TM 5-6115-275-14 NAVFAC P-8-615-14 TO :15C2-3-452-1 (4) Outdoor Installation. (a) Whenever   possible,   locate   the   generator set in an area free of dust and moisture.    Avoid  soft  or muddy ground.  If it is necessary to locate the unit on soft or muddy ground, arrange a foundation of planks or logs to   prevent   the   unit   from   settling   or   sinking.      The generator set should be operated from a position as level as possible at all times. (b) Requirements for providing adequate space for  operation,  maintenance  and  ventilation  (cooling)  are contained  in  paragraphs  1.,  2.,  and  3.    below.    For  the type    of    construction    and    fortification    necessary    for protection  of  personnel  and  equipment,  refer  to  Field Manual  5-13,  The  Engineer  Soldiers’  Handbook,  5-15 Field Fortification and 5-34 Engineer Field Data. 1. A minimum clearance of four feet (120 cm) from all sides of the unit to the wall should be maintained whether  the  inclosure  is  roofed  or  unroofed,  dug  in  or sandbagged. 2. The  height  of  the  sandbagged  or  dug  in inclosure  should  be  a  minimum  of  four  feet  (120  cm) above the top of the generator. 3. For roofed inclosure, sandbagged or dug in, a  minimum  clearance  of  four  feet  (120  cm)  should  be maintained  between  the  top  of  the  generator  and  the roof. WARNING Do  not  operate  the  generator  set  until the    ground    stud    terminal    has    been connected to a suitable ground. Electrical faults in the generator set, load lines,   or   load    equipment    can    cause death by electrocution from contact with an ungrounded system. NOTE Sandbagging  may  be  used  to  support overhead cover. (5) Grounding.      The  generator  set  must  be grounded  prior  to  operation.      The  ground  can  be,  in order   of   perference,   an   underground   metallic   water piping system, a driven rod, or  a  buried  metal  plate.    A ground rod must have a mimimum diameter of 5/ 8 inch (1.59 cm) if solid or 3/4 inch (1.91 cm) if pipe, and must be  driven  to  a  mimimum  depth  of  8  feet  (240  cm).      A ground  plate  must  have  a  mimimum  area  of  9  square feet  (0.81  M  )  and  be  buried  at  a  mimimum  depth  of  4 feet  (120  cm).      The  ground  lead  must  be  a  number 6AWG (American Wire Gage) copper wire and be bolted or clamped to the rod, plate, or piping system.  Connect the  other  end  of  the  ground  lead  to  the  ground  stud terminal. (6) Leveling.      Set   up   the   unit   as   level   as possible.      Keep   the   unit   as   level   as   possible   during operation. WARNING Do not install or change the load cables while   the   generator   set   is   operating. The voltage generated by this equipment can  cause  death.    When  installing  load terminals, care should be taken to avoid shorts    between    terminals.        Arrange leads  to  avoid  a  short  occurring  if  the cable is bumped or pulled.  Tie the leads in position  with  the  insulation  material  if necessary. (7) Load Connections. (a) Loosen  the  nuts  on  the  studs  on  the  load terminals, figure 4-4. Figure 4-4.  Load connections. 4-5