TM 10-6640-233-10
c. The Electrical Distribution System (Figure 1-6) is 208-240 volts at 50-60 hertz. A power regulator (shielded and
grounded) is utilized to regulate the voltage requirements of both the primary and secondary electrical systems. The
primary electrical system provides power to the four air conditioning units, the 12 heating elements, the purging
fan/blowers, water pump, the air compressor and vacuum pump, and laboratory equipment requiring 220 volts. The
primary circuit panel is located on the roadside of the interior bulkhead dividing the utility and the main laboratory
compartments. The secondary electrical distribution system provides power for lighting and the laboratory equipment
requiring 110 volts ac. The secondary circuit panel is located in the aft compartment, on the curbside interior wall.
Instruments and gages deemed necessary for monitoring of service systems operating conditions are integral to the
secondary circuit panel (i.e., vacuum gage and pressure gage). A power entry receptacle is located on the forward
roadside exterior of the trailer. Located adjacent to the receptacle is a timer used to activate the environmental control
units when purging the laboratory of toxic fumes prior to entry. A cable reel assembly is provided on the undercarriage of
the trailer. The assembly contains the 100-foot cable required to interface with the 60 KW DED generator set. The
AOAP Mobile Laboratory has a 24-volt dc, emergency electrical system. Each of the van's three compartments contains
one 24-volt emergency lighting fixture capable of adequate illumination during emergencies. The batteries supplying the
24 volts required for the system, two 12-volt MS35000, are located in the cable reel box. A battery charger is also
provided to maintain battery charge while the laboratory is deployed. Laboratory equipment permanently affixed to
countertops or anchored in place is "hard wired" through switchboxes or motor starter-relay boxes mounted on the
curbside or roadside walls, as applicable. Wall outlets are provided at 3-foot intervals above the counter surfaces. All
outlets are "one-way" 110 volts ac. A microswitch is installed in each of the two trailer access door frames. Each
compartment is provided with an override switch to bypass the microswitch circuit for the door accessing it. Under
normal conditions, opening either van access door activates the blackout lamp(s) and deactivates the incandescent
and/or fluorescent lighting in the compartment serviced by that door. The power required by the computer and its
peripherals is filtered, shielded, and buffered. No additional power taps are available on the computer line other than
those required by the data system. The line runs from noise filter located in the primary switch panel directly to the
computer cabinet.
d. Lighting System. Lighting for the AOAP Mobile Laboratory is provided by 15 fluorescent ceiling light fixtures.
Thirteen are located in the laboratory compartment and two are in the mechanical room. Power for the laboratory
compartment lights is provided by circuit breaker main panel assembly.
(1) Blackout Lighting. The center lamp in each of the light fixtures is covered with a blue filter. When an access
door is opened, its door interlock switch is activated. This will turn off all white lights and leave energized all blue filtered
lights. When the access door is closed, the interlock switch is again activated, returning power to the white lights.
(2) Emergency Lighting. Emergency lighting is provided to the laboratory compartment by light fixtures and two
emergency light ballast boxes. When normal power is available, phase A power continually charges the battery device in
ballast box. The device in ballast box receives its charge from phase C power. When normal power is lost, power from
ballast box will be provided via the Forward Emergency Light Switch in the ON position. Power from ballast box will be
provided via the Rear Emergency Light Switch in the ON position.
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