4-2. INSTALLATION.  (cont) a. General. (cont) NOTE If  the  generator  set  cannot  be grounded using the following methods,  refer  to  FM20-31. b. Flightline Hardstand Ground Stud. (1) Position generator set within easy access of hardstand ground stud and set handbrake. (2)   Using   at   least   No.   6   AWG (American Wire Gauge) copper wire, cut length of wire to fit between grounding stud  on  generator  set  and  hardstand ground stud. (3)  Strip  1-1/2  inches  (38  mm) insulation, if any, from  one  end  of wire. Attach  to  grounding  stud. (4)  Strip  insulation  from  other end of wire. Crimp wire on mounting lug.  Attach  mounting  lug  to  hardstand ground stud. Tighten connections to ensure a good electrical bond. c. underground  Metallic  Water  Pipe. (1)  Uncover  metallic  water  pipe for at least 10 feet (3.05 m) to ensure that  sufficient  length  is  available between any insulated sections. joints    or NOTE If the distance between joints or sections is 10 feet (3.05 m), this method  is  unacceptable. insulated less  than grounding 4-3) inch from ARMY TM  5-6115-612-12 MARINE  CORPS  TM  6115-12/7 AIR  FORCE TO 35C2-3-471-1 NAVY AG-320B0-0MM-000 (2)   Attach   ground   rod (figure to ground cable by stripping 1 (25  mm)  of  insulation,  if  any, ground cable. Insert stripped end of cable in clamp enough to insure a good  electrical  bond. (3)   Place   ground   rod   with   at- tached ground cable along water pipe. Attach  ground  rod  securely  to  water pipe to ensure a good electrical bond. (4) Cover water pipe with dirt. (5) Position generator set within easy  access  of  grounding  facility  and set handbrake. (6) (American length  of stud on facility. (7) Using   at   least   No.   6   AWG Wire Gauge) copper wire to fit between generator  set  and Strip 1-1/2 inches wire, cut grounding grounding (38 mm) insulation. if anv, from  one  end  of wire. Attach  to  grounding  stud. (8)  Strip  insulation  from  other end of wire. Crimp wire on mounting lug.  Attach  mounting  lug  to  hardstand ground  stud. Tighten ensure a good electrical d. Driven Metal Rod. NOTE connection to bond. A  driven  metal  ground  rod  must have  a  minimum  diameter  of  5/8 inch  (16  mm)  if  solid,  or  3/4 inch (19 mm) if pipe. Rod must be driven to a minimum of 8 feet (2.45 m). 4-7