Cable Substitutions in VS .NET

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TABLE 11-4 Cable Substitutions
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them for the purposes of control, signaling, and communications There are three types of optical ber cables: Nonconductive These cables contain no metallic members or other electrically conductive materials Conductive These are cables that contain non-current-carrying conductive members such as metallic strength members and metallic vapor barriers Composite Cables that contain both optical bers and currentcarrying electrical conductors are permitted to contain noncurrent-carrying conductive members such as metallic strength members and metallic vapor barriers Composite optical ber cables are classi ed as electrical cables in accordance with the type of electrical conductors contained therein Raceways With one exception, a raceway system designed for enclosing and routing only nonconductive optical cables must be of a type permitted in Chap 3 of the Code and installed in accordance with Chap 3 Cables are classi ed according to types The use of letters to designate the cables makes it easier to refer to them accurately and with a minimum of space For instance, Table 770-53 lists the types See Table 11-5 Cable Markings Cables marked nonconductive optical ber plenum (OFNP) and conductive optical ber plenum OFCP, can be used in ducts, plenums, and other space carrying for environmental air The cables must have adequate re-resistant and low
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TABLE 11-5 Cable Substitutions or Table 77053 of NEC Table 77053 Cable Substitutions Cable Type OFNP OFCP OFNR OFCR OFNG, OFN OFCG, OFC Permitted Substitutions None OFNP OFNP OFNP, OFCP, OFNR OFNP, OFNR OFNP, OFCP, OFNR, OFCR, OFNG, OFN
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CHAPTER ELEVEN
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smoke-producing characteristics Types OFNR and OFCR are designed for use in risers They are suitable for use in a vertical run in a shaft or from oor-to- oor, and are listed as having re-resistant characteristics capable of preventing the spread of fire from oor-to- oor Cables labeled OPNG and OFCG are cables that can be used for general purposes, with the exception of risers and plenums, and in situations where resistance to the spread of re is desired The OFN and OFC types of cables are suitable for general purpose use with the exception of risers, plenums, and other space that may be used for environmental air See Table 770-50 of the Code or Table 11-6 Section 770-52 of the Code deals exclusively with the installation of optical bers and electrical conductors Part (a) deals with conductors for electrical light and power circuits and class 1 circuits Optical bers may be used where the same composite cable for electrical light and power or class 1 circuits operating at 600 volts or less is used
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TABLE 11-6 Cable Markings or Table 770-50 of NEC Code Table 77050 Cable Markings Cable Marking OFNP OFCP OFNR OFCR OFNG OFCG OFN OFC Type Nonconductive optical ber plenum cable Conductive optical ber plenum cable Nonconductive optical ber riser cable Conductive optical ber riser cable Nonconductive optical ber general-purpose cable Conductive optical ber general-purpose cable Nonconductive optical ber general-purpose cable Conductive optical ber general-purpose cable Reference 77051(a) and 77053(a) 77051(a) and 77053(a) 77051(b) and 77053(b) 77051(b) and 77053(b) 77051(c) and 77053(c) 77051(c) and 77053(c) 77051(d) and 77053(c) 77051(d) and 77053(c)
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Twisted_Pair Cable Color Code This system has tip colors, ring colors, group colors, and binder colors The twisted-pair color code is used to identify the number of a pair within a cable For example, a pair in the orange-Yellow binder group that is Yellow-Green is pair 418 (O Y+Y O) The twisted-pair color code in our telephone network is shown in Table 11-1 Binders A binder is a plastic ribbon wrapped around 25 pairs of wire or 600 pairs of wire Binder codes are identifying groups of 25 or 600 The binder code is the same as the pair code, only the group colors and the pair colors are reversed (eg, white-blue becomes blue-white), so when the abbreviated colors are put together, they are easier to understand Binder codes are good for 600 pairs of wire After that, each group of 600 pairs gets an additional plastic binder Table 11-2 Large cable binders: Pair 1 to 600, surrounded by a white binder Pair 601 to 1200, surrounded by a red binder Pair 1201 to 1800, surrounded by a white binder Fiber-Optic Cables Fiber-optic cables are made from concentric layers of glass Each layer of glass has a slightly different index of refraction or density The center rod is called the core, and the outer layers are called the clad The core is a very thin strand of highly re ned cylindrical glass Approximately, 20 miles of a 0010-inch diameter core can be drawn from a 45-inch cube of glass A cable s glass core may have a diameter of 45 microns (00002 inch) or may be as large as 400 microns (0016 inch) The clad is fused directly to the core The naked eye cannot see the difference between the two materials However, the clad has a different optical density than core material Both core and clad may be made of glass or plastic materials of different densities, or core may be glass and the clad plastic Fiber optics work on the theory of re ection That re ection results at the interface between two materials of different densities For instance, in a metallic wave guide the radio frequency energy is re ected along the guide when one-half wavelength of energy is shorter than the width of the wave guide However, in ber optics, the energy is re ected down the glass wave guide when the angle of re ection remains smaller than a critical angle The critical angle is determined by the ratio of the densities of the core and clad materials See Figure 11-8
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