TM 1-1500-204-23-5 (c) Substantial low resistance conductors   shall   be   used   to   ground   all   stationary   and portable  machines,  equipment,  or  other  devices  in  which static    charges    may    be    generated,    or    which,    require electrical circuits of a hazardous nature. (d)  Shop  machinery  shall  be  operated only by qualified personnel observing safe practices. (e)   Safety   devices,   such   as   guards, interlocks, automatic releases, and stops, shall always be kept in operating condition. (f)          Ensure     that     all     unauthorized personnel   are   clear   of   area   before   opening   valves   or energizing electrical circuits for starting machinery. (g)   Suitable   mechanical   guards,   such as    enclosures    or    barricades,    shall    be    permanently installed on all machinery not already equipped with such to eliminate danger of injury from moving parts. (h)    Machinery  shall  not  be  adjusted, repaired,  oiled,  or  cleaned  while  machine  is  in  operation or power is on. (i) Personnel operating machinery shall wear protective clothing as prescribed.  A protective face shield or goggles shall be worn when operating a grinder regardless  of  whether  grinder  is  equipped  with  attached shields. (j)      Jewelry   shall   not   be   worn   while performing any maintenance. (2)  Fire safety.  A constant vigilance shall be maintained  to  seek  out  fire  hazards.    Fire  hazards  are constantly  present  in  the  shop  where  sparks,  friction,  or careless   handling   can   cause   an   explosion   that   may destroy    equipment    or    buildings,    and    injure    or    kill personnel.        Refer    to    AR    385-10,    The    Army    Safety Program  and  the  Occupational  Safety  and  Health  Act  of 1971.        The    following    fire    safety    practices    shall    be observed: (a) NO SMOKING signs shall be placed in areas where smoking could create a fire hazard. (b)   Personnel   shall   be   trained   in   the use,    knowledge,    and    location    of    shop    fire    fighting equipment. (c)  Each  shop  shall  be  equipped  with fire   extinguishers   suited   for   type   of   fire   most   likely   to occur. (d)      Use   correct   fire   extinguisher   for class of fire as follows:  Class A fire (wood, paper, trash, etc). Use water or soda-acid fire extinguisher.    Class  B  fire  (oil,  paint,  fuel,  grease,  etc). Use bromotrifluoromethane or carbon dioxide fire extinguisher.    Class  C  fire  (electrical  equipment).    Use bromotrifluoromethane   or   carbon   dioxide fire extinguisher.     Class     D     fire     (combustible     metals) magnesium,  titanium,  zirconium,  sodium, lithium,  and  potassium.    Use  dry  powder type fire extinguisher. (e)     Oily     waste,     rags,     and     similar combustible  materials  shall  be  discarded  in  self-closing metal containers which shall be emptied daily. (f)   Flammable   materials   shall   not   be stored in the shop. (g) Use only approved cleaning solvents. d.    Shop  Tools  and  Materials.    Handling  tools  and materials   require   observance   of   the   following   common safety practices: (1)  Do  not  leave  tools  or  objects  in  elevated positions from which they can fall or be knocked off. (2)   Do   not   point   a   compressed   airstream toward any part of the body. (3)   All   unserviceable   tools   shall   be   plainly marked and removed from service. (4)  Electrical cables and air hoses to portable units shall be laid out so there is no danger of tripping. (5) Electrical tools shall be connected to a low resistance ground. (6)  Keep  bench  tops  covered  with  material hard  enough  to  prevent  chips  and  other  foreign  material from  becoming  imbedded.    Keep  bench  tops  clean  and free from chips and filings. 4-2     Change 2