TM  5-6115-332-14 P-8-614-14 TO 35C2-3-424-1 unit for operation as described in the subparagraphs that follow: (2) Site Selection. Consider the following factors when selecting and preparing an installation site for the generator set. (a)   Distance    to    Load.   To    re- duce  transmission  line  voltage  losses, position the generator set as close as is reasonably possible to the load. (b)   Shelter. Even   though   the generator set is weather resistant, it should be located in an adequate shelter that will protect it from inclement weather. Provide a shelter that will protect it from inclement weather. Provide a shelter that is ventilated to allow heated air and exhaust fumes to escape. Depending  upon  the  ambient temperature range and upon whether the installation is to be temporary, semi- permanent, or  permanent,  provide facilities to maintain a reasonable temperature    in the area around the unit. If the unit is used in a closed building or other closed shelter, pipe the exhaust gases to the outside. When a spark arrester is required the installation procedure will be on the instruction sheet furnished with the spark arrester kit located on page 25, TM  5-6115-332-24P. The United States Forestry Service requires that any en- gine driven equipment opera- ting within National Forests or Parks be provided with spark  arresters  for  the ance of forest fires. avoid- Do not operate the generator set in an enclosed building unless the exhaust gases are piped to the outside. Exhaust gases contain carbon monoxide, a poisonous, odorless, color- less gas. ^4-2Change 1 (c) Access. Provide  enough clearance around the generator set to facilitate operation and maintenance activities. (d)   Fuel   Supply. Provide    a adequate supply of clean fuel to meet requirements based on operation time. Consider installation of the tanks underground if the installation will be longer that temporary. Locate the tanks as near the shelter as practicable and be certain that the bottoms of the tanks are not lower than four feet (120 cm) from the fuel pump on the installed generator set. Connect the fuel line from the external source to the fuel selector  valve. Provide for the exclu- sion of dirt and moisture. ( e )     S u p p o r t . Be  certain  that the bearing surface used can support the weight of the generator set. (f)   Foundation.   Since  the  unit is of the portable type, no foundation should normally be required. However, position the unit on reasonable firm, dry ground using planks, timbers, or a suitable gravel base, as available conditions  warrant. Provide  for  water drainage away from the unit. ( g )    M o u n t i n g . P o s i t i o n    t h e unit so that it is level in both planes and so that the frame is supported on its  entire  bottom  surface. If neces- sary,    the frame may be secured to a suitable base. ( 3 )  Electrical   Connections. All internal electrical connections for proper operation of the generator sets have been made at the time of manufac- ture. If it appears that changes have been made in the wiring, refer the matter to Direct Support Maintenance. (a)  Power   Transmission   Cables. Use cable with a minimum wire size of No.    8 AWG. This size will give a voltage drop of about 1 volt per 25 feet (750 cm) of cable when the unit is operated at full load. If the distance to the load is great, increase the wire size to No. 6 to No. 4 to minimize voltage drop.