CALCULATION OF CURRENT RATING of XLPE CABLE

Calculation of current rating of  XLPE cable- cable used in distribution system- In distribution system rating of cable  has been  decided by cross-sectional   area. hence for use of current we have to asked for cable on its cross-sectional area. Hence for 11 kv line in distribution system following types of  the cable are used.-

72 mm2 xlpe cable = current rating= 93 amp

120 mm2 xlpe cable= current rating=156 amp            

185 mm2 xlpe cable= current rating=240 amp

240 mm2  xlpe cable= current rating=240*1.3=312 amp

300 mm2 xlpe cable= current rating=300*1.3=390 amp

Appox Current rating of cable from its cross sectional area rating can be calculated by by following formula- cross sectional area* 1.3

Hence formula would be- cross sectional area*1.3= current rating

Example- 120 mm2 XLPE CABLE current rating would be- 120*1.3=156 amp.

Difference between PVC cable and XLPE cable-PVC-Poly Vinyl Chloride & XLPE-Cross Link Poly Ethylene are 

the insulations used on the cables

PVC is thin insulation mainly used in LT side cables

XLPE is thick insulation used in HT cables

(OperatingTemp)(SC Temp) (MoistureRes)(Fire Res)

PVC 70 130 V.Good Excellent