www.cable-ratings.co.uk

Home
info@cable-ratings.co.uk

Technical Information for:

  • Flat Twin and Earth BS6004
  • Flat Three Core and Earth BS6004
  • Ambient temperature : 30C

    Conductor operating temperature : 70C

    CURRENT CARRYING CAPACITY (AMPS)

    Conductor
    Cross Sectional Area
    Enclosed in an insulated wall Enclosed in conduit on a wall or in trunking etc... Clipped direct
    1.0mm 11A 10A 13A 11.5A 15A 13.5A
    1.5mm 14A 13A 16.5A 15A 19.5A 17.5A
    2.5mm 18.5A 17.5A 23A 20A 27A 24A
    4.0mm 25A 23A 30A 27A 36A 32A
    6.0mm 32A 29A 38A 34A 46A 41A
    10.0mm 43A 39A 52A 46A 63A 57A
    16.0mm 57A 52A 69A 62A 85A 76A

     

    VOLTAGE DROP (PER AMPERE MTRE)
    Conductor Cross Sectional Area Two Core d.c. Two Core Cable 
    single phase a.c.
    Three or Four core cable 
    three phase a.c.
    1.0mm 44mV 44mV 38mV
    1.5mm 29mV 29mV 25mV
    2.5mm 18mV 18mV 15mV
    4.0mm 11mV 11mV 9.5mV
    6.0mm 7.3mV 7.3mV 6.4mV
    10.0mm 4.4mV 4.4mV 3.8mV
    16.0mm 2.8mV 2.8mV 2.4mV


    If cables are to be used in ambient air temperature other than 30C the following ratings should be applied.
    Ambient air temperature 30C 25 30 35 40 45 50 55 60 65
    Rating Factor 1.03 1.0 0.94 0.87 0.79 0.71 0.61 0.50 0.35


    Technical Information for:

  • XLPE/PVC/SWA/PVC ARMOURED CABLE

  • CURRENT CARRYING CAPACITY (AMPS)

    Direct Burial In Single Way Duct Air
    Nominal Conductor Area 2 Core 3 & 4 Core Nominal Conductor Area 2 Core 3 & 4 Core Nominal Conductor Area 2 Core 3 & 4 Core
    1.5mm 38 32 1.5mm 31 26 1.5mm 31 26
    2.5mm 49 42 2.5mm 41 34 2.5mm 41 35
    4.0mm 65 55 4.0mm 53 45 4.0mm 55 47
    6.0mm 81 69 6.0mm 67 56 6.0mm 70 59
    10.0mm 109 92 10.0mm 89 75 10.0mm 95 82
    16.0mm 141 119 16.0mm 115 96 16.0mm 126 107
    25.0mm 183 152 25.0mm 148 124 25.0mm 164 140
    35.0mm 219 182 35.0mm 178 149 35.0mm 202 172
    50.0mm 259 217 50.0mm 211 177 50.0mm 244 209
    70.0mm 317 266 70.0mm 260 218 70.0mm 306 263
    95.0mm 381 319 95.0mm 313 263 95.0mm 378 324
    120.0mm 433 363 120.0mm 357 300 120.0mm 437 376
    150.0mm 485 406 150.0mm 401 338 150.0mm 499 430
    185.0mm 547 458 185.0mm 455 382 185.0mm 576 495
    240.0mm 632 529 240.0mm 527 442 240.0mm 680 584
    300.0mm 708 592 300.0mm 592 496 300.0mm 775 666
    400.0mm 799 667 400.0mm 669 570 400.0mm 892 766

  • Standard depth of laying: 0.5m
  • Thermal resistivity of soil: 1.2C m/W
  • Standard ground temperature: 15C
  • Ambient air temperature: 25C
  • Maximum conductor temperature: 90C
  • For 2 core - single phase a.c., 3 & 4 core - three phase a.c. - ratings do not apply if the cable is protected by a semi-enclosed fuse to BS3036.

    For cables of 5 cores and above it is assumed only 2 cores are loaded simultaneously (ie live and neutral) and the 2 core rating should be taken. In instances where several cores are loaded simultaneously, the following rating factors should be applied to the 2 core current rating.

    Number of cores 2 3 4 5 6 7 10 12 -
    Factor 1.0 0.87 0.78 0.72 0.67 0.63 0.56 0.53 -
    Number of cores 14 19 24 27 30 37 44 46 48
    Factor 0.51 0.45 0.42 0.40 0.39 0.36 0.34 0.33 0.33

     

    If cables laid in air temperatures other than those specified the following ratings should be applied:
    Ambient air temperature 30C 25 30 35 40 45 50 55
    Rating Factor 1.0 0.96 0.92 0.88 0.83 0.78 0.73


    If cables laid in ground and single way ducts with temperatures other than those specified the following ratings should be applied:
    Ambient air temperature 30C 10 15 20 25 30 35 40
    Rating Factor 1.03 1.0 0.97 0.93 0.89 0.86 0.82


    VOLTAGE DROPS (AMPS PER METRE)
    Conductor Cross Sectional Area Two Core Cable 
    d.c.
    Two Core Cable Single Phase
    a.c.
    Three or Four Cable Three Phase
    a.c.
    1.5mm 31mV 31mV 27mV
    2.5mm 19mV 19mV 16mV
    4.0mm 12mV 12mV 10mV
    6.0mm 7.9mV 7.9mV 6.8mV
    10.0mm 4.7mV 4.7mV 4.0mV
    16.0mm 2.9mV 2.9mV 2.5mV
        r x z r x z
    25.0mm 1.85mV 1.85mV 0.160mV 1.90mV 1.60mV 0.140mV 1.65mV
    35.0mm 1.35mV 1.35mV 0.155mV 1.35mV 1.15mV 0.135mV 1.15mV
    50.0mm 0.98mV 0.99mV 0.155mV 1.00mV 0.86mV 0.135mV 0.87mV
    70.0mm 0.67mV 0.67mV 0.150mV 0.69mV 0.59mV 0.130mV 0.60mV
    95.0mm 0.49mV 0.50mV 0.150mV 0.52mV 0.43mV 0.130mV 0.45mV
    120.0mm 0.39mV 0.40mV 0.145mV 0.42mV 0.34mV 0.130mV 0.37mV
    150.0mm 0.31mV 0.32mV 0.145mV 0.35mV 0.28mV 0.125mV 0.30mV
    185.0mm 0.25mV 0.26mV 0.145mV 0.29mV 0.22mV 0.125mV 0.26mV
    240.0mm 0.195mV 0.20mV 0.140mV 0.24mV 0.175mV 0.125mV 0.21mV
    300.0mm 0.155mV 0.16mV 0.140mV 0.21mV 0.140mV 0.120mV 0.185mV
    400.0mm 0.120mV 0.13mV 0.145mV 0.195mV 0.115mV 0.125mV 0.170mV



    www.cable-ratings.co.uk