Nominal cross sectional area |
Nominal
Thickness
of
Insula-tion |
Minimum
thickness
of Inner
sheath |
Armour |
Nominal
thickness
of Outer
sheath |
Approx overall
diameter |
Max DC
conductor
resistance
at 20° C |
CURRENT RATINGS |
Galv.
Round
Steel Wire
Nominal
diameter |
Galv.
Flat
Steel Strip
Nominal
thick-ness |
Direct in
Ground |
In
Duct |
In Air |
Sq. mm |
mm |
mm. |
mm. |
mm |
mm. |
mm. |
Ohm/km |
Amps. |
Amps. |
Amps. |
1.5 |
0.8 |
0.3 |
1.4 |
_ |
1.8 |
13.6 |
18.1 |
18 |
16 |
16 |
2.5* |
0.9 |
0.3 |
1.4 |
- |
1.8 |
14.8 |
12.1 |
25 |
21 |
21 |
4* |
1.0 |
0.3 |
1.4 |
- |
1.8 |
16.2 |
7.4 |
32 |
27 |
27 |
6* |
1.0 |
0.3 |
1.4 |
- |
1.8 |
17.2 |
4.61 |
40 |
34 |
35 |
10* |
1.0 |
0.3 |
1.4 |
- |
1.8 |
18.3 |
3.08 |
55 |
45 |
47 |
16 |
1.0 |
0.3 |
- |
0.8 |
2.0 |
19.7 |
1.91 |
70 |
58 |
59 |
25 |
1.2 |
0.3 |
- |
0.8 |
2.0 |
21.2 |
1.20 |
90 |
76 |
78 |
35 |
1.2 |
0.3 |
- |
0.8 |
2.0 |
22.9 |
0.868 |
110 |
92 |
99 |
50 |
1.4 |
0.3 |
- |
0.8 |
2.0 |
25.6 |
0.641 |
135 |
115 |
125 |
70 |
1.4 |
0.3 |
- |
0.8 |
2.0 |
28.2 |
0.443 |
160 |
140 |
150 |
95 |
1.6 |
0.3 |
- |
0.8 |
2.2 |
32.1 |
0.320 |
190 |
170 |
185 |
120 |
1.6 |
0.4 |
- |
0.8 |
2.2 |
34.5 |
0.253 |
210 |
190 |
210 |
150 |
1.8 |
0.4 |
- |
0.8 |
2.2 |
37.5 |
0.206 |
240 |
210 |
240 |
185 |
2.0 |
0.4 |
- |
0.8 |
2.4 |
41.4 |
0.164 |
275 |
240 |
275 |
240 |
2.2 |
0.5 |
- |
0.8 |
2.6 |
46.8 |
0.125 |
320 |
275 |
325 |
300 |
2.4 |
0.5 |
- |
0.8 |
2.8 |
51.4 |
0.100 |
355 |
305 |
365 |
400 |
2.6 |
0.6 |
- |
0.8 |
3.0 |
56.9 |
0.0778 |
385 |
345 |
420 |
500 |
3.0 |
0.6 |
- |
0.8 |
3.2 |
63.4 |
0.0605 |
410 |
370 |
450 |
630 |
3.4 |
0.7 |
- |
0.8 |
3.4 |
71.5 |
0.0469 |
435 |
390 |
490 |