Section 10(1)(ix) in Bihar Electricity Regulatory Commission (Standards of Performance of Distribution Licensee) Regulations, 2006
(ix)The earth wires and earth electrodes provided in the Distribution System shall be maintained in good condition to ensure instantaneous operation of the protective equipment, either a fuse or a circuit breaker as the case may be, in case of accidental snapping of a conductor. In case of failure in the operation of the protective system during any accidental snapping of conductors, the circuit shall be de-energised manually, immediately after it comes to the notice of the concerned employee of the Distribution Licensee. A detailed investigation shall be done to determine cause for non-operation of the protective systems and remedial measures should be taken promptly by the Licensee.