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Chapter 8 Communications Systems | 810.15 | Masts and metal structures supporting antennas shall be grounded or bonded in accordance with 810.21, unless the antenna and its related supporting mast or structure are within a zone of protection defined by a 46 m (150 ft) radius rolling sphere. Informational Note: See NFPA 780-2020, Standard for the Installation of Lightning Protection Systems, 4.7.3.1, for the application of the term rolling sphere. [810.15](https://2023.antflix.net#810.15) | https://2023.antflix.net#810.15 |
Chapter 8 Communications Systems | 810.16(A) | Outdoor antenna conductors for receiving stations shall be of a size not less than given in Table 810.16(A).Table 810.16 (A) Size of Receiving Station Outdoor Antenna Conductors Material Minimum Size of Conductors (AWG)Where Maximum Open Span Length Is Less Than11 m (35 ft) 11 m to45 m (35 ftto 150 ft) Over 45 m(150 ft) Aluminum alloy, hard-drawn copper 19 14 12 Copper-clad steel, bronze, or other high-strength material 20 17 14 [810.16(A)](https://2023.antflix.net#810.16(A)) | https://2023.antflix.net#810.16(A) |
Chapter 8 Communications Systems | 810.16(B) | Outdoor antennas, such as vertical rods and flat, parabolic, or dipole structures, shall be of corrosion-resistant materials and of strength suitable to withstand ice and wind loading conditions and shall be located well away from overhead conductors of electric light and power circuits of over 150 volts to ground, so as to avoid the possibility of the antenna or structure falling into or making accidental contact with such circuits. [810.16(B)](https://2023.antflix.net#810.16(B)) | https://2023.antflix.net#810.16(B) |
Chapter 8 Communications Systems | 810.17 | Lead-in conductors from outside antennas for receiving stations shall, for various maximum open span lengths, be of such size as to have a tensile strength at least as great as that of the conductors for antennas as specified in 810.16. If the lead-in consists of two or more conductors that are twisted together, are enclosed in the same covering, or are concentric, the conductor size shall, for various maximum open span lengths, be such that the tensile strength of the combination is at least as great as that of the conductors for antennas as specified in 810.16. [810.17](https://2023.antflix.net#810.17) | https://2023.antflix.net#810.17 |
Chapter 8 Communications Systems | 810.18(A) | Lead-in conductors attached to buildings shall be installed so that they cannot swing closer than 600 mm (2 ft) to the conductors of circuits of 250 volts or less between conductors, or 3.0 m (10 ft) to the conductors of circuits of over 250 volts between conductors, except that in the case of circuits not over 150 volts between conductors, if all conductors involved are supported so as to ensure permanent separation, the clearance shall be permitted to be reduced but shall not be less than 100 mm (4 in.). The clearance between lead-in conductors and any conductor forming a part of a lightning protection system shall not be less than 1.8 m (6 ft). Underground conductors shall be separated at least 300 mm (12 in.) from conductors of any light or power circuits or Class 1 circuits. Exception: The separation and clearance requirements shall not apply if the electric light or power conductors, Class 1 conductors, or lead-in conductors are installed in raceways or metal cable armor. Informational Note No. 1: See 250.60 for grounding associated with lightning protection components - strike termination devices. See NFPA 780-2020, Standard for the Installation of Lightning Protection Systems, for detailed information on grounding, bonding, and spacing from lightning protection systems, and the calculation of specific separation distances using the sideflash equation in Section 4.6. Informational Note No. 2: See NFPA 780-2020, Standard for the Installation of Lighting Protection Systems, for information on bonding or separation of metal raceways, enclosures, frames, and other non-current-carrying metal parts of electrical equipment installed on a building equipped with a lightning protection system. Separation from lightning protection conductors is typically 1.8 m (6 ft) through air or 900 mm (3 ft) through dense materials such as concrete, brick, or wood. [810.18(A)](https://2023.antflix.net#810.18(A)) | https://2023.antflix.net#810.18(A) |
Chapter 8 Communications Systems | 810.18(B) | Indoor antennas and indoor lead-ins shall not be run nearer than 50 mm (2 in.) to conductors of other wiring systems in the premises unless one of the following conditions applies: The other conductors are in metal raceways or cable armor.The indoor antennas and indoor lead-ins are permanently separated from such other conductors by a continuous firmly fixed nonconductor. [810.18(B)](https://2023.antflix.net#810.18(B)) | https://2023.antflix.net#810.18(B) |
