130. Earthing of neutral points .-Where the voltage of an alternating current system exceeds 30 volts, the neutral or mid-point shall be earthed by connection to an earthing system in the manner prescribed in rule 115:
[Provided that when the system concerned is required for blasting and signalling purposes, the provisions of this rule shall not apply:] [Substituted by G.S.R. 253, dated 19.2.1981 (w.e.f. 7.3.1981). ][Provided further that in case of unearthed neutral system adequate protection shall be provided with the approval of the Inspector.] [ Inserted by G.S.R. 45, dated 1.1.1993 (w.e.f. 23.1.1993).]
