Section 7(2) in The Merchant Shipping (Cargo Ship Construction And Survey) Rules, 1974
(2)In every such ship the emergency source of electric power required under sub-rule (1), shall be capable of operating the following services simultaneously, for a consecutive period of not less than six hours; namely :-(a)the emergency lighting required under the Indian Merchant Shipping (Life Saving Appliances) Rules, 1956;(b)the emergency lighting system provided in the main machinery space, the space containing the ship's main electric generating plant, on the navigating bridge and in the chart room;(c)the general alarm, if electrically operated;(d)the ship's navigation lights, if solely electric; and(e)the day light signalling lamp, if it is operated' the ship's main source of electric power.
