Technical Information for :

Flat Twin & Earth BS6004             
 Flat  Three Core & Earth BS600
4


Ambient temperature  : 30ºC
Conductor operating temperature : 70ºC 

CURRENT-CARRYING CAPACITY (AMPS)

Conductor cross sectional areaenclosed in an insulated wallenclosed in conduit on a wall or in trunking etc.clipped direct
1.0mm²11A10A13A11.5A15A13.5A
1.5mm²14A13A16.5A15A19.5A17.5A
2.5mm²18.5A17.5A23A20A27A24A
4.0mm²25A23A30A27A36A32A
6.0mm²32A29A38A34A46A41A
10.0mm²43A39A52A46A63A57A
16.0mm²57A52A69A62A85A76A

 

VOLTAGE DROP (PER AMPERE PER METRE)
Conductor cross sectional areaTwo-core d.c.Two-core cable single phase a.c.Three or four core cable three phase a.c.
1.0mm²44mV44mV38mV
1.5mm²29mV29mV25mV
2.5mm²18mV18mV15mV
4.0mm11V11mV9.5mV
6.0mm²7.3mV7.3mV6.4mV
10.0mm²4.4mV4.4mV3.8mV
16.0mm²2.8mV2.8mV2.4mV

 

If cables are to be used in ambient air temperature other than 30ºC the following rating factors should be applied

Ambient air temperature °C253035404550556065
Rating Factor1.031.00.940.870.790.710.610.500.35

    XLPE/PVC/SWA/PVC ARMOURED CABLE

CURRENT CARRYING CAPACITY (AMPS)
Direct BurialIn Single-Way DuctAir
Nominal conductor area2 Core3 & 4 CoreNominal conductor area2 Core3 & 4 CoreNominal conductor area2 Core3 & 4 Core
1.5mm²38321.5mm²31261.5mm²3126
2.5mm²49422.5mm²41342.5mm²4135
4.0mm²65554.0mm²53454.0mm²5547
6.0mm²81696.0mm²67566.0mm²7059
10.0mm²1099210.0mm²897510.0mm²9582
16.0mm²14111916.0mm²1159616.0mm²126107
25.0mm²18315225.0mm²14812425.0mm²164140
35.0mm²21918235.0mm²17814935.0mm²202172
50.0mm²25921750.0mm²21117750.0mm²244209
70.0mm²31726670.0mm²26021870.0mm²306263
95.0mm²38131995.0mm²31326395.0mm²378324
120.0mm²433363120.0mm²357300120.0mm²437376
150.0mm²485406150.0mm²401338150.0mm²499430
185.0mm²547458185.0mm²455382185.0mm²576495
240.0mm²632529240.0mm²527442240.0mm²680584
300.00mm²708592300.00mm²592496300.00mm²775666
400.00mm²799667400.00mm²669570400.00mm²892766

    Standard depth of laying                    0.5m
    Thermal resistivity of soil                    1.2°C m/W
    Standard ground temperature            15°C
    Ambient air temperature                    25°C
    Maximum conductor temperature      90°C
    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 cores2345671012-
Factor1.00.870.780.720.670.630.560.53-
Number of cores141924273037444648
Factor0.510.450.420.400.390.360.340.330.33

For cables laid in air temperatures other than those specified the following rating factors should be applied:

Ambient air temp ºC25303540455055
Rating Factor1.00.960.920.880.830.780.73

For cables laid in ground and single way ducts with temperatures other than those specified the following rating factors should be applied:                 

Ambient air temp ºC10152025303540
Rating Factor1.031.00.970.930.890.860.82

 

VOLTAGE DROP (AMPS PER METRE)

Conductor cross sectional areaTwo core cable d.c.Two core cable single phase a.c.Three or four core cable three phase a.c.
1.5mm²31mV31mV27mV
2.5mm²19mV19mV16mV
4.0mm²12mV12mV10mV
6.0mm²7.9mV7.9mV6.8mV
10.0mm²4.7mV4.7mV4.0mV
16.0mm²2.9mV2.9mV2.5mV
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25.0mm²1.85mV1.85mV0.160mV1.90mV1.60mV0.140mV1.65mV
35.0mm²1.35mV1.35mV0.155mV1.35mV1.15mV0.135mV1.15mV
50.0mm²0.98mV0.99mV0.155mV1.00mV0.86mV0.135mV0.87mV
70.0mm²0.67mV0.67mV0.150mV0.69mV0.59mV0.130mV0.60mV
95.0mm²0.49mV0.50mV0.150mV0.52mV0.43mV0.130mV0.45mV
120.0mm²0.39mV0.40mV0.145mV0.42mV0.34mV0.130mV0.37mV
150.0mm²0.31mV0.32mV0.145mV0.35mV0.28mV0.125mV0.30mV
185.0mm²0.25mV0.26mV0.145mV0.29mV0.22mV0.125mV0.26mV
240.0mm²0.195mV0.20mV0.140mV0.24mV0.175mV0.125mV0.21mV
300.0mm²0.155mV0.16mV0.140mV0.21mV0.140mV0.120mV0.185mV
400.0mm²0.120mV0.13mV0.145mV0.195mV0.115mV0.125mV0.170mV