The width of an operation aisle inside a prefabricated substation shall be adequate for
performing any operation or maintenance. The width of such an aisle shall be 800 mm or
greater. Doors of switchgear and controlgear inside the prefabricated substation shall either
close in the direction of the exit or rotate such that they shall not reduce the width of the aisle.
Doors in any open fixed position or mechanical drives protruding from the switchgear and
controlgear shall not reduce the width of the aisle to less than 500 mm.