Short Circuit Current Ratings
The short circuit currents quoted here are for cables operating normally at maximum conductor temperature of 90℃.
XLPE insulation is actually capable of withstanding short-term temperature up to 250℃.
According to ICEA P-32-382 Curves based on formula:
I: Short circuit current (kA)
A: Conductor area (mm² )
T1: Operating temperature (85℃)
T2: Short circuit temperature (250℃)
t: Short circuit duration (sec)
T1 = 90, T2 = 250
|
Nominal Area |
Short Circuit Current(kA) |
|||||||||||||
|
Duration of Short Circuit in Second |
||||||||||||||
|
(mm²) |
0.03 |
0.05 |
0.07 |
0.1 |
0.14 |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1.0 |
|
1.5 |
1.26 |
0.98 |
0.83 |
0.69 |
0.58 |
0.49 |
0.40 |
0.35 |
0.31 |
0.28 |
0.26 |
0.24 |
0.23 |
0.22 |
|
2.5 |
2.02 |
1.56 |
1.32 |
1.10 |
0.93 |
0.78 |
0.64 |
0.55 |
0.49 |
0.45 |
0.42 |
0.39 |
0.37 |
0.35 |
|
4 |
3.25 |
2.52 |
2.13 |
1.78 |
1.50 |
1.26 |
1.03 |
0.89 |
0.80 |
0.73 |
0.67 |
0.63 |
0.59 |
0.56 |
|
6 |
4.86 |
3.77 |
3.18 |
2.66 |
2.25 |
1.88 |
1.54 |
1.33 |
1.19 |
1.09 |
1.01 |
0.94 |
0.89 |
0.84 |
|
10 |
8.19 |
6.34 |
5.36 |
4.49 |
3.79 |
3.17 |
2.59 |
2.24 |
2.01 |
1.83 |
1.70 |
1.59 |
1.50 |
1.42 |
|
16 |
12.99 |
10.06 |
8.50 |
7.11 |
6.01 |
5.03 |
4.11 |
3.56 |
3.18 |
2.90 |
2.69 |
2.52 |
2.37 |
2.25 |
|
25 |
20.6 |
15.9 |
13.5 |
11.3 |
9.5 |
8.0 |
6.5 |
5.6 |
5.0 |
4.6 |
4.3 |
4.0 |
3.8 |
3.6 |
|
35 |
28.5 |
22.1 |
18.7 |
15.6 |
13.2 |
11.1 |
9.0 |
7.8 |
7.0 |
6.4 |
5.9 |
5.5 |
5.2 |
4.9 |
|
50 |
38.6 |
29.9 |
25.3 |
21.2 |
17.9 |
15.0 |
12.2 |
10.6 |
9.5 |
8.6 |
8.0 |
7.5 |
7.1 |
6.7 |
|
70 |
55.9 |
43.3 |
36.6 |
30.6 |
25.9 |
21.6 |
17.7 |
15.3 |
13.7 |
12.5 |
11.6 |
10.8 |
10.2 |
9.7 |
|
95 |
77.5 |
60.0 |
50.7 |
42.4 |
35.9 |
30.0 |
24.5 |
21.2 |
19.0 |
17.3 |
16.0 |
15.0 |
14.1 |
13.4 |
|
120 |
97.9 |
75.8 |
64.1 |
53.6 |
45.3 |
37.9 |
31.0 |
26.8 |
24.0 |
21.9 |
20.3 |
19.0 |
17.9 |
17.0 |
|
150 |
120.3 |
93.1 |
78.7 |
65.9 |
55.7 |
46.6 |
38.0 |
32.9 |
29.5 |
26.9 |
24.9 |
23.3 |
22.0 |
20.8 |
|
185 |
150.8 |
116.8 |
98.8 |
82.6 |
69.8 |
58.4 |
47.7 |
41.3 |
36.9 |
33.7 |
31.2 |
29.2 |
27.5 |
26.1 |
|
240 |
198.3 |
153.6 |
129.8 |
108.6 |
91.8 |
76.8 |
62.7 |
54.3 |
48.6 |
44.3 |
41.0 |
38.4 |
36.2 |
34.3 |
|
300 |
248.7 |
192.6 |
162.8 |
136.2 |
115.1 |
96.3 |
78.6 |
68.1 |
60.9 |
55.6 |
51.5 |
48.2 |
45.4 |
43.1 |
|
400 |
329.3 |
255.1 |
215.6 |
180.4 |
152.5 |
127.6 |
104.1 |
90.2 |
80.7 |
73.6 |
68.2 |
63.8 |
60.1 |
57.0 |
|
500 |
401.0 |
310.6 |
262.5 |
219.6 |
185.6 |
155.3 |
126.8 |
109.8 |
98.2 |
89.7 |
83.0 |
77.7 |
73.2 |
69.5 |
