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Metallic Armor
Conductor Sizes

Neets Module 04-Introduction to Electrical Conductors, Wiring Techniques, and Schematic Reading
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1-24 braid. The metal is woven directly over the cable as the outer covering. The metal used in this braid is galvanized steel, bronze, copper, or aluminum. Wire-braid armor is mainly for shipboard use. STEEL TAPE.—A second type of metallic armor is steel tape. Steel tape covering (view B of figure 1-17) is wrapped around the cable and then covered with a serving of jute. There are two types of steel tape armor. The first is called interlocking armor. Interlocking armor is applied by wrapping the tape around the cable so that each turn is overlapped by the next and is locked in place. The second type is flat- band armor. Flat-band armor consists of two layers of steel tape. The first layer is wrapped around the cable but is not overlapped. The second layer is then wrapped around the cable covering the area that was not covered by the first layer. WIRE ARMOR.—Wire armor is a layer of wound metal wire wrapped around the cable. Wire armor is usually made of galvanized steel and can be used over a lead sheath (see view C of figure 1-17). It can be used with the sheath as a buried cable where moisture is a concern, or without the sheath (view D of figure 1-17) when used in buildings. Q34. What are the two types of metallic protection? Q35. What are the three types of lead-sheathed cables? Q36. What are the three examples of metallic armor cable that were discussed? COAXIAL CABLE Coaxial cable (figure 1-18) is defined as two concentric wires, cylindrical in shape, separated by a dielectric of some type. One wire is the center conductor and the other is the outer conductor. These conductors are covered by a protective jacket. The protective jacket is then covered by an outer protective armor. Figure 1-18.—Coaxial cable. Coaxial cables are used as transmission lines and are constructed to provide protection against outside signal interference. SUMMARY In this chapter you learned that conductors are the means for tying the various components of an electrical or electronic system together. Many factors determine the type of conductor to be used in a specific application. In order for you to compare the different types and sizes of conductors, we discussed the following factors: Unit Size—The unit size of a conductor is the mil-foot. A mil-foot is a circular conductor 1foot long with a diameter of 1 mil (0.001 inch, or one-thousandth of an inch).






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