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Technical Information for:

  • Flat Twin and Earth BS6004
  • Flat Three Core and Earth BS6004

    • Ambient temperature  : 30ºC

    Conductor operating temperature : 70ºC

    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
    1.0mm² 11A 10A 13A 11.5A 15A 13.5A
    1.5mm² 14A 13A 16.5A 15A 19.5A 17.5A
    2.5mm² 18.5A 17.5A 23A 20A 27A 24A
    4.0mm² 25A 23A 30A 27A 36A 32A
    6.0mm² 32A 29A 38A 34A 46A 41A
    10.0mm² 43A 39A 52A 46A 63A 57A
    16.0mm² 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.
    1.0mm² 44mV 44mV 38mV
    1.5mm² 29mV 29mV 25mV
    2.5mm² 18mV 18mV 15mV
    4.0mm² 11mV 11mV 9.5mV
    6.0mm² 7.3mV 7.3mV 6.4mV
    10.0mm² 4.4mV 4.4mV 3.8mV
    16.0mm² 2.8mV 2.8mV 2.4mV


    If cables are to be used in ambient air temperature other than 30ºC the following ratings should be applied.
    Ambient air temperature 30ºC 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)
    Clipped Direct In Free Air Direct in Ground or Ducting
    Nominal Conductor Area 2 Core 3 & 4 Core Nominal Conductor Area 2 Core 3 & 4 Core Nominal Conductor Area 2 Core 3 & 4 Core
    1.5mm² 27 23 1.5mm² 29 25 1.5mm² 25 21
    2.5mm² 36 31 2.5mm² 39 33 2.5mm² 33 28
    4.0mm² 49 42 4.0mm² 52 44 4.0mm² 43 36
    6.0mm² 62 53 6.0mm² 66 56 6.0mm² 53 44
    10.0mm² 85 73 10.0mm² 90 78 10.0mm² 71 58
    16.0mm² 110 94 16.0mm² 115 99 16.0mm² 91 75
    25.0mm² 146 124 25.0mm² 152 131 25.0mm² 116 96
    35.0mm² 180 154 35.0mm² 188 162 35.0mm² 139 115
    50.0mm² 219 187 50.0mm² 228 197 50.0mm² 164 135
    70.0mm² 279 238 70.0mm² 291 251 70.0mm² 203 167
    95.0mm² 338 289 95.0mm² 354 304 95.0mm² 239 197
    120.0mm² 392 335 120.0mm² 410 353 120.0mm² 271 223
    150.0mm² 451 386 150.0mm² 472 406 150.0mm² 306 251
    185.0mm² 515 441 185.0mm² 539 463 185.0mm² 343 281
    240.0mm² 607 520 240.0mm² 636 546 240.0mm² 395 324
    300.0mm² 698 599 300.0mm² 732 628 300.0mm² 446 365
    400.0mm² 787 673 400.0mm² 847 728 400.0mm² - -

  • Standard depth of laying: 0.5m
  • Thermal resistivity of soil: 1.2ºC m/W
  • Standard ground temperature: 20ºC
  • Ambient air temperature: 30ºC
  • Maximum conductor temperature: 90ºC

    • 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 30ºC 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 30ºC 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.
    1.5mm² 31mV 31mV 27mV
    2.5mm² 19mV 19mV 16mV
    4.0mm² 12mV 12mV 10mV
    6.0mm² 7.9mV 7.9mV 6.8mV
    10.0mm² 4.7mV 4.7mV 4.0mV
    16.0mm² 2.9mV 2.9mV 2.5mV
        r x z r x z
    25.0mm² 1.85mV 1.85mV 0.160mV 1.90mV 1.60mV 0.140mV 1.65mV
    35.0mm² 1.35mV 1.35mV 0.155mV 1.35mV 1.15mV 0.135mV 1.15mV
    50.0mm² 0.98mV 0.99mV 0.155mV 1.00mV 0.86mV 0.135mV 0.87mV
    70.0mm² 0.67mV 0.67mV 0.150mV 0.69mV 0.59mV 0.130mV 0.60mV
    95.0mm² 0.49mV 0.50mV 0.150mV 0.52mV 0.43mV 0.130mV 0.45mV
    120.0mm² 0.39mV 0.40mV 0.145mV 0.42mV 0.34mV 0.130mV 0.37mV
    150.0mm² 0.31mV 0.32mV 0.145mV 0.35mV 0.28mV 0.125mV 0.30mV
    185.0mm² 0.25mV 0.26mV 0.145mV 0.29mV 0.22mV 0.125mV 0.26mV
    240.0mm² 0.195mV 0.20mV 0.140mV 0.24mV 0.175mV 0.125mV 0.21mV
    300.0mm² 0.155mV 0.16mV 0.140mV 0.21mV 0.140mV 0.120mV 0.185mV
    400.0mm² 0.120mV 0.13mV 0.145mV 0.195mV 0.115mV 0.125mV 0.170mV


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