TM 1-1500-204-23-4 j.    Conduits.    When   installing   conduits,   inspect using the following procedures: (1)  Ensure  the  conduit  is  installed  so  that strain and flexing of ferrules is relieved. (2)  Ensure  the  conduit  is  not  collapsed  or flattened from excessive bending. (3) Ensure that conduits are installed so that fluids    or    condensed    moisture    will    not    be    trapped. Suitable drain holes shall be provided at the low points, except  for  magneto  ground-cable  conduit  and  metallic flexible conduit. (4) Ensure that bonding clamps are installed in  such  a  manner  that  damage  to  the  conduit  cannot result. k.    Bonds.    A  bond  is  any  fixed  union  existing between  two  metallic  objects  that  results  in  electrical conductivity  between  them.    Such  union  results  from either  physical  contact  between  conductive  surfaces  of the   objects   or   from   the   addition   of   a   firm   electrical connection   between   them.      Inspect   for   the   following desirable features: NOTE Intermittent electrical contact between conducting surfaces, which    may    become    part    of    a ground   plane   or   a   current   path, shall     be     prevented     either     by bonding,     or     by     insulation,     if bonding is not necessary. · Metallic  conduits  shall  be  bonded to   the   aircraft   structure   at   each terminating  and  break  point.    The bonding  path  may  be  through  the equipment   at   which   the   conduit terminates. · Bond  connections  shall  be  secure and free from corrosion. · Bonding jumpers shall be installed in    such    a    manner    as    not    to interfere    in    any    way    with    the operation of movable components of the aircraft. · Self-tapping   screws   shall   not   be used  for  bonding  purposes.    Only standard  threaded  screws  or  bolts of appropriate size shall be used. · Exposed  conducting  frames  or  parts  of electrical  or  electronic  equipment  shall have a low resistance bond of less than 0.1  ohm  to  structure.    If  the  equipment design includes a ground terminal or pin which   is   internally   connected   to   such exposed parts, a ground wire connection to such a terminal will satisfy this requirement. · Bonding  jumpers  shall  be  kept  as  short and     direct     as     possible,     and     when practicable, shall not exceed 3 inches in length. · Bonds  shall  be  attached  directly  to  the basic     aircraft     structure     rather     than through  other  bonded  parts  insofar  as practical. · Bonds  shall  be  installed  to  ensure  that the   structures   of   military   aircraft   are electrically   stable   and   free   from   the hazards   of   lightning,   static   discharge, electrical shock, etc., and to provide for the   suppression   of   radio   interference resulting from these hazards. l.    Junctions.    Ensure  that  only  approved  devices, such  as  solderless  type  terminals,  terminal  blocks, connectors,  disconnect  splices,  permanent  splices, and    feed-through    bushings    are    used    for    cable junctions.  Inspect for the provisions outlined below: · Electrical   junctions   shall   be   protected from short circuits resulting from movement   of   personnel,   cargo,   shell cases,  clips,  and  other  loose  or  stored materials.    Protection  shall  be  provided by  covering,  installing  them  in  junction boxes,  or  by  locating  them  in  such  a manner  that  additional  protection  is  not required. · Exposed  junctions  and  busses  shall  be protected with insulating materials. Junctions    and    busses    located    within enclosed areas containing only electrical  and  electronic  equipment  are not considered exposed. · Electrical junctions shall be mechanically    and    electrically    secure. They shall not be subject to mechanical strain or used as a support for insulating materials,     except     for     insulation     on terminals. m.  Toggle Switches.  Inspect toggle switches using the following procedures: 3-7