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AC 43.13-1B CHG 1 9/27/01 b. Care should be taken to avoid sharp bends in wires that have been marked with the hot stamping process. 11-118. SLACK. Wiring should be installed with sufficient slack so that bundles and indi- vidual wires are not under tension. Wires con- nected to movable or shock-mounted equip- ment should have sufficient length to allow full travel without tension on the bundle. Wiring at terminal lugs or connectors should have sufficient slack to allow two retermina- tions without replacement of wires. This slack should be in addition to the drip loop and the allowance for movable equipment. Normally, wire groups or bundles should not exceed 1/2-inch deflection between support points, as shown in figure 11-9a. This measurement may be exceeded provided there is no possibility of the wire group or bundle touching a surface that may cause abrasion. Sufficient slack should be provided at each end to: 11-119. POWER FEEDERS. The power feeder wires should be routed so that they can be easily inspected or replaced. They must be given special protection to prevent potential chafing against other wiring, aircraft structure, or components. 11-120. RF CABLE. All wiring needs to be protected from damage. However, coaxial and triaxial cables are particularly vulnerable to certain types of damage. Personnel should ex- ercise care while handling or working around coaxial. Coaxial damage can occur when clamped too tightly, or when they are bent sharply (normally at or near connectors). Damage can also be incurred during unrelated maintenance actions around the coaxial cable. Coaxial can be severely damaged on the inside without any evidence of damage on the out- side. Coaxial cables with solid center con- ductors should not be used. Stranded center coaxial cables can be used as a direct replace- ment for solid center coaxial. 11-121. PRECAUTIONS. a. b. c. 11-118A. DRIP LOOP IN WIRE BUNDLE. A drip loop is an area where wire is dressed downward to a connector, terminal block, panel, or junction bo. In additional to the service termination and strain relief, a trap or drip loop shall be provided in the wiring to prevent fluid or condensate from running into the above devices. (see Figure 11-9b) Wires or groups of wires should enter a junction box or piece of equipment in an upward direction where practicable. Where wires must be routed downwards to a junction box or unit of electric equipment, the entry should be sealed or adequate slack should be provided to form a trap or drip loop to prevent liquid from running down the wires in the box or electric unit. Permit replacement of terminals. Prevent mechanical strain on wires. Permit shifting of equipment for main- tenance purposes. a. b. c. d. Never kink coaxial cable. Never drop anything on coaxial cable. Never step on coaxial cable. Never bend coaxial cable sharply. Page 11-52 Par 11-117 e. Never loop coaxial cable tighter than the allowable bend radius. f. Never pull on coaxial cable except in a straight line. g. Never use coaxial cable for a handle, lean on it, or hang things on it (or any other wire).PDF Image | AFS-640
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