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Power Cables |  |
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Power Cables
BS 6622 Three Core Armoured 22KV XLPE Stranded Copper Conductors
Construction
cross-sectional area mmsq |
Minimum average thickness of insulation mm |
Nominal diameter over insulation
|
Nominal thickness of PVC bedding |
Nominal number and diameter of armoured wires no./mm |
Nominal thickness of PVC oversheath |
Nominal overall diameter of cable mm |
50 |
5.5 |
21.6 |
1.5 |
61/2.5 |
2.9 |
63.8 |
70 |
5.5 |
23.4 |
1.6 |
66/2.5 |
3.0 |
68.1 |
95 |
5.5 |
25.1 |
1.7 |
70/2.5 |
3.2 |
72.3 |
120 |
5.5 |
26.6 |
1.7 |
59/3.15 |
3.3 |
77.1 |
150 |
5.5 |
27.9 |
1.8 |
62/3.15 |
3.4 |
80.3 |
185 |
5.5 |
29.7 |
1.9 |
65/3.15 |
3.6 |
84.7 |
240 |
5.5 |
31.9 |
2.0 |
70/3.15 |
3.7 |
89.9 |
300 |
5.5 |
34.2 |
2.0 |
74/3.15 |
3.9 |
95.2 |
400 |
5.5 |
36.9 |
2.2 |
79/3.15 |
4.1 |
101.9 |
Installation
cross-sectional area mmsq |
Approximate cable weight kg/m |
Nominal drum length |
Minimum bending radius mm |
Nominal internal diameter of ducts mm |
50 |
6.8 |
500 |
1000 |
100 |
70 |
7.8 |
500 |
1050 |
125 |
95 |
9.1 |
350 |
1100 |
125 |
120 |
11.0 |
350 |
1200 |
125 |
150 |
12.1 |
350 |
1250 |
125 |
185 |
13.8 |
300 |
1300 |
125 |
240 |
16.1 |
250 |
1350 |
125 |
300 |
18.4 |
250 |
1450 |
150 |
400 |
21.7 |
250 |
1550 |
150 |
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 |
Impedance at 50Hz uohms/m |
Maximum Capacitace PF/m |
Maximum charging current at normal voltage and frequency mA/m |
50 |
387 |
494 |
129.0 |
510 |
183 |
0.73 |
70 |
268 |
348 |
121.0 |
363 |
207 |
0.83 |
95 |
193 |
248 |
114.0 |
272 |
229 |
0.92 |
120 |
153 |
196 |
110.0 |
225 |
249 |
1.00 |
150 |
124 |
159 |
107.0 |
191 |
266 |
1.06 |
185 |
99.1 |
128 |
103.0 |
164 |
289 |
1.16 |
240 |
75.4 |
98 |
99.5 |
139 |
318 |
1.27 |
300 |
60.1 |
80 |
94.4 |
123 |
348 |
1.39 |
400 |
47.0 |
64 |
91.2 |
111 |
383 |
1.53 |
Ratings
Cross-sectional area |
Current Ratings |
Short circuit ratings |
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Laid direct in ground |
Drawn into ducts |
Laid in air |
One second short circuit rating of conductor |
One second short circuit rating of copper per core |
|
50 |
210 |
185 |
225 |
6.8 |
Typically less then 1kA |
70 |
255 |
225 |
275 |
9.8 |
|
95 |
295 |
260 |
330 |
13.3 |
|
120 |
335 |
300 |
380 |
17.2 |
|
150 |
375 |
335 |
430 |
21.2 |
|
185 |
420 |
380 |
490 |
26.6 |
|
240 |
480 |
430 |
570 |
34.9 |
|
300 |
530 |
480 |
650 |
43.8 |
|
400 |
580 |
530 |
720 |
57.3 |
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