7.4 Control handless shall be provided at each side of the bulkhead at
　a minimum height of 1.6 m above the floor and shall be so arranged at to
　enable persons passing through the doorway to hold both handles in the
　open position without being able to set the power closing mechanism in
　operation accidentally. The direction of movement of the handles in
　opening and closing the door shall be in the direction of door movement
　and shall be clearly indicated.
　　　7.5 As far as practicable, electrical equipment and components for
　watertight doors shall be situated above the bulkhead deck and outside
　hazardous areas and spaces.
　　　7.6 The enclosures of electrical components necessarily situated below
　the bulkhead deck shall provide suitable protection against the ingress of
　water.*
　　　[* Reference is made to the following IEC publication 529: 1976:
　　　　　.1 electrical motors, associated circuits and control components;
　protected to IP x 7 standard;
　　　　　.2 door position indicators and associated circuit components;
　protected to IP x 8 standard; and
　　　　　.3 door movement warning signals; protected to IP x 6 standard.
　　　Other arrangements for the enclosures of electrical components may be
　fitted provided the Administration is satisfied that an equivalent
　protection is achieved. The water pressure testing of the enclosures
　protected to IP x 8 shall be based on the pressure that may occur at the
　location of the component during flooding for a period of 36 hours.]
　　　7.7 Electric power, control, indication and alarm circuits shall be
　protected against fault in such a way that a failure in one door circuit
　will not cause a failure in any other door circuit. Short circuits or
　other faults in the alarm or indicator circuits of a door shall not result
　in a loss of power operation of that door. Arrangements shall be such that
　leakage of water into the electrical equipment located below the bulkhead
　deck will not cause the door to open.
　　　7.8 A single electrical failure in the power operating or control
　system of a power-operated sliding watertight door shall not result in a
　closed door opening. Availability of the power supply should be
　continuously monitored at a point in the electrical circuit as near as
　practicable to each of the motors required by paragraph 7.3. Loss of any
　such power supply should activate an audible and visual alarm at the
　central operating console at the navigating bridge.　
　
　　　8.1 The central operating console at the navigating bridge shall have
　a "master mode" switch with two modes of control: a "local control" mode
　which shall allow any door to be locally opened and locally closed after
　use without automatic closure, and a "doors closed" mode which shall