TM 5-3895-374-24-1 INSTALLATION Location I-1 Motor   control   centers   are   not   designed   to   be placed  in  hazardous  locations.    The  area  chosen should    be     well     ventilated,     free     from     excess humidity,  dust  and  dirt.    The  temperature  of  the area  should  be  no  less  than  0°C  (32°F)  and  no greater  than  40°C  (104°F).    For  indoor  locations, protection   from   moisture   or   water   entering   the enclosure must be provided. Motor control centers should be located in an area which allows a minimum of three feet of free space in    front    of    front-of-board    construction.        An additional three feet should be allowed in the rear if the  sections  are  back-to-back  construction.    This free space will give adequate room to remove and install  units.    A  minimum  of  1/2"  (13  mm)  space should  be  provided  between  the  back  of  front-of- board  motor  control  centers  and  a  wall  (6"  (  152 mm) for damp locations). When  selecting  a  location  for  the  installation  of  a motor  control  center,  careful  attention  should  be given  to  accessibility,  overhead  clearances,  and future expansions.  Consideration of these factors will eliminate many difficulties during the installation of this and future motor control centers. Motor control centers are assembled in the factory on   a   smooth   level   surface   to   insure   that   all sections  are  properly  aligned.    A  similar  smooth and   level   surface   should   be   provided   by   the customer  for  installation.    An  uneven  foundation may cause misalignment of shipping blocks, units and  doors.    The  surface  under  a  motor  control center   must   be   of   a   non-combustible   material unless bottom plates are installed in each vertical section. Section Preparation for Splicing WARNING:  There  is  a  hazard  of  electrical  shock or  burn  whenever  working  in  or  around  electrical equipment Turn off power supplying this equipment before working on it. I-2 Before    positioning    the    motor    control    center sections,    check    for    damaged    bus    bars    and insulators   If   the   bus   is   bent   or   insulators   are broken,  do  not  install  the  motor  control  center. Report any damage to the carrier. To  mount  and  splice  a  new  motor  control  center section  to  an  existing  section,  or  to  loin  factory shipping splits, the following steps must be taken. When   sections   do   not   require   splicing,   skip   to installation Procedure I-6, page 6. NOTE;   The   splice   bar   feature   is   designed   for assembly   from   the   front   of   the   motor   control center.  It is not necessary to remove back plates or  top  plates  Back-plates  on  20"  (508  mm)  deep sections    may    be    removed    to    bolt    structures together.    No  attempt  should  be  made  to  remove the  riveted  back  plate  of  a  15"  (381  mm)  deep section. I-3 Remove  the  topmost  blank  space  cover  or  unit from   Section   R   Also   remove   the   unit   door   on Section R to avoid open door obstruction. NOTE   Units   are   held   in   place   with   mounting screws   located   in   the   back   of   the   unit   Control station   plates   holding   the   pushbuttons,   selector switches,  pilot  lights  and  reset  buttons  must  be removed from the unit door before removal of the unit is attempted. (page 3-122)