TM 1-1500-204-23-4 Figure 3-3.  Hand Wire Marking Machine Table 3-2.  Recommended Sizes of Marking Type Height of letters Wire size (Inches) No.  26 and No.  22 1/16 No.  20 thru No.  14 5/64 No.  12 thru No.  0000 and 7/64 Coaxial Cable (2) Ensure terminal blocks are securely mounted. (3) Ensure    terminal    connections    to    terminal block studs, and nuts on unused studs, are tight. (4) Ensure evidence of overheating and corrosion is not present on connections to terminal block studs. (5) Ensure the number of terminal connections to a terminal block stud does not exceed four. (6) Inspect  for  physical  damage  to  studs,  stud threads,  and  terminal  blocks.    Replace  cracked  terminal strips and those studs with stripped threads. h. Fuses  and  Fuse  Holders.    When  installing  fuses and fuse holders, inspect using the following procedures: (1) Inspect  for  security  of  connections  to  fuse holders. (2) Inspect  for  the  presence  of  corrosion  and evidence   of   overheating   on   fuses   and   fuse   holders. Replace   corroded   fuses   and   clean   fuse   holders.      If evidence of overheating is found, check for correct rating of fuse. (3) Inspect   for   security   of   mounting   of   fuse holder. (4) Inspect   for   replenishment   of   spare   fuses used  in  flight.    Replace  with  fuses  of  appropriate  current rating only. (5) Inspect   for   exposed   fuses   susceptible   to shorting.      Install   cover   of   non-conducting   material   if required. i. Splices.    When  installing  crimp  type  connectors, inspect splices using the following procedures: (1) Check    for    the    presence    of    snug-fitting transparent  insulating  tubing  extending  at  least  1/2  inch over  each  end  and  tied  in  place  with  waxed  cord  unless the   connector   is   of   the   pre-insulated   type.      Use   of transparent  tape  is  approved,  but  only  as  a  temporary means, to be replaced as soon as possible. (2) Check     for     the     spacing     of     splices     at staggered  intervals  to  prevent  excessive  enlargement  of the bundle.  Groups of non-staggered splices need not be replaced;   however,   it   may   be   necessary   to   use   extra damps to support the added localized weight. NOTE · Splices  may  be  used  within  12 inches  of  a  termination  device when    attached    to    the    pigtail spare lead of a potted termination  device,  or  to  splice multiple  wires  to  a  single  wire, or  to  adjust  the  wire  sizes  so that   they   are   compatible   with the contact crimp barrel sizes. · The  application  of  splices  shall be design control and be authorized    by    the    applicable technical    manual    or    ATCOM engineering. Change 3 3-6