UNIVERSAL CABLES LIMITED

Date: 17th June 2016
Single Core Cables To BS 6622
Single Core Medium Power Cable to BS 6622 Application: The single core cables are designed for distribution of electrical power with nominal voltage Uo/U ranging from 3.8/6.6KV to 19/33KV and frequency 50Hz. They are suitable for installation mostly in power supply stations,Website:http://www.ue-cable.com, indoors and in cable ducts, outdoors, underground and in water as well as for installation on cable trays for industries, switchboards and power stations. Standards: BS 6622 BS 7835 (LSZH) Conductor: Plain annealed copper or aluminium complying with IEC 60228/BS 6360. Copper conductors shall be stranded (class 2) and aluminium conductors shall be either solid or stranded (class 2). Conductor Screen: Extruded layer of semi-conducting cross-linkable compound is applied over the conductor and shall cover the surface completely. The minimum thickness is 0.3mm and the maximum resistivity shall not exceed 500 Ohm-m at 90?C. Insulation: Insulation is of cross-linked polyethylene compound XLPE (GP8) conforming to BS 7655-1.3 or EPR (GP7), conforming to BS 7655-1.2. Table 1. Insulation Thickness ? ? ?Nom. Cross Section Area Insulation Thickness at Nominal Voltage 3.8/6.6KV (Um=7.2KV) 6.35/11KV (Um=12KV) 8.7/15KV(Um=17.5KV) 12.7/22KV(Um=24KV) 19/33KV(Um=36KV) mm? mm mm mm mm mm 70 - 185 2.5 3.4 4.5 5.5 8.0 240 2.6 3.4 4.5 5.5 8.0 300 2.8 3.4 4.5 5.5 8.0 400 3.0 3.4 4.5 5.5 8.0 Above 500 3.2 3.4 4.5 5.5 8.0 Insulaton Screen Extruded layer of semi-conducting cross-linkable compound is applied over the insulation. The extruded semi-conducting layer shall consist of bonded or cold strippable semi-conducting compound capable of removal for jointing or terminating. As an option, a semi- conducting tape may be applied over the extruded semi-conducting layer as a bedding for the metallic layer. The minimum thickness is 0.3 mm and the maximum resistivity is 500 Ohm-m at 90?. The screen is tightly fitted to the insulation to exclude all air voids and can be easily hand stripped on site. Metallic Layer The metallic layer shall consist of either copper tapes or a concentric layer of copper wires or a combination of tapes and wires. The metallic layer provides an earth fault current path, capable of withstanding fault current to earth of 1000A for one second at maximum temperature 160?. Copper wires are applied over the conducting water blocking layer with a minimum diameter of 0.5mm. And over the copper wires, copper tape with minimum thickness of 0.1mm can be applied helically with overlap. Total cross section of copper wire screen layer is shown in table 2. Table 2. Minimum Total Cross Section of Copper Wire Screen & DC Resistance of the screen Nominal Cross-Section of Cables Minimum Cross-Section of Copper Wire Screen DC Resistance of the Copper Wire Screen at 20? mm2 Mm2 ? up to 120 16 1.06 150-300 25 0.72 400-630 35 0.51 Separation Sheath (for armoured cable) The separation sheath comprises a layer of extruded PVC, PE or LSZH. The nominal thickness is calculated by 0.02Du + 0.6mm where Du is the fictitious diameter under the sheath in mm. The nominal separation sheath thickness shall not be less than 1.2mm. Armour (for armoured cable) The armour consists of round aluminium wire with diameter specified as in Table 3. Table 3. Armour Wire Diameter Fictitious Diameter Under the Armour Armour Wire Diameter mm mm > << p="">< 25 1.6 25 35 2 35 60 2.5 60 - 3.15 Over Sheath Overall sheath comprises a layer of extruded either PVC type 9 conforming to BS 7665-4.2 or MDPE type TS2 conforming to BS 7655-10.1. LSZH can be offered as an option. The oversheath is normally black in colour. When a DC voltage test is to be performed on the oversheath, a semi-conducting layer such as graphite coating shall be applied over the surface of the extruded oversheath. The nominal oversheath thickness is calculated by 0.035+D where D is the diameter immediately under the oversheath in mm. For cables with the oversheath not applied over