TM 5-3895-374-24-1 Pre-Operational Check List 1-16 To  insure  proper  operation  of  the  motor  control center the items listed below should be checked BEFORE ENERGIZING THE MOTOR CONTROL CENTER. 1. Complete     maintenance          procedure     M-1 through  M-36  starting  on  p  14.  This  initial maintenance Is extremely important to detect any shipping damage or loose connections. The motor control center should not be energized until initial maintenance is complete. 2. Perform  insulation  test  on  the  motor  control center (maintenance procedure M-37, p 23). 3 .    If  the  motor  control  center  is  equipped  with ground     fault     protection,     this     should     be adjusted properly before energizing. 4. All blocks or other temporary holding means should     be     removed     from     the     electrical devices. 5. Current transformers should have the secondary     shunt     bar     removed.     Do     not operate     a     current     transformer with its secondary open circuited. 6. Manually exercise all switches, circuit breakers,  and  other  operating  mechanisms to  make  sure  that  they  are  properly  aligned and operate freely. 7. Electrically  exercise  all  electrically  operated switches, circuit breakers and other mechanisms (but not under load) to determine that the device operates properly. An auxiliary source of control power may be required. 8. Timers   should   be   checked   for   the   proper interval and contact operation. 9. Check    overload    selection    tables    against motor  full  load  current  to  insure  that  proper overload units have been installed. 10.  Make   certain   all   load   and   remote   control connections have been made and agree with wiring diagrams provided. 11.  Make certain that all ground connections are made properly. 12.  Install   covers   and   close   doors   and   make certain all are properly tightened. Energizing Equipment WARNING- Energizing a motor control center for the first time   is   potentially   dangerous.   Therefore,   only qualified personnel should energize the equipment  If  faults  caused  by  damage  or  poor installation  practices  have  not  been  detected  in the     checkout     procedure described, serious damage  and/or  personal  injury  can  result  when the power is turned on. 1-17 In order to minimize risk of damage and/or injury, there  should  be  no  load  on  the  motor  control center  when  it  is  energized  Turn  off  all  of  the downstream    loads,    including    those    such    as distribution  equipment  and  other  devices  which are  remote  from  the  motor  control  center  The equipment  should  be  energized  in  sequence  by starting   at   the   source   end   of   the   system   and working  towards  the  load  end  In  other  words, energize    the    main    devices,    then    the    feeder devices and then the branch-circuit devices With barriers  (if  applicable)  in  place  and  unit  doors closed  and  latched,  turn  the  devices  on  with  a firm  positive  motion.  Protection  devices  that  are not  quick-acting  should  not  be  "teased"  into  the closed    position.    After    all    disconnect    devices have been closed, loads such as lighting circuits, starters,  contactors,  heaters,  and  motors,  may be turned on. Padlock Provisions 1-18 The  disconnect  can  be  padlocked  in  the  OFF position with unit door open or closed with up to three padlocks The door can be opened with the disconnect padlocked but the disconnect cannot be    forced    closed    For    an    application    which requires  the  disconnect  to  be  padlocked  in  the ON  position,  a  blind  hole,  provided  in  the  upper part  of  the  pivot  housing,  con  be  drilled  through to allow insertion of the padlock. (page 3-129)