Chapter 8 Communications Systems | 810.18(C) | Indoor antennas and indoor lead-ins shall be permitted to occupy the same box or enclosure with conductors of other wiring systems if separated from such other conductors by an effective permanently installed barrier. [810.18(C)](https://2023.antflix.net#810.18(C)) | https://2023.antflix.net#810.18(C) |
Chapter 8 Communications Systems | 810.19 | If an electrical supply circuit is used in lieu of an antenna, the device by which the radio receiving set is connected to the supply circuit shall be listed. [810.19](https://2023.antflix.net#810.19) | https://2023.antflix.net#810.19 |
Chapter 8 Communications Systems | 810.20(A) | Each lead-in conductor from an outdoor antenna shall be provided with a listed antenna discharge unit. Exception: A separate antenna discharge unit is not required if the lead-in conductors are enclosed in a continuous metal shield that complies with one of the following: (1) Is grounded or bonded with a conductor in accordance with 810.21 (2) Is protected by an antenna discharge unit [810.20(A)](https://2023.antflix.net#810.20(A)) | https://2023.antflix.net#810.20(A) |
Chapter 8 Communications Systems | 810.20(B) | Antenna discharge units shall be located outside the building or inside the building between the point of entrance of the lead-in and the radio set or transformers and as near as practicable to the entrance of the conductors to the building. The antenna discharge unit shall not be located near combustible material or in a hazardous (classified) location as defined in accordance with 500.5 and 505.5. [810.20(B)](https://2023.antflix.net#810.20(B)) | https://2023.antflix.net#810.20(B) |
Chapter 8 Communications Systems | 810.20(C) | The antenna discharge unit shall be grounded or bonded in accordance with 810.21. [810.20(C)](https://2023.antflix.net#810.20(C)) | https://2023.antflix.net#810.20(C) |
Chapter 8 Communications Systems | 810.21 | Bonding conductors and grounding electrode conductors shall comply with 810.21(A) through 810.21 (K). [810.21](https://2023.antflix.net#810.21) | https://2023.antflix.net#810.21 |
Chapter 8 Communications Systems | 810.21(A) | The bonding conductor or grounding electrode conductor shall be of copper, aluminum, copper-clad steel, copper-clad aluminum, bronze, or similar corrosion-resistant material. Aluminum or copper-clad aluminum bonding conductors or grounding electrode conductors shall not be used if subject to corrosive conditions or in direct contact with masonry or the earth or where subject to corrosive conditions. If used outside, aluminum or copper-clad aluminum conductors shall not be installed within 450 mm (18 in.) of the earth. [810.21(A)](https://2023.antflix.net#810.21(A)) | https://2023.antflix.net#810.21(A) |
Chapter 8 Communications Systems | 810.21(B) | Insulation on bonding conductors or grounding electrode conductors shall not be required. [810.21(B)](https://2023.antflix.net#810.21(B)) | https://2023.antflix.net#810.21(B) |
Chapter 8 Communications Systems | 810.21(C) | The bonding conductor or grounding electrode conductor shall be securely fastened in place and shall be permitted to be directly attached to the surface wired over without the use of insulating supports. Exception: Where proper support cannot be provided, the size of the bonding conductors or grounding electrode conductors shall be increased proportionately. [810.21(C)](https://2023.antflix.net#810.21(C)) | https://2023.antflix.net#810.21(C) |
Chapter 8 Communications Systems | 810.21(D) | Bonding conductors and grounding electrode conductors shall be protected where exposed to physical damage. Where the bonding conductor or grounding electrode conductor is installed in a metal raceway, both ends of the raceway shall be bonded to the contained conductor or to the same terminal or electrode to which the bonding conductor or grounding electrode conductor is connected. [810.21(D)](https://2023.antflix.net#810.21(D)) | https://2023.antflix.net#810.21(D) |
Chapter 8 Communications Systems | 810.21(E) | The bonding conductor or grounding electrode conductor for an antenna mast or antenna discharge unit shall be run in as straight a line as practicable. [810.21(E)](https://2023.antflix.net#810.21(E)) | https://2023.antflix.net#810.21(E) |
Chapter 8 Communications Systems | 810.21(F) | The bonding conductor or grounding electrode conductor shall be connected as required in 810.21(F)(1) through 810.21(F)(3). [810.21(F)](https://2023.antflix.net#810.21(F)) | https://2023.antflix.net#810.21(F) |
