|
Rating Factors for different installation conditions:
a) For Variations in Ambient Air Temperature :
| Ambient Air Temperature (°C) |
25 |
30 |
35 |
40 |
45 |
50 |
| Rating Factor, |
1.14 |
1.10 |
1.05 |
1.00 |
0.95 |
0.88 |
b) For Variations in Ground Temperature:
| Ground Temperature (°C), |
15, |
20, |
25, |
30, |
35, |
40, |
45 |
| Rating Factor, |
1.12, |
1.08, |
1.04, |
1.00, |
0.96, |
0.91, |
0.86 |
c) For Variations in Depth of Laying (for cable laid directly
in the ground):
| Depth of Laying (cm), |
90, |
105, |
12, |
150, |
180&above |
| Rating Factor, |
1.00, |
0.99, |
0.98, |
0.96, |
0.95 |
d) For Variations in Thermal Resistivitty of Soil:
| Thermal Resistivity of Soil (°C
cm/watt) |
100, |
120, |
150, |
200, |
250, |
300 |
| Rating Factor |
1.20, |
1.11, |
1.00, |
0.89, |
0.80, |
0.73 |
Short circuit Current Rating (for 1 second) of XLPE Insulated Cables
with Aluminium Conductor:
| Nominal Area (mm²), |
25, |
35, |
50, |
70, |
95, |
120, |
150, |
185, |
240, |
300, |
400 |
| Short Circuit Rating (KA), |
2.35, |
3.29, |
4.70, |
6.58, |
8.93, |
11.30, |
14.10, |
17.40, |
22.60, |
28.20, |
37.60 |
| "midlite"
1.1 KV XLPE Insulated Powder Cables With Aluminium / Copper Conductor
Conforming IS:7098 Part-1/1988. Comparison Of Current Carrying
Capacities With That Of PVC Insulated Cables (For Cables Laid In Ground) |
| Nominal Area of
Conductor (Sq. mm) |
Aluminium Conductor AC Current
Rating (Amp) |
Copper Conductor ACCurrent Rating
(Amp) |
| Singlecore |
Multicore |
Singlecore |
Multicore |
| PVC |
XLPE |
PVC |
XLPE |
PVC |
XLPE |
PVC |
XLPE |
| 10 |
51 |
55 |
46 |
50 |
65 |
71 |
60 |
65 |
| 16 |
66 |
74 |
60 |
68 |
85 |
95 |
77 |
87 |
| 25 |
86 |
98 |
76 |
90 |
110 |
125 |
99 |
115 |
| 35 |
100 |
118 |
92 |
108 |
130 |
150 |
120 |
138 |
| 50 |
120 |
137 |
110 |
126 |
155 |
175 |
145 |
161 |
| 70 |
140 |
172 |
135 |
158 |
190 |
220 |
175 |
202 |
| 95 |
175 |
204 |
165 |
187 |
220 |
260 |
210 |
239 |
| 120 |
195 |
234 |
185 |
215 |
250 |
301 |
240 |
276 |
| 150 |
220 |
262 |
210 |
240 |
280 |
336 |
270 |
308 |
| 185 |
240 |
298 |
235 |
273 |
305 |
381 |
300 |
350 |
| 240 |
270 |
344 |
275 |
316 |
345 |
441 |
345 |
405 |
| 30 |
295 |
387 |
305 |
355 |
375 |
496 |
385 |
455 |
| 400 |
325 |
458 |
335 |
420 |
400 |
586 |
425 |
53 |
|