the armour, the nominal oversheath thickness shall not be less than 1.4mm. And for cables with oversheath applied over the armour, the nominal oversheath thickness shall not be less than 1.8mm. Physical Properties Operating Temperature: up to 90?C Temperature Range: -5?C ( PVC sheath ); -20?C ( PE sheath ) Short Circuit Temperature: 250?C (short circuit duration up to 5 seconds) Bending Radius: 12 x OD Table 4. Nominal /Operating /Test Voltages Rated Voltage Uo/U Operating Voltage (Um) Testing Voltage (rms) 3.8/6.6KV 7.2KV 15KV 6.35/11KV 12KV 25.5KV 8.7/15KV 17.5KV 35KV 12.7/22KV 24KV 51KV 19/33KV 36KV 76KV Single Core 3.8/6.6KV (Um=7.2KV) Dimensional Data ?Nom. Cross-Section Area Unarmoured ?Cables Aluminium Wire Armoured Cables Nom. Insu lation Thick ness Copper Wire Screen Area Nom. Sheath Thick ness Approx. Overall Diameter App rox. Weight Copper Tape Screen Area Nom. Bedding Thic kness Nom. Armour Wire Diam eter Nom. Sheath Thick ness Approx. Ove rall Diam eter App rox. Weight Cu AL Cu AL mm2 mm mm2 mm mm kg/km mm2 mm mm mm mm kg/km 25 2.5 16 1.5 20.3 750 580 3.4 1.2 1.6 1.8 26.3 1150 1000 35 2.5 16 1.6 21.3 870 650 3.6 1.2 1.6 1.8 27.3 1250 1050 50 2.5 16 1.6 22.4 1090 770 3.9 1.2 1.6 1.8 28.4 1500 1190 70 2.5 16 1.7 24.2 1310 870 4.3 1.2 1.6 1.8 30.0 1740 1300 95 2.5 16 1.7 25.8 1560 960 4.7 1.2 1.6 1.9 31.8 2030 1430 120 2.5 16 1.8 27.4 1830 1070 5.0 1.2 1.6 1.9 33.2 2310 1550 150 2.5 25 1.8 29.1 2130 1190 5.3 1.2 1.6 2.0 35.1 2660 1720 185 2.5 25 1.9 30.8 2490 1320 5.8 1.2 2.0 2.0 37.4 3120 1950 240 2.6 25 1.9 33.5 3040 1520 6.3 1.2 2.0 2.1 40.3 3740 2200 300 2.8 25 2.0 36.1 3650 1770 7.0 1.2 2.0 2.2 42.9 4400 2520 400 3.0 35 2.2 40.6 4680 2170 7.7 1.2 2.0 2.3 47.2 5490 2960 500 3.2 35 2.3 43.6 5670 2570 8.5 1.3 2.5 2.5 51.6 6760 3660 630 3.2 35 2.4 48.8 6980 2990 9.5 1.4 2.5 2.6 57.0 8200 4160 Electrical Data ? ? ? ? ? ? ??Nom. Cross- Section Area Unar moured Cables Alu minium Wire Armou red Cables D C Resis tance CU / AL A C Resis tance CU / AL Short Circuit Rating of Con ductor CU / AL 1 sec Capaci- tance Char ging Cur rent Short Circuit Rating of Copper Wire Screen 1 sec Short Circuit Rating of Copper Tape Screen 1 sec Reac tance Induc tance Impe dance Trefoil Flat spaced Trefoil Flat Spaced Tre foil Flat Spaced Cu AL Cu AL mm2 ??/m ??/m kA pF/m mA/m kA kA ??/m ??/m nH/m nH/m ??/ m ??/m 25 727/1200 927/1538 3.6/2.3 263 0.32 2.6 0.4 136 194 400 590 936 1544 952 1554 35 524/868 668/1113 5.0/3.2 291 0.35 2.6 0.5 127 185 390 580 679 1121 695 1131 50 387/641 494/822 6.8/4.4 321 0.39 2.6 0.5 121 179 380 570 511 834 527 844 70 268/443 343/568 9.8/6.3 371 0.45 2.6 0.6 115 173 370 550 364 583 386 597 95 193/320 248/410 13.3/8.5 417 0.50 2.6 0.6 110 168 350 540 272 427 300 446 120 153/253 196/325 17.2/11.0 459 0.55 2.6 0.7 107 165 340 520 225 345 257 367 150 124/206 159/265 21.2/13.5 494 0.59 4.3 0.7 103 161 330 510 193 287 229 313 185 99.1/164 128/211 26.6/17.0 543 0.65 4.3 0.8 100 158 320 500 165 237 206 267 240 75.4/125 98/161 34.9/22.3 583 0.70 4.3 0.9 97 155 310 490 140 191 185 226 300 60.1/100 80/130 43.8/28.0 602 0.72 4.3 1.0 95 153 300 490 126 163 174 203 400 47.0/77.8 64/102 57.3/36.6 627 0.75 5.8 1.1 92 150 290 480 113 141 164 184 500 36.6/60.5 51/81 72.3/46.2 654 0.79 5.8 1.2 90 149 290 470 105 124 158 171 630 28.3/46.9 42/64 91.2/58.3 726 0.87 5.8 1.3 87 145 280 460 97 110 151 160 Single Core 6.35/11KV (Um=12KV) Dimensional Data Nom. Cross- Section Area Unarmoured Cables Aluminium Wire Armoured Cables Nom. Insulation Thickness Copper Wire Screen Area Nom. Sheath Thickness Approx. Overall Diameter Approx. Weight Copper Tape Screen Area Nom. Bedding Thickness Nom. Armour Wire Diameter Nom. Sheath Thickness Approx. Overall Diameter App ? rox. Weight Cu AL Cu AL mm2 mm mm2 mm mm kg/km mm2 mm mm mm mm kg/km 25 3.4 16 1.5 22.1 960 740 3.8 1.2 1.6 1.8 28.1 1300 780 35 3.4 16 1.6 23.3 1060 790 4.1 1.2 1.6 1.8 29.1 1400 1180 50 3.4 16 1.7 24.4 1160 840 4.4 1.2 1.6 1.8 30.2 1600 1280 70 3.4 16 1.7 26.0 1370 930 4.7
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