used as part of a cable, the identification sleeve should specify  which color is associated with each wire identification code.  Identification sleeves are normally used for identifying the  following types of wire or cable: unjacketed shielded wire,  thermocouple wire, coaxial cable, multiconductor cable,  and high temperature wire. In most cases, identification tape  can be used in place of sleeving. For sleeving exposed to  high temperatures (over 400 °F), materials, such as silicone  fiberglass, should be used. Polyolefin sleeving should be used  in areas where resistance to solvent and synthetic hydraulic  fluids is necessary. Sleeves may be secured in place with  cable ties or by heat shrinking. The identification sleeving  for various sizes of wire is shown in  Figure 9-128 . Interconnecting wire is used in point-to-point open harnesses,  normally in the interior or pressurized fuselage, with each  wire providing enough insulation to resist damage from  handling and service exposure. Electrical wiring is often  installed in aircraft without special enclosing means. This  practice is known as open wiring and offers the advantages  of ease of maintenance and reduced weight. Wires are often installed in bundles to create a more organized  installation. These wire bundles are often called wire  harnesses. Wire harnesses are often made in the factory or  insulators. Fracture of the insulation wall and penetration to  the conductor of these materials by the stamping dies have  occurred. Later in service, when these openings have been  wetted by various fluids or moisture, serious arcing and  surface tracking have damaged wire bundles. Identification sleeves can be used if the direct marking on  the wire is not possible.  [Figure 9-127] Flexible sleeving, either clear or opaque, is satisfactory for  general use. When color-coded or striped component wire is  Figure 9-128.  Recommended size of identification sleeving. Figure 9-127.  Alternate method of identifying wire bundles. Figure 9-125.  Spacing of printed identification marks (indirect  marking).  Figure 9-126.  Laser wire printer. Wire Installation and Routing Open Wiring Wire Groups and Bundles and Routing 24 22 20 18 16 14 12 10 8 6 4 2 1 0 00 000 0000 8 6 4 2 1 0 00 000 0000  Wire size Sleeving size AN #  AL #  No.  Nominal ID (inch)  12  11  10 9 8 7 6 4 2 0 $^{3}$/$_{8 }$inch $^{1}$/$_{2 }$inch $^{1}$/$_{2 }$inch $^{5}$/$_{8 }$inch $^{5}$/$_{8 }$inch $^{3}$/$_{4 }$inch $^{3}$/$_{4 }$inch 0.085 0.095 0.106 0.118 0.113 0.148 0.166 0.208 0.263 0.330 0.375 0.500 0.500 0.625 0.625 0.750 0.750 9-78 H215A20 H215A20 H215A20 3 inches 6 ft 6 ft 3 inches