm. Cu flex wire for heater wiring........... 3 runs if heater is Delta connected, 4 runs if heater has a star connection which includes provision for neutral wire. Obviously earthing wire has to be considered seperately.
    Hope this helps.
     
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Wire size is based on current drawn by the load, not on voltage or phase or application. 2200KW divided by 415V is 5.3KA. Wire will need to be 2015 sqmm or larger. Are you sure the 2200KW figure is correct?
     
    Last edited: Feb 27, 2009
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    Hello,

    The "normal" wire sizes are:

    10 A => 1.5 mm^2
    16 A => 2.5 mm^2
    32 A => 4 mm^2

    Greetings,
    Bertus
     
  5. Man_in_UK

    Thread Starter Senior Member

    May 13, 2008
    132
    0

    Yeah I'm not sure about this one ...... I like the look of b.shahvir idea of 2.5 a lot better.

    Thanks for the suggestions, they have helped.

    EDIT
    Come to think of it .... he did say it was 2200KW, that is a silly figure. I know the bloke likes to keep warm but there might be a mistake in here somewhere.... and he said he wanted to run 2 of them !
     
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