FIGURE 111.65-40 (f) (5) (11)-Typical elementary wiring diagram and arrangement plan of gravity davits and dual boat winch employing double-pole limit switches, clutch interlock switches, and main line emergency switches in accordance with Subpart 160.015, Subchapter Q.

MASTER SWITCH

Spring Return to OFF.

Required by Paragraph 160.015-3(1)•

TYPICAL FULL VOLTAGE MAGNETIC ALTERNATING-CURRENT MOTOR CONTROLLER

With min line emergency disconnect switch having horsepower rating not less than that of motor and with external operating handle.

Required by Sub-paragraph 160.015-3(k)(1), revised.

Right Hand Davit Arm. Required by Sub-paragraph 160.015-3(k)(2), revised.
POWER LIMIT SWITCH

Left Hand Davit Arm. Required by Sub-paragraph 160.015-3(k)(2), revised.

FIGURE 111.65–40(f) (5) (iii)-Typical elementary wiring diagram and arrangement plan of gravity davit and boat winch employing power limit switches and combined starter and main line emergency disconnect switches in accordance with Subpart 160.015, Subchapter Q.

(6) The motor shall be energized from the final source of emergency lighting and power.

§ 111.65-30 Special requirements for electric power-operated watertight door system.

(a) Application. The provisions of this section are applicable to electric power-operated watertight door systems required by Subpart 73.35 of Subchapter H (Passenger Vessels) of this chapter, except that only paragraph (g) of this section shall be applicable to installations contracted for prior to November 19, 1952.

(b) General requirements. The watertight door operating system shall comply with the specification requirements of Subpart 163.001 of Subchapter Q (Specifications) of this chapter.

(c) Power supply. The power supply to power operated watertight door systems shall comply with the requirements contained in this paragraph.

(1) The source of power for electric motor-driven door operators shall be the source of the emergency lighting and power system as required by Subpart 112.15 of this chapter.

(2) If the peak current resulting from the simultaneous starting of all doors is too great for the temporary or final source of supply, the control shall be so arranged that when the central master switch is put to "close" the doors will start to close serially at intervals of not more than 3 seconds, preference being given to the doors starting with those in the lowest part of the vessel. The total time for all doors to be closed shall not exceed 60 seconds.

(3) The power supply for hydraulically operated watertight door systems employing a hydraulic system common to more than one watertight door shall be an accumulator tank of sufficient capacity to open all doors twice and to close all doors three times and one or more motor-driven hydraulic pumps capable of being operated from the final source of the emergency lighting and power system.

(i) The motor-driven hydraulic pumps automatically shall maintain the accumulator tank pressure within the design limits, and shall be located and controlled from above the bulkhead deck.

(ii) The accumulator tank capacity required by subdivision (i) of this sub

paragraph shall be available when the accumulator tank pressure is at the automatic pump "cut-in" pressure.

(4) The source of power for hydraulically operated watertight door systems employing an independent hydraulic system for each door operator shall be as required by subparagraphs (1) and (2) of this paragraph.

(5) The power supply for other types of watertight door operators shall be as approved by the Commandant.

(d) Distribution. Distribution of electric power to the watertight door operators shall comply with the requirements covered in this paragraph.

(1) Distribution panelboards used in connection with watertight door systems shall be located above the bulkhead deck and shall be provided with means for locking to prevent unauthorized access to the switching devices or fuses.

(2) Feeders supplying several watertight door operators shall be located above the bulkhead deck.

(3) A separate branch circuit shall be provided for each watertight door operator.

(e) Overcurrent protection. Overcurrent devices employed in watertight door system feeders and branch circuits shall be arranged to isolate a fault with as little disruption of the system as possible. The relationship between loads and rating or setting of overcurrent devices shall conform to the requirements covered in this paragraph.

(1) The rating or setting of each feeder overcurrent device shall be not less than 200 percent of its maximum load.

(2) The rating or setting of a branch circuit overcurrent device shall be not more than 25 percent of that of the feeder overcurrent device.

(f) Cable. All cable used in connection with watertight door system feeder circuits or branch circuits shall be leaded and armored, impervious sheathed and armored, or mineral-insulated, metal sheathed.

(g) Existing vessels. (1) Existing arrangements, materials, and facilities previously approved but not meeting the applicable specifications or requirements set forth in paragraphs (b) through (f) of this section may be continued in service so long as they are maintained in good condition to the satisfaction of the Officer in Charge, Marine Inspection.

Minor repairs and minor alterations may be made to the same standards as the original installation provided that in no case will a greater departure from the standards of paragraphs (b) through (f) of this section be permitted than presently exist.

(2) All new installations or major replacements shall meet the applicable specifications or requirements for new vessels.

§ 111.65-35 Special requirements for fire screen door holding and release systems.

(a) Application. When an electric fire screen door holding and release system is installed in compliance with the requirements of Part 72 of Subchapter H (Passenger Vessels) of this chapter, the provisions of this section, with the exception of paragraph (e) of this section shall apply to all installations contracted for on or after November 19, 1952. Installations contracted for prior to November 19, 1952, shall meet the requirements of paragraph (e) of this section.

(b) Definitions. (1) The term "fire screen door" will be used in this section to designate any self-closing door required to comply with § 72.05-25 (b) of Subchapter H (Passenger Vessels) of this chapter.

(2) The term "fire screen holding device" will be used in this section to designate any device designed and installed for the purpose of holding open a fire screen door.

(3) The term "local control station" will be used in this section to designate any manually operated device installed adjacent to a fire screen door for the purpose of releasing the door so that the fire screen door self-closing mechanism may close the door.