Chapter 8 Communications Systems | 810.21(F)(1) | If the building or structure served has an inter-system bonding termination as required by 250.94, the bonding conductor shall be connected to the intersystem bonding termination. [810.21(F)(1)](https://2023.antflix.net#810.21(F)(1)) | https://2023.antflix.net#810.21(F)(1) |
Chapter 8 Communications Systems | 810.21(F)(2) | If the building or structure served has no intersystem bonding termination, the bonding conductor or grounding electrode conductor shall be connected to the nearest accessible location on one of the following: The building or structure grounding electrode system as covered in 250.50The power service accessible means external to the building, as covered in 250.94The nonflexible metal power service racewayThe service equipment enclosureThe grounding electrode conductor or the grounding electrode conductor metal enclosures of the power serviceThe grounded interior metal water piping systems, within 1.52 m (5 ft) from its point of entrance to the building, as covered in 250.52A bonding device intended to provide a termination point for the bonding conductor (intersystem bonding) shall not interfere with the opening of an equipment enclosure. A bonding device shall be mounted on nonremovable parts. A bonding device shall not be mounted on a door or cover even if the door or cover is nonremovable. [810.21(F)(2)](https://2023.antflix.net#810.21(F)(2)) | https://2023.antflix.net#810.21(F)(2) |
Chapter 8 Communications Systems | 810.21(F)(3) | If the building or structure served has no intersystem bonding termination or grounding means as described in 810.21(F)(2), the grounding electrode conductor shall be connected to a grounding electrode as described in 250.52. [810.21(F)(3)](https://2023.antflix.net#810.21(F)(3)) | https://2023.antflix.net#810.21(F)(3) |
Chapter 8 Communications Systems | 810.21(G) | The bonding conductor or grounding electrode conductor shall be permitted to be run either inside or outside the building. [810.21(G)](https://2023.antflix.net#810.21(G)) | https://2023.antflix.net#810.21(G) |
Chapter 8 Communications Systems | 810.21(H) | The bonding conductor or grounding electrode conductor shall not be smaller than 10 AWG copper, 8 AWG aluminum, or 17 AWG copper-clad steel or bronze. [810.21(H)](https://2023.antflix.net#810.21(H)) | https://2023.antflix.net#810.21(H) |
Chapter 8 Communications Systems | 810.21(I) | A single bonding conductor or grounding electrode conductor shall be permitted for both protective and operating purposes. [810.21(I)](https://2023.antflix.net#810.21(I)) | https://2023.antflix.net#810.21(I) |
Chapter 8 Communications Systems | 810.21(J) | A bonding jumper not smaller than 6 AWG copper or equivalent shall be connected between the radio and television equipment grounding electrode and the power grounding electrode system at the building or structure served if separate electrodes are used. [810.21(J)](https://2023.antflix.net#810.21(J)) | https://2023.antflix.net#810.21(J) |
Chapter 8 Communications Systems | 810.21(K) | Connections to grounding electrodes shall comply with 250.70. [810.21(K)](https://2023.antflix.net#810.21(K)) | https://2023.antflix.net#810.21(K) |
Chapter 8 Communications Systems | 810.51 | In addition to complying with Part III, antenna systems for amateur and citizen band transmitting and receiving stations shall also comply with 810.11 through 810.15. [810.51](https://2023.antflix.net#810.51) | https://2023.antflix.net#810.51 |
Chapter 8 Communications Systems | 810.52 | Antenna conductors for transmitting and receiving stations shall be of a size not less than given in Table 810.52. Table 810.52 Size of Outdoor Antenna Conductors Material Minimum Size of Conductors (AWG)If Maximum Open Span Length Is Less Than 45 m(150 ft) Over 45 m(150 ft) Hard-drawn copper 14 10 Copper-clad steel, bronze, or other high-strength material 14 12 [810.52](https://2023.antflix.net#810.52) | https://2023.antflix.net#810.52 |
Chapter 8 Communications Systems | 810.53 | Lead-in conductors for transmitting stations shall, for various maximum span lengths, be of a size at least as great as that of conductors for antennas as specified in 810.52. [810.53](https://2023.antflix.net#810.53) | https://2023.antflix.net#810.53 |
