ARMY TM 9-6115-671-14 AIR FORCE TO 35C2-3-446-32 MARINE CORPS TM 09249A/09246A-14    2-21 TABLE 2-5.  OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) (continued) B-BEFORE D-DURING A-AFTER Interval Item No. B D A Item to be inspected Procedures Check for and have repaired or adjusted as necessary Equipment is not ready/ available if: __________ WARNING High voltage is produced when the generator set is in operation.  Never attempt to start the generator set unless it is properly grounded.   Failure to comply can cause injury or death to personnel. 24 Ground Rod Cable and Connection Inspect ground rod and cable for loose connections, breaks, damage, and corrosion. Visual inspection only. Cable is missing or damaged. SECTION III.  OPERATION UNDER USUAL CONDITIONS 2.7 GENERAL.    This section provides information and guidance for generator set operation under normal conditions.  Refer to FM 20-31. 2.8 GENERATOR SET INSTALLATION. 2.8.1 General. __________ WARNING Exhaust discharge contains deadly gases including carbon monoxide.  Do not operate generator set in an enclosed area unless exhaust discharge is properly vented outside.  Failure to comply can cause injury or death to personnel. a.     Ensure that installation site is as level as possible. b.    Provide adequate ventilation to prevent recirculation of hot air exhausted from generator set. c.     Refer to Figure 2-4 for base mounting measurements. 2.8.2 Outdoor Installation. a.     Make use of natural protective barriers. FIGURE 2-4.  BASE MOUNTING MEASUREMENTS