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Chapter 8 is primarily about communications installations, and it stands by itself. Many of the requirements provided in Chapter 8 are very specific to communications equipment. When Chapter 8 does refer to earlier chapters of the NEC, it does so very selectively. The first seven chapters of the NEC do not apply in Chapter 8 unless Chapter 8 explicitly says so.
For example, Chapter 8 provides specific requirements for the incoming equipment from a communications utility. It also refers to Article 250 for a very limited requirement on grounding that relates to this type of equipment, but only the information specifically referenced from Article 250 applies, rather than the entire article.
Another example can be found in the other articles in Chapter 8 that deal with cable TV antennas and cabling and broadband applications. Most of them refer selectively to requirements in Articles 110 and 300 for installation of listed equipment, for installations in air-handling spaces and for some aspects of workmanship (“Mechanical Execution of Work”).
Chapter 9 consists of tables that are referenced elsewhere in the Code.
For example, Table 1 provides maximum raceway fill requirements and is referenced in several individual raceway articles. A general statement in Section 300.17 explains the need for such rules.
Other tables address topics such as conduit bending radii, properties of conductors and the voltage, current and energy limits of remote control and signaling and fire alarm circuits.
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