To protect the line from over voltage

To ensure the line is not loaded beyond rated current

To protect the service line from short cir

To protect the inmates from shock

1.3 m

1.5 m

2.0 m

2.5 m

1.2 m

2.5 m

5.8 m

6.1 m

Not more than 1 M ohm

Not more than 2 M ohm

Not more than 3 M ohm

Not more than 4 M ohm