Current Carying Capacity

Print

Last Updated on Monday, 17 October 2011 10:06

RATING FACTORS OF XLPE / PVC / EPR INSULATED POWER CABLES
CONDITION OF CURRENT CARRYING CAPACITY
Maximum conductor temperatur XLPE / EPR °C 90
PVC °C 70
Base Temperature in air °C 30
in ground °C 30
Thermal resistivity of soil °Km/watt 1.0
Load Factor in air - 1.0
in ground - 0.7
Depth of laying, in ground m 0.7

CABLE ARRANGEMENT
( d : cable overall diameter)

Method of laying Ambient Temperature ( °C ) Lay out of cable
1 Multi core cables 3 Single core cables in 3 phase system
Flat formation Trefoil formation
Installation in air 30 Single group
Multiple group
Laying direct in ground 30 Single group
Multiple group