Medium Voltage Power Cables Catalogue - AEC Online
Medium Voltage Power Cables Catalogue - AEC Online
Medium Voltage Power Cables Catalogue - AEC Online
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Annex E: Derating Factors<br />
Table E.1<br />
Derating factors for ambient ground temperature<br />
Max. Conductor<br />
temperature<br />
Ambient ground temperature ºC<br />
ºC<br />
20<br />
25<br />
30<br />
35<br />
40<br />
45<br />
50<br />
90 ºC<br />
1.09<br />
1.04<br />
1.00<br />
0.95<br />
0.90<br />
0.85<br />
0.80<br />
Table E.2<br />
Derating factors for ambient air temperature<br />
Max. Conductor<br />
temperature<br />
Ambient air temperature ºC<br />
ºC<br />
25<br />
30<br />
35<br />
40<br />
45<br />
50<br />
55<br />
90 ºC<br />
1.14<br />
1.10<br />
1.05<br />
1.00<br />
0.95<br />
0.89<br />
0.84<br />
Table E.3<br />
Derating factors for depths of laying for direct buried cables<br />
Depth of laying<br />
mt.<br />
Single-core cables<br />
Nominal conductor size<br />
Three-core cables<br />
0.50<br />
0.60<br />
0.80<br />
1.00<br />
1.25<br />
1.50<br />
1.75<br />
2.00<br />
2.50<br />
3.00<br />
≤ 185 mm 2 > 185 mm 2 1.04<br />
1.04<br />
1.02<br />
1.00<br />
0.98<br />
0.96<br />
0.95<br />
0.94<br />
0.93<br />
0.91<br />
0.90<br />
1.06<br />
1.04<br />
1.00<br />
0.97<br />
0.95<br />
0.93<br />
0.91<br />
0.90<br />
0.88<br />
0.86<br />
1.03<br />
1.00<br />
0.98<br />
0.96<br />
0.95<br />
0.94<br />
0.93<br />
0.91<br />
0.90<br />
145
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