Section 123(2) in The Indian Electricity Rules, 1956
(2)Every flexible cable intended for use with portable or transportable apparatus shall be connected to the system and to such apparatus by properly constructed connectors:[Provided that for high voltage machines a bolted type connector shall be used and the trailing cable shall be suitably anchored at the machine end.][Provided further that where there are space limitation for multiple on-board motors and equipment for transportable or portable machines, direct entry flexible cable with elastometric sealing rings, compression gland, packing gland or sealing box which does not alter the flame-proof property may be permitted if a cable entry can accept any sealing ring with same outside diameter but different internal dimension, the ring shall have a minimum uncompressed axial height of 20 mm for circular cables of diameter not greater than 20 mm and 25 mm for circular cables of diameter greater than 20 mm.] [ Inserted by G.S.R. 274, dated 10.7.2002 (w.e.f. 20.7.2002).]