Chapter 8 Communications Systems | 810.54 | Antenna conductors for transmitting stations, attached to buildings, shall be firmly mounted at least 75 mm (3 in.) clear of the surface of the building on nonabsorbent insulating supports, such as treated pins or brackets equipped with insulators having not less than 75-mm (3-in.) creepage and airgap distances. Lead-in conductors attached to buildings shall also comply with these requirements. Exception: If the lead-in conductors are enclosed in a continuous metal shield that is grounded with a conductor in accordance with 810.58, they shall not be required to comply with these requirements. If grounded, the metal shield shall also be permitted to be used as a conductor. [810.54](https://2023.antflix.net#810.54) | https://2023.antflix.net#810.54 |
Chapter 8 Communications Systems | 810.55 | Except where protected with a continuous metallic shield that is grounded with a conductor in accordance with 810.58, lead-in conductors for transmitting stations shall enter buildings by one of the following methods: Through a rigid, noncombustible, nonabsorbent insulating tube or bushingThrough an opening provided for the purpose in which the entrance conductors are firmly secured so as to provide a clearance of at least 50 mm (2 in.)Through a drilled window pane [810.55](https://2023.antflix.net#810.55) | https://2023.antflix.net#810.55 |
Chapter 8 Communications Systems | 810.56 | Lead-in conductors to radio transmitters shall be located or installed so as to make accidental contact with them difficult. [810.56](https://2023.antflix.net#810.56) | https://2023.antflix.net#810.56 |
Chapter 8 Communications Systems | 810.57 | Each lead-in conductor for outdoor antennas shall be provided with an antenna discharge unit or other suitable means that drain static charges from the antenna system. Exception No. 1: If the lead-in conductor is protected by a continuous metal shield that is grounded with a conductor in accordance with 810.58, an antenna discharge unit or other suitable means shall not be required for the lead-in conductor. Exception No. 2: If the antenna is grounded or bonded with a conductor in accordance with 810.58, an antenna discharge unit or other suitable means shall not be required. [810.57](https://2023.antflix.net#810.57) | https://2023.antflix.net#810.57 |
Chapter 8 Communications Systems | 810.58 | Bonding conductors and grounding electrode conductors shall comply with 810.58(A) through 810.58(C). [810.58](https://2023.antflix.net#810.58) | https://2023.antflix.net#810.58 |
Chapter 8 Communications Systems | 810.58(A) | All bonding conductors and grounding electrode conductors for amateur and citizen band transmitting and receiving stations shall comply with 810.21(A) through 810.21(C). [810.58(A)](https://2023.antflix.net#810.58(A)) | https://2023.antflix.net#810.58(A) |
Chapter 8 Communications Systems | 810.58(B) | The protective bonding conductor or grounding electrode conductor for transmitting stations shall be as large as the lead-in but not smaller than 10 AWG copper, bronze, or copper-clad steel. [810.58(B)](https://2023.antflix.net#810.58(B)) | https://2023.antflix.net#810.58(B) |
Chapter 8 Communications Systems | 810.58(C) | The operating bonding conductor or grounding electrode conductor for transmitting stations shall not be less than 14 AWG copper or its equivalent. [810.58(C)](https://2023.antflix.net#810.58(C)) | https://2023.antflix.net#810.58(C) |
Chapter 8 Communications Systems | 810.70 | All conductors inside the building shall be separated at least 100 mm (4 in.) from the conductors of any electric light, power, or signaling circuit unless one of the following conditions applies: The conductors of a permanent audio system are installed in compliance with Parts I and II of Article 640.The conductors of portable and temporary audio systems are installed in compliance with Parts I and III of Article 640.The conductors are separated from such other conductors by a continuous and firmly fixed nonconductor. [810.70](https://2023.antflix.net#810.70) | https://2023.antflix.net#810.70 |
Chapter 8 Communications Systems | 810.71 | Transmitters shall comply with 810.71(A) through (C). [810.71](https://2023.antflix.net#810.71) | https://2023.antflix.net#810.71 |
Chapter 8 Communications Systems | 810.71(A) | The transmitter shall be enclosed in a metal frame or grille or separated from the operating space by a barrier or other equivalent means, all metallic parts of which are effectively connected to a bonding conductor or grounding electrode conductor. [810.71(A)](https://2023.antflix.net#810.71(A)) | https://2023.antflix.net#810.71(A) |
Chapter 8 Communications Systems | 810.71(B) | All external metal handles and controls accessible to the operating personnel shall be effectively connected to an equipment grounding conductor if the transmitter is powered by the premises wiring system or grounded with a conductor in accordance with 810.21. [810.71(B)](https://2023.antflix.net#810.71(B)) | https://2023.antflix.net#810.71(B) |
