During the loading or unloading of explosives there shall be no naked lights or fires on board the ship, nor shall artificial lights be allowed at the open hatches or in the hold in which explosives are stowed or within the barricades referred to in regulation 5.10: Provided that-
(a) this regulation shall not prevent the use of a safety lamp of a construction approved by an inspector of explosives nor shall this regulation prevent the employment of an artificial light or ship’s signal lights which
in the opinion of the port captain are constructed and disposed in such a manner as to prevent any risk of fire or explosion; and
(b) this regulation shall not be held to apply to engine-room fires when the same have been previously carefully banked.
