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9/8/98 AC 43.13-1B SECTION 8. WIRING INSTALLATION INSPECTION REQUIREMENTS 11-96. GENERAL. Wires and cables should be inspected for adequacy of support, protection, and general condition throughout. The desirable and undesirable features in air- craft wiring installations are listed below and indicate conditions that may or may not exist. Accordingly, aircraft wiring must be visually inspected for the following requirements: CAUTION: For personal safety, and to avoid the possibility of fire, turn off all electrical power prior to starting an inspection of the aircraft electrical system or performing maintenance. a. Wires and cables are supported by suitable clamps, grommets, or other devices at intervals of not more than 24 inches, except when contained in troughs, ducts, or conduits. The supporting devices should be of a suitable size and type, with the wires and cables held securely in place without damage to the insu- lation. b. Metal stand-offs must be used to maintain clearance between wires and struc- ture. Employing tape or tubing is not accept- able as an alternative to stand-offs for main- taining clearance. c. Phenolic blocks, plastic liners, or rubber grommets are installed in holes, bulk- heads, floors, or structural members where it is impossible to install off-angle clamps to maintain wiring separation. In such cases, ad- ditional protection in the form of plastic or in- sulating tape may be used. d. Wires and cables in junction boxes, panels, and bundles are properly supported and laced to provide proper grouping and routing. e. Clamp retaining screws are properly secured so that the movement of wires and ca- bles is restricted to the span between the points of support and not on soldered or mechanical connections at terminal posts or connectors. f. Wire and cables are properly supported and bound so that there is no interference with other wires, cables, and equipment. g. Wires and cables are adequately sup- ported to prevent excessive movement in areas of high vibration. h. Insulating tubing is secured by tying, tie straps or with clamps. i. Continuous lacing (spaced 6 inches apart) is not used, except in panels and junc- tion boxes where this practice is optional. When lacing is installed in this manner, out- side junction boxes should be removed and re- placed with individual loops. j. Do not use tapes (such as friction or plastic tape) which will dry out in service, pro- duce chemical reactions with wire or cable in- sulation, or absorb moisture. k. Insulating tubing must be kept at a minimum and must be used to protect wire and cable from abrasion, chafing, exposure to fluid, and other conditions which could affect the cable insulation. However; the use of in- sulating tubing for support of wires and cable in lieu of stand-offs is prohibited. l. Do not use moisture-absorbent material as “fill” for clamps or adapters. m. Ensure that wires and cables are not tied or fastened together in conduit or insulat- ing tubing. Par 11-96 Page 11-43PDF Image | AFS-640
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