Chapter 8 Communications Systems | 810.71(C) | All access doors shall be provided with interlocks that disconnect all voltages of over 350 volts between conductors when any access door is opened. [810.71(C)](https://2023.antflix.net#810.71(C)) | https://2023.antflix.net#810.71(C) |
Chapter 8 Communications Systems | 820.1 | This article covers coaxial cable distribution of radio frequency signals typically employed in community antenna television (CATV) systems. [820.1](https://2023.antflix.net#820.1) | https://2023.antflix.net#820.1 |
Chapter 8 Communications Systems | 820.3 | The wiring methods of Article 830 shall be permitted to substitute for the wiring methods of Article 820. Informational Note: Use of Article 830 wiring methods will facilitate the upgrading of Article 820 installations to network-powered broadband applications. [820.3](https://2023.antflix.net#820.3) | https://2023.antflix.net#820.3 |
Chapter 8 Communications Systems | 820.15 | Coaxial cable shall be permitted to deliver power to equipment that is directly associated with the radio frequency distribution system if the voltage is not over 60 volts and if the current is supplied by a transformer or other device that has power-limiting characteristics. Power shall be blocked from premises devices on the network that are not intended to be powered via the coaxial cable. [820.15](https://2023.antflix.net#820.15) | https://2023.antflix.net#820.15 |
Chapter 8 Communications Systems | 820.93 | Coaxial cables entering buildings or attached to buildings shall comply with 820.93(A) or (B). Where the outer conductive shield of a coaxial cable is grounded, no other protective devices shall be required. For purposes of this section, grounding located at mobile home service equipment located within 9.0 m (30 ft) of the exterior wall of the mobile home it serves, or at a mobile home disconnecting means grounded in accordance with 250.32 and located within 9.0 m (30 ft) of the exterior wall of the mobile home it serves, shall be considered to meet the requirements of this section. Informational Note: Selecting a grounding block location to achieve the shortest practicable bonding conductor or grounding electrode conductor helps limit potential differences between CATV and other metallic systems. [820.93](https://2023.antflix.net#820.93) | https://2023.antflix.net#820.93 |
Chapter 8 Communications Systems | 820.93(A) | In installations where the coaxial cable enters the building, the outer conductive shield shall be grounded in accordance with 820.100. The grounding shall be as close as practicable to the point of entrance. [820.93(A)](https://2023.antflix.net#820.93(A)) | https://2023.antflix.net#820.93(A) |
Chapter 8 Communications Systems | 820.93(B) | In installations where the coaxial cable is terminated outside of the building, the outer conductive shield shall be grounded in accordance with 820.100. The grounding shall be as close as practicable to the point of attachment or termination. [820.93(B)](https://2023.antflix.net#820.93(B)) | https://2023.antflix.net#820.93(B) |
Chapter 8 Communications Systems | 820.93(C) | Where installed, a listed primary protector shall be applied on each community antenna and radio distribution (CATV) cable external to the premises. The listed primary protector shall be located as close as practicable to the entrance point of the cable on either side or integral to the ground block. [820.93(C)](https://2023.antflix.net#820.93(C)) | https://2023.antflix.net#820.93(C) |
Chapter 8 Communications Systems | 820.93(D) | If a primary protector or equipment providing the primary protection function is used, it shall not be located in any hazardous (classified) location as defined in 500.5 and 505.5 or in the vicinity of easily ignitible material. Exception: Primary protection equipment shall be used only if permitted by 501.150, 502.150, and 503.150. [820.93(D)](https://2023.antflix.net#820.93(D)) | https://2023.antflix.net#820.93(D) |
Chapter 8 Communications Systems | 820.100 | The shield of the coaxial cable shall be bonded or grounded as specified in 820.100(A) and (B). Exception: For communications systems using coaxial cable completely contained within the building (i.e., they do not exit the building) or the exterior zone of protection defined by a 46 m (150 ft) radius rolling sphere and isolated from outside cable plant, the shield shall be permitted to be grounded by a connection to an equipment grounding conductor as described in 250.118. Connecting to an equipment grounding conductor through a grounded receptacle using a dedicated bonding jumper and a permanently connected listed device shall be permitted. Use of a cord and plug for the connection to an equipment grounding conductor shall not be permitted. Informational Note: See NFPA 780-2020, Standard for the Installation of Lightning Protection Systems, 4.7.3.1, for the application of the term rolling sphere. [820.100](https://2023.antflix.net#820.100) | https://2023.antflix.net#820.100 |
