The person designated to operate an electrically driven coal-cutter, or other portable or transportable machine, shall not leave the machine while it is in operation and shall, before leaving the area in which such machine is operating, ensure that the supply is disconnected from the flexible cable which supplies electricity to the machine and when any such machine is in operation, steps shall be taken to ensure that the flexible cable is not dragged along by the machine:
Provided that all portable and transportable machines used in underground mines shall operate on remote control from the concerned switchgear with pilot core protection:
Provided further that the portable and transportable machines used in open cast mines shall have the provision such that the power supply to the machine from concerned switchgear is remotely controlled from the machine:
Provided also that the portable or transportable machines used in open cast mine, provision of tripping device or switch device from the operator‟s cabin shall be provided to disconnect power supply to such machine from the field switchgear.