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9/8/98 AC 43.13-1B 11-248. GENERAL. Conduit is manufac- tured in metallic and nonmetallic materials and in both rigid and flexible forms. Primar- ily, its purpose is for mechanical protection of cables or wires. Conduit should be inspected for: proper end fittings; absence of abrasion at the end fittings; proper clamping; distortion; adequate drain points which are free of dirt, grease, or other obstructions; and freedom from abrasion or damage due to moving ob- jects, such as aircraft control cables or shifting cargo. 11-249. SIZE OF CONDUIT. Conduit size should be selected for a specific wire bundle application to allow for ease in main- tenance, and possible future circuit expansion, by specifying the conduit inner diameter (I.D.) about 25 percent larger than the maximum di- ameter of the wire bundle. 11-250. CONDUIT FITTINGS. Wire is vulnerable to abrasion at conduit ends. Suit- able fittings should be affixed to conduit ends in such a manner that a smooth surface comes in contact with the wire. When fittings are not used, the end of the conduit should be flared to prevent wire insulation damage. Conduit should be supported by use of clamps along the conduit run. 11-251. CONDUIT INSTALLATION. Conduit problems can be avoided by follow- ing these guidelines: a. Do not locate conduit where passen- gers or maintenance personnel might use it as a handhold or footstep. b. Provide drainholes at the lowest point in a conduit run. Drilling burrs should be care- fully removed. c. Support conduit to prevent chafing against structure and to avoid stressing its end fittings. 11-252. RIGID CONDUIT. Conduit sec- tions that have been damaged should be re- paired to preclude injury to the wires or wire bundle which may consume as much as 80 percent of the tube area. Minimum accept- able tube bend radii for rigid conduit are shown in table 11-23. Kinked or wrinkled bends in rigid conduits are not recommended and should be replaced. Tubing bends that have been flattened into an ellipse and the mi- nor diameter is less than 75 percent of the nominal tubing diameter should be replaced because the tube area will have been reduced by at least 10 percent. Tubing that has been formed and cut to final length should be de- burred to prevent wire insulation damage. When installing replacement tube sections with fittings at both ends, care should be taken to eliminate mechanical strain. TABLE 11-23. Bend radii for rigid conduit. SECTION 18. CONDUITS Nominal Tube O.D. (inches) Minimum Bend Radii (inches) 1/8 3/16 1/4 3/8 1/2 5/8 3/4 1 1 1/4 1 1/2 1 3/4 2 3/8 7/16 9/16 15/16 1 1/4 1 1/2 1 3/4 3 3 3/4 5 7 8 Par 11-248 Page 11-101PDF Image | AFS-640
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