Electrical Engineering ⇒ Topic : Classification of cables
Low voltage (LT.) cables : operating- voltage upto 1 kV
High voltage (H.T.) cables : operating voltage upto 1.1. kV
Super tension (S.T.) cables : operating voltage upto 33 kV
Extra high tension (E.H.T.) cables : operating voltage upto 66 kV
Extra super voltage power cables : operating voltage beyond 132 kV.
Insulation resistance of a single core sheathed cable
Insulation resistance of a single core sheathed cable is given by
R = insulation resistance
p = resistivity of dielectric
r1 = conductor radius ; and
r2 = sheath radius.
The insulation resistance of a cable can be measured by the following two methods :
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