Chapter 8 Communications Systems | 820.100(A) | The installation shall be in accordance with 800.100. [820.100(A)](https://2023.antflix.net#820.100(A)) | https://2023.antflix.net#820.100(A) |
Chapter 8 Communications Systems | 820.100(B) | Grounding of a coaxial drop cable shield by means of a protective device that does not interrupt the grounding system within the premises shall be permitted. [820.100(B)](https://2023.antflix.net#820.100(B)) | https://2023.antflix.net#820.100(B) |
Chapter 8 Communications Systems | 820.103 | Unpowered equipment and enclosures or equipment powered by the coaxial cable shall be considered grounded where connected to the metallic cable shield. [820.103](https://2023.antflix.net#820.103) | https://2023.antflix.net#820.103 |
Chapter 8 Communications Systems | 820.154 | The substitutions for coaxial cables in Table 820.154 and illustrated in Figure 820.154 shall be permitted. Informational Note: The substitute cables in Table 820.154 and Figure 820.154 are only coaxial-type cables. Table 820.154 Coaxial Cable Uses and Permitted Substitutions Cable Type Permitted Substitutions CATVP CMP, BLP CATVR CATVP, CMP, CMR, BMR, BLP, BLR CATV CATVP, CMP, CATVR. CMR, CMG, CM, BMR, BM, BLP, BLR, BL CATVX CATVP, CMP, CATVR, CMR, CATV, CMG, CM, BMR, BM, BLP, BLR, BL, BLX FIGURE 820.154 Coaxial Cable Substitution Hierarchy. [820.154](https://2023.antflix.net#820.154) | https://2023.antflix.net#820.154 |
Chapter 8 Communications Systems | 830.1 | This article covers network-powered broadband communications systems that provide any combination of voice, audio, video, data, and interactive services through a network interface unit. Informational Note: A typical basic system configuration includes a cable supplying power and broadband signal to a network interface unit that converts the broadband signal to the component signals. Typical cables are coaxial cable with both broadband signal and power on the center conductor, composite metallic cable with a coaxial member(s) or twisted pair members for the broadband signal and twisted pair members for power, and hybrid optical fiber cable with a pair of conductors for power. Larger systems may also include network components such as amplifiers that require network power. [830.1](https://2023.antflix.net#830.1) | https://2023.antflix.net#830.1 |
Chapter 8 Communications Systems | 830.15 | Network-powered broadband communications systems shall be classified as having low- or medium-power sources as specified in the following: Sources shall be classified as defined in Table 830.15.Direct-current power sources exceeding 150 volts to ground, but no more than 200 volts to ground, with the current to ground limited to 10 mA dc, that meet the current and power limitation for medium-power sources in Table 830.15 shall be classified as medium-power sources.Informational Note: See UL 60950-21-2007, Standard for Safety for Information Technology Equipment - Safety - Part 21: Remote Power Feeding, for listing information on equipment that complies with 830.15(2).Table 830.15 Limitations for Network-Powered Broadband Communications Systems Network Power Source Low Medium Circuit voltage, Vmax (volts)1 0—100 0—150 Power limitation, VAmax (volt-amperes)1 250 250 Current limitation, Imax (amperes)1 1000/Vmax 1000/Vmax Maximum power rating (volt-amperes) 100 100 Maximum voltage rating (volts) 100 150 Maximum overcurrent protection (amperes)2 100/Vmax NA 1 Vmax, Imax, and VAmax are determined with the current-limiting impedance in the circuit (not bypassed) as follows:Vmax - Maximum system voltage regardless of load with rated input appliedImax - Maximum system current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed if used. Imax limits apply after 1 minute of operationVAmax - Maximum volt-ampere output after 1 minute of operation regardless of load and overcurrent protection bypassed if used2Overcurrent protection is not required if the current limiting device provides equivalent current limitation and the current-limiting device does not reset until power or the load is removed. [830.15](https://2023.antflix.net#830.15) | https://2023.antflix.net#830.15 |
