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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. 1-16


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