Earth tester

Ohm meter

Megger

Wheatstone bridge

For easy Identification

To Avoid transfer of heat from power cable to control cable

To avoid leakage

To avoid short circuit

Open circuit

Short circuit

Earth fault

Earth leakage

10 M Ohm

100 M Ohm

10 k Ohm

1 M Ohm

Open circuit

Earth leakage

High value series resistance fault

Short circuit