Chapter 8 Communications Systems | 830.40 | Network-powered broadband communications cables located outside and entering buildings shall comply with 830.40(A) and (B). [830.40](https://2023.antflix.net#830.40) | https://2023.antflix.net#830.40 |
Chapter 8 Communications Systems | 830.40(A) | Medium-power network-powered broadband communications circuits located outside and entering buildings shall be installed using Type BMU, Type BM, or Type BMR network-powered broadband communications medium-power cables. [830.40(A)](https://2023.antflix.net#830.40(A)) | https://2023.antflix.net#830.40(A) |
Chapter 8 Communications Systems | 830.40(B) | Low-power network-powered broadband communications circuits located outside and entering buildings shall be installed using Type BLU or Type BLX low-power network-powered broadband communications cables. Cables shown in Table 830.154 shall be permitted to substitute. [830.40(B)](https://2023.antflix.net#830.40(B)) | https://2023.antflix.net#830.40(B) |
Chapter 8 Communications Systems | 830.44 | Overhead (aerial) network powered broadband communications cables shall comply with 830.44(A) through (F). [830.44](https://2023.antflix.net#830.44) | https://2023.antflix.net#830.44 |
Chapter 8 Communications Systems | 830.44(A) | Where network-powered broadband communications cables ate installed on poles and in-span or above roofs, they shall comply with 800.44. [830.44(A)](https://2023.antflix.net#830.44(A)) | https://2023.antflix.net#830.44(A) |
Chapter 8 Communications Systems | 830.44(B) | Overhead (aerial) spans of network-powered broadband communications cables shall conform to not less than the following: 2.9 m (91/2 ft) - above finished grade, sidewalks, or from any platform or projection from which they might be reached and accessible to pedestrians only3.5 m (111/2 ft) - over residential property and driveways, and those commercial areas not subject to truck traffic4.7 m (151/2 ft) - over public streets, alleys, roads, parking areas subject to truck traffic, driveways on other than residential property, and other land traversed by vehicles such as cultivated, grazing, forest, and orchardInformational Note: See ANSI/IEEE C2-2017, National Electrical Safety Code, Table 232-1, which provides for clearances of wires, conductors, and cables above ground and roadways, rather than using the clearances referenced in 225.18. [830.44(B)](https://2023.antflix.net#830.44(B)) | https://2023.antflix.net#830.44(B) |
Chapter 8 Communications Systems | 830.44(C) | Clearance of network-powered broadband communications cable in any direction from the water level, edge of pool, base of diving platform, or anchored raft shall comply with those clearances in 680.9. [830.44(C)](https://2023.antflix.net#830.44(C)) | https://2023.antflix.net#830.44(C) |
Chapter 8 Communications Systems | 830.44(D) | Final spans of network-powered broadband communications cables without an outer jacket shall be permitted to be attached to the building, but they shall be kept not less than 900 mm (3 ft) from windows that are designed to be opened, doors, porches, balconies, ladders, stairs, fire escapes, or similar locations. Exception: Conductors run above the top level of a window shall be permitted to be less than the 900-mm (3-ft) requirement above. Overhead (aerial) network-powered broadband communications cables shall not be installed beneath openings through which materials might be moved, such as openings in farm and commercial buildings, and shall not be installed where they obstruct entrance to these building openings. [830.44(D)](https://2023.antflix.net#830.44(D)) | https://2023.antflix.net#830.44(D) |
Chapter 8 Communications Systems | 830.44(E) | Network-powered broadband communications cables extending between buildings or structures, and also the supports or attachment fixtures, shall be identified as suitable for outdoor aerial applications and shall have sufficient strength to withstand the loads to which they may be subjected. Exception: Where a network-powered broadband communications cable does not have sufficient strength to be self-supporting, it shall be attached to a supporting messenger cable that, together with the attachment fixtures or supports, shall be acceptable for the purpose and shall have sufficient strength to withstand the loads to which they may be subjected. [830.44(E)](https://2023.antflix.net#830.44(E)) | https://2023.antflix.net#830.44(E) |
Chapter 8 Communications Systems | 830.44(F) | Where attached to buildings, network-powered broadband communications cables shall be securely fastened in such a manner that they are separated from other conductors in accordance with 830.44(F)(1) through (F)(3). [830.44(F)](https://2023.antflix.net#830.44(F)) | https://2023.antflix.net#830.44(F) |
