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Service Entrance/Feeder Conductors

Discussion in 'Electrical Engineering' started by Kissi Asiedu, Jan 29, 2006.

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  1. Kissi Asiedu

    Kissi Asiedu Guest

    In my country Ghana, most houses have a 3 phase 4 wire system at 220-240
    volts. Some if not most electricians use 16mm2 THHN wire to connect from the
    service point, through the watt hour meter and to the load center. This is
    for 200 amp service. I thought a 200 amp service would require 2/0 cable for
    such service. In reference, 16mm2 is equivalent to #6. Is this type of cable
    efficient for such service?
     
  2. In UK, IIRC (don't have tables on me), 16mm2 tails are for 60A max
    service. 25mm2 tails are used for 100A service. Is your 200A service
    200A per phase, or 200A total on all 3 phases (in which case 16mm2
    would be about right)?
     
  3. SQLit

    SQLit Guest

    #2 out of the NEC for North America table 310-16 75C is 115 amps.
    #2 in free air table 310-20 is 135 amps. (75C)

    2/0, 310-16 is 175 amps. (75C)
    2/0 in free air is 265 amps (75C)

    Where I live in Phoenix. Service conductors for a 200 amp service must be at
    least 4/0 copper or 250 mcm Al. We MUST use the derating factors at the
    bottom of the tables for heat. I like to see all the equipment that I
    install outside rated for above 40C preferably 50C. It does get that toasty
    here.

    I have never done any electrical work other than in North America so your
    conditions WILL be different.
    If you have 3 phase I am surprised that you need anything larger than 100
    amps.
     
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