TM 10-6640-215-13 1-13. FUNCTIONAL DESCRIPTION OF PETROLEUM LABORATORY SUPPORT SYSTEMS - continued. (2) POWER  PANEL  NO.    2.    This  panel  is  located  in  the  mechanical  room.    It  receives  an  input  of  208V, 60Hz, 3-phase power from MAIN POWER PANEL via circuit breaker A1CB2.  POWER PANEL NO.  2 houses 12  circuit  breakers.    There  are  six  20-amp  circuit  breakers,  one  of  which  supplies  110  V,  60Hz,  single-phase power to the water Chiller and four which supply 208V, 60Hz, 3-phase power to the four environmental control units  via  control  relays  located  in  the  explosion  proof  Distribution  Box  A13.    The  other  20-amp  circuit  breaker supplies 208V, 60Hz, 3-phase power to the air compressor. One 45-amp circuit breaker in the POWER PANEL NO.  2 supplies 208V, 60Hz, 3-phase power to the low pressure boiler and its pump.  The remaining five circuit breakers  are  15-amp  and  supply  1lOV,  60Hz,  single-phase  power  to  the  vacuum  pump,  the  water  pump,  the fume and gum bath exhaust blowers, convenience outlets, and the mechanical room lighting (3) Lighting System.  Lighting for the Petroleum 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 breakers AICB9, A1CB11, and AICB13 located in the MAIN POWER PANEL.  A1CB9 provides phase A power via rear and curbside door interlock switches S1, and rear and curbside light switches S9 and S12 to lights DS6, DS7, DS8 DS9, and DS10O.  A1CBll provides phase B power via door interlock switches S3 and light switches S10 and 13 to lights DS1, DS2, DS3, DS4 and DS5.  AICB13 provides phase C power via door interlock switch S4 and light switches S11 and 14 to lights DS11, DS12, and DS13.    Power  for  lighting  in  the  mechanical  room  is  phase  B  power  provided  by  circuit  breaker  A15CB10  via door interlock switch S1 and light switch S3 to lights DS14 and DS15. (a) 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. (b) Emergency  Lighting.    Emergency  lighting  is  provided  to  the  laboratory  compartment  by  light fixtures  DS7  and  DS13  and  two  emergency  light  ballast  boxes  A26  and  A27.    When  normal  power  is available, phase A power continually charges the battery device in ballast box A26.  The device in ballast box A27 receives its charge from phase C power.  When normal power is lost, power from ballast box A26  will  be  provided  to  DS7  via  the  Forward  Emergency  Light  Switch  S17  in  the  ON  position.    Power from  ballast  box  A27  will  be  provided  to  DS13  via  the  Rear  Emergency  Light  Switch  S18  in  the  ON position. b. Purge  System  (Refer  to  Figure  1-5  and  FO-1).    The  purge  system  is  used  to  exhaust  potentially  dangerous contaminated air from inside the Petroleum Laboratory.  The system consists of the following components: (1) A1K1 power control relay located in the MAIN POWER PANEL. (2) A3K1 time delay relay located in explosion proof Distribution Box A3. 1-23