USA: +1-585-535-1023

UK: +44-208-133-5697

AUS: +61-280-07-5697

Classification of cables

  1. Low voltage (L.T.) cables …. operating voltage upto 1 kV
  2. High voltage (H.T.) cables …. operating voltage upto 1.1. kV
  3. Super tension (S.T.) cables …. operating voltage upto 33 kV
  4. Extra high tension (E.H.T.l cables …. operating voltage upto 66 kV
  5. 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 :

2

where R = insulation resistance,

ρ= resistivity of dielectric,

r1 = conductor radius, and

r2 = sheath radius.

The insulation resistance of a cable can be measured by the following two methods:

1.Galvanometer method

2.By meggar.