15 (1) Where a water curtain system is supplied from an automatic sprinkler system pump, the discharge pipe to the open head curtain sprinklers from the main supply line shall be installed closer to the pump than the dry valves or zone valves governing the automatic system.

(2) Where a manual sprinkler system is supplied from an automatic sprinkler system pump, the discharge pipe to the open head sprinklers from the main supply line shall be installed closer to the pump than the dry valves or zone valves governing the automatic system.

(4) In every Class B ship over 22.9 m in length carrying more than 12 passengers, at least one of the power fire pumps shall be fitted with an automatic control whereby full pressure will be maintained on the fire mains at all times while passengers are on board excepting that where piping is liable to frost damage such piping may be maintained in a drained condition provided the shut-off valve and drainage cocks are located in a readily accessible location with a pressure gauge being installed on the drainable section of the piping immediately adjacent to the shut-off valve.

If both open and closed pushbuttons are fitted one above the other, the top button shall always be the open control.

If pushbuttons or other remote control devices are provided for operation of doors then each pushbutton or device shall contrast with its surroundings and shall be operable by a force not greater than 15 Newtons.

If several buttons are used to adjust the beam, the button which gives the greatest downward inclination must be installed to the left or below the button(s) for other dipped-beam positions.