Power Cables
PVC Insulated & Sheathed Unarmoured XLPE Insulated PVC/LSOH Sheathed LSOH Insulated Conduit Wires Fire Resistant Medium Voltage

Power Cables

BS 6622 Three Core Armoured 6.6kV XLPE Stranded Copper Conductors

Construction

cross-sectional area mmsq Minimum average thickness of insulation mm Nominal area of copper tape screen mmsq Nominal thickness of PVC bedding Nominal number and diameter of armoured wires no./ mm Nominal thickness of PVC oversheath mm Nominal overall diameter of cable mm
50 2.5 15.0 1.3 45/2.5 2.5 48.4
70 2.5 16.8 1.3 49/2.5 2.6 52.4
95 2.5 18.5 1.4 54/2.5 2.7 56.5
120 2.5 20.0 1.5 57/2.5 2.8 60.1
150 2.5 21.3 1.5 60/2.5 2.9 63.1
185 2.5 23.1 1.6 65/2.5 3 67.4
240 2.6 25.5 1.7 71/2.5 3.2 73.2
300 2.8 28.3 1.8 62/3.15 3.5 81.3
400 3.0 31.4 2.0 69/3.15 3.7 88.8

Installation

cross-sectional area mmsq Approximate cable weight kg/m Nominal drum length
m 		Minimum bending radius mm Nominal internal diameter of ducts mm
50 4.9 750 600 100
70 5.8 750 650 100
95 6.9 500 700 100
120 7.9 500 750 100
150 8.9 500 800 125
185 10.4 450 850 125
240 12.7 400 900 125
300 16.0 400 1000 125
400 19.4 350 1100 -

Electrical Performance

cross-sectional area mmsq Maximum DC resistance of conductor at 20 ℃ uohms/m Maximum AC resistance of conductor at 90 ℃ uohms/m Reactance at 50Hz
uohms/m 		Impedance at 50Hz uohms/m Maximum Capacitace PF/m Maximum charging current at normal voltage and frequency mA/m
50 387 494 108 506 332 0.40
70 268 343 102 358 383 0.46
95 193 248 96.2 266 432 0.52
120 153 196 93.1 217 474 0.57
150 124 159 90.8 183 511 0.61
185 99.1 128 88.1 155 562 0.67
240 75.4 98 85.9 130 602 0.72
300 60.1 80 84.7 117 622 0.75
400 47.0 64 83.2 105 648 0.78

Ratings

Cross-sectional area
mmsq 		Current Ratings Short circuit ratings
Laid direct in ground
Amps 		Drawn into ducts
Amps 		Laid in air
Amps 		One second short circuit rating of conductor
KA 		One second short circuit rating of copper per core
KA
50 210 180 220 6.8 Typically
Less
Than
1kA
70 255 215 270 9.8
95 300 255 330 13.3
120 340 290 375 17.2
150 380 330 430 21.2
185 430 370 490 26.6
240 490 425 570 34.9
300 540 470 650 43.8
400 590 520 700 57.3