MIL-S-4953C(USAF)
3.14.4 An electrical starting system, manual starting system, and a battery charging system with relays shall be provided. The electrical system shall be 24V. A commercial battery shall be provided. Fuses or circuit breakers shall be provided as required to protect the electrical system.
3.14.5 Electrical equipment.
3.14.5.1 Alternator. An alternator shall be provided to supply power to the heater, safety controls, motor, and accessories. The alternator shall be rated at 6 kilowatt (kw), 7.5 kilovolt amperes (kva), 220V, 60 cycle, single phase alternating current (AC). The 220V supply shall be center tapped to provide 110V across each winding conductor. The center tap shall be grounded to the frame of the spray outfit.
3.14.5.2 The alternator shall conform to Standard MG-1. The temperature rise of the alternator and wiring shall not exceed the safe limits for the class of insulation used and as recommended by the alternator manufacturer. Theoutput voltage and frequency of the alternator shall be within
±3 percent of the rated value at rated speed when the load is varied from minimum load to
125 percent full load.
3.14.5.3 Panels.
3.14.5.3.1 Control panel. All instruments, gages, and controls shall be mounted on a control panel and shall consist of at least a voltmeter, ammeter, exciter-field rheostat, voltage-regulator rheostat, voltage-regulator switch and two 110V receptacles.
3.14.5.3.2 Switch panel. The switch panel shall incorporate an electric source selector level, heater switch, pump switch, panel light, and a compound-temperature gage.
3.14.5.3.3 The panel wiring and wiring arrangement shall be in accordance with Pamphlet 70. Care shall be exercised in wiring the control panel and making connections to the accessories.
3.14.5.4 Attachment cable. A three conductor Number 8 gage or larger, type SO heavy-duty attachment cable complete with a standard three wire twist lock plug shall be provided. The cable shall not be less than 35 feet long. The ground conductor shall be grounded to the spray outfit.
3.14.5.5 Valves. An electrical solenoid valve which will close by depression of a trigger shall be provided in the return line to permit pressure to build up at the gun. With the solenoid valve closed, a relief valve on the gun shall permit compound to spray from the gun nozzle. The relief valve shall be set to open at 150 psi. A safety valve shall be provided in the system to limit the pressure to 200 psi in the event of a clogged nozzle or kinked lines.
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