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Earth Continuity Relay
An Earth Continuity Relay is designed to provide earth continuity protection.
The method used is called pilot earth loop or earth continuity monitoring, where an additional core pilot cable is included with the power and earth cores in the trailing or reeling cables, which supply power to the machines.
The Relay monitors the return path resistance between pilot and earth of the cable.
The maximum allowable loop resistance is 45 ohms with underground mining operations. Higher resistance values may be used for long cable runs used in surface mining operations.