Power
Cable-Technical Details
Multicore non-armoured XLPE insulated cables current rating
CURRENT
CARRYING CAPACITY (Amperes):Ambient
temperature: 30oC
Conductor operating temperature: 90oC
APPENDIX 5
Table 5(a)
|
Conductor
Cross-Sectional Area
|
Enclosed
in conduit in thermally insulating wall etc.
|
Enclosed
in conduit on a wall or in trunking etc.
|
Open
and Cipped direct |
On
a perforated cable tray or Free air
|
|
|
|
|
|
|
|
|
|
|
|
|
Free
air
|
|
|
2
cables,
Single-Phase
a.c.
or d.c.
|
3
or 4 cables
three-phase
a.c.
|
2
cables,
Single-Phase
a.c.
or d.c.
|
3
or 4 cables
three-phase
a.c.
|
2
cables,
Single-Phase
a.c. or d.c. flat and touching
|
3
or 4 cables
three-phase
a.c.
flat
and touching or trefoil
|
2
cables,
Single-Phase
a.c. or d.c. flat and touching
|
3
or 4 cables
three-phase
a.c. flat and touching or trefoil
|
| |
|
|
|
|
|
|
|
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
|
mm2
|
A
|
A
|
A
|
A
|
A
|
A
|
A
|
A
|
|
1
|
14.5
|
13
|
17
|
15
|
19
|
17
|
21
|
18
|
|
1.5
|
18.5
|
16.5
|
22
|
19.5
|
24
|
22
|
26
|
23
|
|
2.5
|
25
|
22
|
30
|
26
|
33
|
30
|
36
|
32
|
|
4
|
33
|
30
|
40
|
35
|
45
|
40
|
49
|
42
|
|
6
|
42
|
38
|
51
|
44
|
58
|
52
|
63
|
54
|
|
10
|
57
|
51
|
69
|
60
|
80
|
71
|
86
|
75
|
|
16
|
76
|
68
|
91
|
80
|
107
|
96
|
115
|
100
|
|
25
|
99
|
89
|
119
|
105
|
138
|
119
|
149
|
127
|
|
35
|
121
|
109
|
146
|
128
|
171
|
147
|
185
|
158
|
|
50
|
145
|
130
|
175
|
154
|
209
|
179
|
225
|
192
|
|
70
|
183
|
164
|
221
|
194
|
269
|
228
|
289
|
246
|
|
95
|
220
|
197
|
265
|
233
|
328
|
278
|
352
|
298
|
|
120
|
253
|
227
|
305
|
268
|
382
|
322
|
410
|
346
|
|
150
|
290
|
259
|
334
|
300
|
441
|
371
|
473
|
399
|
|
185
|
329
|
295
|
384
|
340
|
506
|
424
|
542
|
456
|
|
240
|
386
|
346
|
459
|
398
|
599
|
500
|
641
|
538
|
|
300
|
442
|
396
|
532
|
455
|
693
|
576
|
741
|
621
|
|
400
|
-
|
-
|
625
|
536
|
803
|
667
|
865
|
741
|
Note:
1. With or without
protective conductor.
2. For cables in rigid PVC
conduit, the value stated in A6(2) are applicable.
3. Cirecular
conductors are assumed for sizes up to and including 16mm2. Value
for larger sizes related to shaped conductors and may safely
be applied to circular
conductors.
4. For
details, please refer to BS7671:2001 Tale 4E2A
VOLTAGE
DROP (millivolt per amperes per metre):Conductor
operating temperature: 90oC
Table 5(b)
|
Conductor
Cross-Sectional Area
|
Two-core
cable d.c.
|
Two
core cable single phase a.c.
|
Three
or four-core cable three-phase a.c.
|
|
mm2
|
mV/A/m
|
mV/A/m
|
mV/A/m
|
|
|
46
|
46
|
40
|
|
1.5
|
31
|
31
|
27
|
|
2.5
|
19
|
19
|
16
|
|
4
|
12
|
12
|
10
|
|
6
|
7.9
|
7.9
|
6.8
|
|
10
|
4.7
|
4.7
|
4.0
|
|
16
|
2.9
|
2.9
|
2.5
|
|
|
|
r
|
x
|
Z
|
r
|
x
|
Z
|
|
25
|
1.85
|
1.85
|
0.160
|
1.90
|
1.60
|
0.140
|
1.65
|
|
35
|
1.35
|
1.35
|
0.155
|
1.35
|
1.15
|
0.135
|
1.15
|
|
50
|
0.98
|
0.99
|
0.155
|
1.00
|
0.86
|
0.135
|
0.87
|
|
70
|
0.67
|
0.67
|
0.150
|
0.69
|
0.59
|
0.130
|
0.60
|
|
95
|
0.49
|
0.50
|
0.150
|
0.52
|
0.43
|
0.130
|
0.45
|
|
120
|
0.39
|
0.40
|
0.145
|
0.42
|
0.34
|
0.130
|
0.37
|
|
150
|
0.31
|
0.32
|
0.145
|
0.35
|
0.28
|
0.125
|
0.30
|
|
185
|
0.25
|
0.26
|
0.145
|
0.29
|
0.22
|
0.125
|
0.26
|
|
240
|
0.195
|
0.200
|
0.140
|
0.24
|
0.175
|
0.125
|
0.21
|
|
300
|
0.155
|
0.160
|
0.140
|
0.21
|
0.140
|
0.120
|
0.185
|
|
400
|
0.120
|
0.130
|
0.140
|
0.190
|
0.115
|
0.120
|
0.165
|
Note:
1.
For details, please refer to BS7671:2001 Tale 4E2B
Correction
Factors for Sizing of Cable Conductors
(1)Correction factors for ambient temperature
APPENDIX 1
Table 1(a)
|
Type
of insulation |
Operating
temperature |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
25
|
30
|
35
|
40
|
45
|
50
|
55
|
60
|
65
|
70
|
75
|
80
|
85
|
90
|
95
|
|
|
General
purpose PVC
|
70oC
|
1.03
|
1.0
|
0.94
|
0.87
|
0.79
|
0.71
|
0.61
|
0.50
|
0.35
|
-
|
-
|
-
|
-
|
-
|
-
|
|
|
|
|
|
Heat
resisting PVC
|
90oC
|
1.03
|
1.0
|
0.97
|
0.94
|
0.91
|
0.87
|
0.84
|
0.80
|
0.76
|
0.71
|
0.61
|
0.50
|
0.35
|
-
|
-
|
|
|
|
Thermosetting
(XLPE)
|
90oC
|
1.02
|
1.0
|
0.96
|
0.91
|
0.87
|
0.82
|
0.76
|
0.71
|
0.65
|
0.58
|
0.50
|
0.41
|
0.29
|
-
|
-
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1.For
details, please refer to BS7671:2001 Tale 4C1
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