TM 10-5410-2’21-10 Section III.  CONTROLS AND UTILITY CONNECTIONS 2-9.  General This   section   describes   the   various   controls   and   utility connections   and   provides   the   operator/crew   sufficient information  to  ensure  connection  and  operation  of  the expandable shelter. 2-10.  Power Input Panel The  power  input  panel  is  recessed  on  the  lower  outside of  the  front,  center  section  wall.    The  power  input  panel provides  power  inlet  receptacles  for  120/208  volts,  400 Hz;   120/240   volts,   60   Hz   power,   air-lock   light,   hose heater,  remote  temperature  sensor,  telephone  jack  and drain hose heater (fig. 2-7). a. 120/208 Volts, 400 Hz Power Inlet Receptacle. (1) The  inlet  receptacle  is  a  five  pin  snap  lock receptacle with a hinged protective cover. (2) The inlet receptacle provides for connection of  a  source  of  120/208  volts,  400  Hz  electrical  power  to the shelter electrical system. b 120/240 Volts, 60 Hz Power Inlet Receptacle. (1) The  inlet  receptacle  is  a  five  pin  snap  lock receptacle with a hinged protective cover. (2) The inlet receptacle provides for connection of a source of 120/240 volts, 60 Hz electrical power to the shelter electrical system. c. Air-lock   Light   Receptacle.      The   air-lock   light receptacle    provides    a    source    of    120    volt,    400    Hz electrical    power    for    connection    of    the    air-lock    light assembly. d. Hose    Heater    Receptacle.        The    hose    heater receptacle  provides  a  source  of  120/208  volts,  400  Hz electrical power for connection of the hose heater. e Remote  Temperature  Sensor  Receptacle.    The remote    temperature    sensor    receptacle    provides    for connection   of   condition   air   source   thermostat   to   the remote temperature sensor. f. Telephone Jack.  The telephone jack provides a connection for an external telephone input line. g. Drain Hose Heater  Receptacle.    The  drain  hose heater  receptacle  provides  a  source  of  120/  208  volts, 400 Hz electrical power for connection of the drain hose heater. 2-11.    Power  Output  Panel  The  power  output  panel  is mounted on the rear, center section wall, adjacent to the shelter  access  door.    The  power  output  panel  provides output   receptacles   for   120/208   volts,   400   Hz   power; 120/240 volts, 60 Hz power, air-lock light, and emergency surgery light power supply inlet (fig.2-8). a. 120/208 Volts, 400 Hz Power Output Receptacle. (1) The  output  power  receptacle  is  a  five  pin snap lock receptacle with a hinged protective cover. (2) The   outlet   power   receptacle   provides   for connection  of  another  shelter  to  the  120/208  volts,  400 Hz electrical circuit. b. 120/240 Volts, 60 Hz Power Output Receptacle. (1) The   outlet   power   receptacle   is   a   five   pin snap lock receptacle with a hinged protective cover. (2) The   output   power   receptacle   provides   for connection of another shelter to the 120/240 volts, 60 Hz electrical circuit. c. Air-lock   Light   Receptacle.      The   air-lock   light receptacle   provides   a    source    of    120    volts,    400    Hz electrical  power  for  alternate  connection  of  the  air-lock light assembly. d. Emergency   Surgery   Light   Power   Supply   Inlet Receptacle.    The  emergency  surgery  light  power  supply inlet receptacle provides a connection for an emergency light power supply. 2-12.  Power Distribution Panel a. Power Distribution Panel.  The power distribution panel  is  located  above  the  access  door  on  the  inside  of the  rear,  center  section  wall.    The  panel  contained  all circuit   breakers   for   shelter   Electrical   systems,   with   a tinged door for access. Three toggle switches are provided to operate the 28 volt dc  ceiling  mounted  surgery  lights  and  emergency  light when  used.    The  left  end  of  the  power  panel  includes  a means     for     attaching     and     electrically     connecting     a humidistat from  the  humidifier  system,  when  used.    The right   end   of   the   power   panel   includes   a   means   for attaching  and  electrically  connecting  a  thermostat  from the    temperature    control    system,    when    used.        Two connectors are provided for supplying 120/208 volts, 400 Hz   power   for   sterilize   cabinets,   when   used;   and   one connector  for  supplying  120/240  volts,  60  Hz  power  for an X-ray machine, when used (fig. 2-9). b. Circuit Breaker Panel.  The circuit breaker panel provides  protection  for  shelter  electrical  circuits.    Circuit breakers    are    push-pull    type,    which,    when    overload occurs   circuit   breakers   will   pop   to   the   open   position. Circuit breakers may be reset by pressing in to close the circuit after overload 2-40