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

BS 6622 Single Core Armoured 6.6kV XLPE Stranded Aluminium Conductor

Construction

Size mm2 Minimum Average Thickness of Insulation mm Nominal Area of Copper Tape Screen
mm2		 Nominal Thickness of Bedding Nominal number and diameter of armoured wires no./ mm Nominal Thickness of Sheath mm Nominal Overall Diameter mm
70 2.5 16.8 1.2 38/1.6 1.8 27.5
95 2.5 18.5 1.2 41/1.6 1.9 29.4
120 2.5 20 1.2 44/1.6 1.9 30.9
150 2.5 21.3 1.2 46/1.6 2.0 32.4
185 2.5 23.1 1.2 40/2.0 2.0 35.0
240 2.6 25.5 1.2 43/2.0 2.1 37.6
300 2.8 28.3 1.2 47/2.0 2.2 40.8
400 3 31.4 1.2 51/2.0 2.3 44.1
500 3.2 34.7 1.3 46/2.5 2.5 49.0
630 3.2 38.6 1.4 50/2.5 2.6 53.3

Installation

Size mm2 Approximate Cable Weight kg/m Nominal Drum Length
m 		Minimum Bending Radius mm Nominal Internal Diameter of Ducts mm
70 1.0 1000 450 100
95 1.2 1000 450 100
120 1.3 1000 500 100
150 1.5 500 500 100
185 1.7 500 550 100
240 2.0 500 600 100
300 2.4 500 650 100
400 2.8 500 700 100
500 3.4 300 750 100
630 4.1 300 800 100

Electrical Performance

Size mm2 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
70 443 568 125 582 371 0.45
95 320 410 119 427 417 0.50
120 253 325 114 344 459 0.55
150 206 265 111 288 494 0.59
185 164 211 109 238 543 0.65
240 125 161 105 193 583 0.70
300 100 130 103 167 602 0.72
400 77.8 102 99.9 143 627 0.75
500 60.5 81.0 99.2 129 654 0.79
630 46.9 64.0 95.5 116 737 0.87

Ratings

Size
mm2		 Current Ratings Short circuit ratings
Laid 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
70 210 210 240 6.3 -
95 250 245 295 8.5 -
120 280 275 335 11.0 Typically
150 315 300 380 13.5 Less
185 355 335 435 17.0 Then
240 405 380 510 22.3 1kA
300 455 420 580 28.0 -
400 510 455 670 36.6 -
500 570 500 770 46.2 -
630 640 550 880 58.3 -