Section 72(3) in The Delhi Metro Airport Express Line, General Rules, 2010
(3)No person shall work on high voltage equipment, or switch such equipment by local control unless he is properly trained and certified to perform such duties by the Authorised Officer and possesses a valid certificate of competency and he shall also obtain the permission of the traction power controller before undertaking such work and the procedure for obtaining; granting and canceling of such permission shall be laid down in special instructions.
