Section 16(3)(f) in Tamil Nadu Electricity Regulatory Commission Tamil Nadu Electricity Distribution Code
(f)The disconnecting device / or devices shall be provided at each electrical interface, which shall be capable of effectively disconnecting the system of the Licensee and other consumers and grounding the respective system at the common boundary. These devices shall be identified and marked by the Licensee and respective consumer and shall be maintained in good condition at all times. Such disconnecting devices shall be provided with interlocks to prevent inadvertent switching operations by unauthorized persons.