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SPOT TYING

When cable supports are used in equipment as shown in figure 2-48, spot ties are used to secure the conductor groups if the supports are more than 12 inches apart. The spot ties are made by wrapping the cord around the group as shown in figure 2-49. To finish the tie, use a clove hitch followed by a square knot with an extra loop. The free ends of the cord are then trimmed to a minimum of 3/8 inch.

Figure 2-48. - Use of spot ties.

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Figure 2-49. - Making spot ties.

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SELF-CLINCHING CABLE STRAPS

Self-clinching cable straps are adjustable, lightweight, flat nylon straps. They have molded ribs or serrations on the inside surface to grip the wire. They may be used instead of individual cord ties for securing wire groups or bundles quickly. The straps are of two types: a plain cable strap and one that has a flat surface for identifying the cables.

Do not use nylon cable straps over wire bundles containing coaxial cable. Do not use straps in areas where failure of the strap would allow the strap to fall into movable parts.

Installing self-clinching cable straps is done with a Military Standard hand tool, as shown in figure 2-50. An illustration of the working parts of the tool is shown in figure 2-51. To use the tool, follow the manufacturer's instructions.

Figure 2-50. - Installing self-clinching cable straps.

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Figure 2-51. - Military Standard hand tool for self-clinching cable straps.

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Use proper tools and make sure the strap is cut flush with the eye of the strap. This prevents painful cuts and scratches caused by protruding strap ends. Do not use plastic cable straps in high-temperature areas (above 250F).

HIGH-TEMPERATURE PRESSURE-SENSITIVE TAPE LACING

High-temperature, pressure-sensitive tape must be used to tie wire bundles in areas where the temperature may exceed 250F. Install the tape as follows (figure 2-52):

  • Wrap the tape around the wire bundle three times, with a two-thirds overlap for each turn.
  • Heat-seal the loose tape end with the side of a soldering iron tip.

Figure 2-52. - Securing wire bundles in high-temperature areas.

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Insulation tape (including the glass fiber type) is highly flammable and should not be used in a high-temperature environment. Only insulation tape approved for high-temperature operation (suitable for continuous operation at 500F) should be used in high-temperature environments.

Q.54 When are spot ties used? answer.gif (214 bytes)
Q.55 What is used to install self-clinching cable straps? answer.gif (214 bytes)
Q.56 What is used to tie wire bundles in high-temperature areas? answer.gif (214 bytes)




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