55.—(1) The main source of electrical power shall be capable of illuminating any part of the ship normally accessible to and used by the passengers or the crew.
(2) Emergency electrical lighting provided in accordance with these Regulations shall be arranged so that a fire or other casualty in spaces containing the emergency source of electrical power, the associated transforming equipment, if any, the emergency switchboard and the emergency lighting switchboard will not render inoperative the main electrical lighting system required by paragraph (1).
(3) Lighting fittings shall be arranged to prevent rises in temperature which would be injurious to the fitting or the electric wiring or which would result in a risk of fire.