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9/27/01 AC 43.13-1B CHG 1 SECTION 14. TERMINAL REPAIRS 11-174. GENERAL. Terminals are attached to the ends of electrical wires to facilitate con nection of the wires to terminal strips or items of equipment. The tensile strength of the wire to-terminal joint should be at least equivalent to the tensile strength of the wire itself, and its resistance negligible relative to the normal re sistance of the wire. a. Selection of Wire Terminals. The following should be considered in the selection of wire terminals. (1) Current rating. (2) Wire size (gauge) and insulation diameter. (3) Conductor material compatibility. (4) Stud size. (5) Insulation material compatibility. (6) Application environment. (7) Solder/solderless. Pre-insulated crimp-type ring-tongue terminals are preferred. The strength, size, and support ing means of studs and binding posts, as well as the wire size, should be considered when determining the number of terminals to be at tached to any one post. In high-temperature applications, the terminal temperature rating must be greater than the ambient temperature plus current related temperature rise. Use of nickel-plated terminals and of uninsulated ter minals with high-temperature insulating sleeves should be considered. Terminal blocks should be provided with adequate electrical clearance or insulation strips between mount ing hardware and conductive parts. b. Terminal Strips. Wires are usually joined at terminal strips. A terminal strip fit ted with barriers should be used to prevent the terminals on adjacent studs from contacting each other. Studs should be anchored against rotation. When more than four terminals are to be connected together, a small metal bus should be mounted across two or more adja cent studs. In all cases, the current should be carried by the terminal contact surfaces and not by the stud itself. Defective studs should be replaced with studs of the same size and mate rial since terminal strip studs of the smaller sizes may shear due to overtightening the nut. The replacement stud should be securely mounted in the terminal strip and the terminal securing nut should be tight. Terminal strips should be mounted in such a manner that loose metallic objects cannot fall across the termi nals or studs. It is good practice to provide at least one spare stud for future circuit expan sion or in case a stud is broken. Terminal strips that provide connection of radio and electronic systems to the aircraft electrical system should be inspected for loose connections, metallic objects that may have fallen across the termi nal strip, dirt and grease accumulation, etc. These type conditions can cause arcing which may result in a fire, or system failures. c. Terminal Lugs. Wire terminal lugs should be used to connect wiring to terminal block studs or equipment terminal studs. No more than four terminal lugs or three terminal lugs and a bus bar should be connected to any one stud. Total number of terminal lugs per stud includes a common bus bar joining adja cent studs. Four terminal lugs plus a common bus bar thus are not permitted on one stud. Terminal lugs should be selected with a stud hole diameter that matches the diameter of the stud. However, when the terminal lugs at tached to a stud vary in diameter, the greatest Par 11-174 Page 11-67PDF Image | AFS-640
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