(4) The term "central control station" will be used in this subpart to designate any manually operated device installed to release the fire screen doors from the wheelhouse or fire control room.

(c) General. (1) The fire screen door holding and release system requirements contained in this section presuppose that the fire screen doors will be held open by electromagnets, door release being effected by deenergizing the electromagnets.

(2) The Commandant may accept any other means for fire screen door holding and releasing not less effective than the

electromagnetic type covered by this subpart.

(d) General requirements. (1) The fire screen door holding and release system shall consist of an electromagnet for each fire screen door, a self-aligning armature plate on each door to be seized and held by the electromagnet when the fire screen door is fully open, a control switch located adjacent to the door to interrupt the supply potential to the electromagnet, and a central control located in the wheelhouse or fire control room to interrupt remotely potential to all holding magnets.

(2) The fire screen door holding circuit shall be arranged so that loss of potential from any cause will release the doors, except that momentary interruptions of the circuit that may result from the operation of automatic bus-transfer devices in connection with the emergency lighting and power system, will not release the doors.

(3) The central control station shall consist of an enclosed switch, circuit breaker, or magnetic contactor of ample rating to interrupt the connected load. The switching unit shall be externally operative and maintaining in both the "hold doors" and "release doors" positions.

(4) The local control station shall consist of an enclosed externally operative fused switch having a rating of not less than 10-T amperes, 125 volts, and may be either the momentary contact type or the maintaining contact type. A single door holding magnet shall be connected to the fuse end of this local control station. Where several doors are in close proximity to each other, a single local control station switch of ample rating may be used to release simultaneously these several doors.

(5) A door holding electromagnet shall be designed for a nominal pull of approximately 200 pounds. When the arrangement of the electrical supply involves transfer relays to transfer the supply from a normal to a temporary source, a door holding electromagnet shall be designed so that, with a pull on the armature of 110 pounds, the armature will be held in the sealed position for approximately 4 second after the circuit to the electromagnet is opened. The electromagnet shall be designed for continuous duty in an ambient temperature of 50 degrees C. with a temperature

rise by thermometer measurement of not more than 55 degrees C. for Class A insulation nor more than 75 degrees C. for Class B insulation. The electromagnet coil shall be vacuum impregnated and the magnet enclosure shall be either drip-proof or watertight.

(6) The source of power for the fire screen door holding and release system shall be the emergency lighting and power system as required by Subpart 112.15 of this subchapter.

(7) On large vessels where the closing of all fire screen doors simultaneously would seriously interfere with fire-fighting operations or with the evacuation of passengers, it is recommended that the fire screen door release system be subdivided into several circuits. The circuits shall be arranged so that it will be possible to isolate any compartment in which a fire is reported by a sufficient number of closed fire screen doors effectively to stop all draft to the fire area. An effective draft stop will entail closing:

(i) All fire screen doors in the area between the main vertical zone bulkheads immediately forward and aft of the fire area;

(ii) All fire screen doors in the main vertical zone bulkheads immediately forward and aft of the fire area; and,

(iii) All fire screen doors in the next adjacent main vertical zones, forward and aft of the fire area. The fire screen door tripping arrangement shall be specifically approved for each vessel.

(e) Existing vessels. Fire screen door holding and release systems on vessels contracted for prior to November 19, 1952, shall meet the requirements covered in this paragraph.

(1) Existing arrangements, materials, and facilities previously approved will be considered satisfactory so long as they are maintained in good condition to the satisfaction of the Officer in Charge, Marine Inspection. Minor repairs and minor alterations may be made to the same standard as the original installation.

(2) All new installations or major replacements shall meet the applicable specifications or requirements for new vessels.

graph (1) of this section, shall apply to all vessels contracted for on or after November 19, 1952. The provisions of paragraph (i) of this section, shall apply to all vessels contracted for prior to November 19, 1952.

(b) General. The provisions of this section supplement the requirements of Subpart 160.015 of Subchapter Q (Specifications), Part 33 of Subchapter D (Tank Vessels), Part 75 of Subchapter H (Passenger Vessels) and Part 94 of Subchapter I (Cargo and Miscellaneous Vessels) of this chapter.

construction

(c) General requirements. (1) Control and power circuit switches and motor controllers installed in conjunction with lifeboat winches shall be of types specifically approved for use with lifeboat winches.

(2) Switches and motor controllers shall be of a design not likely to be adversely affected by corrosion of the working parts. Particular attention shall be given to hinged parts of contactors and relays. Structural parts, such as the enclosing cases, if not constructed of corrosion-resistant materials, shall be given a durable corrosionresistant finish.

(3) Insulating materials shall be limited to those which exhibit the lowest relative water absorption and/or the least effect of such water absorption upon the dielectric properties consistent with the other necessary characteristics.

(4) Where gaskets are used to provide a water seal between parts of an assembly, the gasket shall be secured in place in such a manner as to prevent its falling out or becoming loose when the unit is disassembled.

(5) Holes in the walls of equipment housings for the purpose of providing means for the attachment of parts on the interior thereof, or for securing covers and the like, shall not penetrate the total thickness of the housing wall.

(6) Totally enclosed units shall be provided with a needle valve or with at least one hole closed by a 4 inch pipe plug for draining condensed moisture. The valve or hole shall be located at the bottom, or as near the bottom as practicable, of the enclosure in order that it may drain the enclosure satisfactorily.

(7) Main line emergency disconnect switches, when installed in a location accessible to passengers, shall be provided with means whereby the switch can be