Chapter 8 Communications Systems | 830.44(F)(1) | The network-powered broadband communications cable shall have a separation of at least 100 mm (4 in.) from electric light, power, Class 1, or non-power-limited fire alarm circuit conductors not in raceway or cable, or be permanently separated from conductors of the other system by a continuous and firmly fixed nonconductor in addition to the insulation on the wires. [830.44(F)(1)](https://2023.antflix.net#830.44(F)(1)) | https://2023.antflix.net#830.44(F)(1) |
Chapter 8 Communications Systems | 830.44(F)(2) | Network-powered broadband communications cables shall be installed so that there will be no unnecessary interference in the maintenance of the separate systems. In no case shall the conductors, cables, messenger strand, or equipment of one system cause abrasion to the conductors, cables, messenger strand, or equipment of any other system. [830.44(F)(2)](https://2023.antflix.net#830.44(F)(2)) | https://2023.antflix.net#830.44(F)(2) |
Chapter 8 Communications Systems | 830.44(F)(3) | Network-powered broadband communications cables attached to buildings or structures and located within 2.5 m (8 ft) of finished grade shall be protected by enclosures, raceways, or other approved means. Exception: A low-power network-powered broadband communications circuit that is equipped with a listed fault protection device, appropriate to the network-powered broadband communications cable used, and located on the network side of the network-powered broadband communications cable shall not be required to be additionally protected by enclosures, raceways, or other approved means. [830.44(F)(3)](https://2023.antflix.net#830.44(F)(3)) | https://2023.antflix.net#830.44(F)(3) |
Chapter 8 Communications Systems | 830.47 | Underground network-powered broadband communications cables entering buildings shall comply with 830.47(A) and (B). [830.47](https://2023.antflix.net#830.47) | https://2023.antflix.net#830.47 |
Chapter 8 Communications Systems | 830.47(A) | Direct-buried cable, conduit, or other raceways shall be installed to meet the minimum cover requirements of Table 830.47(A). In addition, direct-buried cables emerging from the ground shall be protected by enclosures, raceways, or other approved means extending from the minimum cover distance required by Table 830.47(A) below grade to a point at least 2.5 m (8 ft) above finished grade. In no case shall the protection be required to exceed 450 mm (18 in.) below finished grade. Types BMU and BLU direct-buried cables emerging from the ground shall be installed in rigid metal conduit (RMC), intermediate metal conduit (IMC), rigid nonmetallic conduit, or other approved means extending from the minimum cover distance required by Table 830.47(A) below grade to the point of entrance. Exception: Protection from physical damage shall not be required if a low-power network-powered broadband communications circuit is equipped with a listed fault protection device that is located on the network side of the network-powered broadband cable being protected and the device is appropriate to the network-powered broadband communications cable used.Table 830.47(A) Network-Powered Broadband Communications Systems Minimum Cover Requirements Location ofWiring Methodor Circuit Direct Burial Cables Rigid Metal Conduit (RMC)or Intermediate MetalConduit (IMC) Nonmetallic Raceways Listed forDirect Burial; Without ConcreteEncasement or Other ApprovedRaceways mm in. mm in. mm in. All locations not specified below 450 18 150 6 300 12 In trench below 50 mm (2 in.) thick concrete or equivalent 300 12 150 6 150 6 Under a building (in raceway only) 0 0 0 0 0 0 Under minimum of 100 mm (4 in.) thick concrete exterior slab with no vehicular traffic and the slab extending not less than 150 mm (6 in.) beyond the underground installation 300 12 100 4 100 4 One- and two-family dwelling driveways and outdoor parking areas and used only for dwelling-related purposes 300 12 300 12 300 12 Notes:Cover is the shortest distance measured between a point on the top surface of any direct-buried cable, conduit, or other raceway and the top surface of finished grade, concrete, or similar cover.Raceways approved for burial only where concrete encased shall require a concrete envelope not less than 50 mm (2 in.) thick.Lesser depths shall be permitted where cables rise for terminations or splices or where access is otherwise required.Where solid rock is encountered, all wiring shall be installed in metal or nonmetallic raceway permitted for direct burial.The raceways shall be covered by a minimum of 50 mm (2 in.) of concrete extending down to rock. [830.47(A)](https://2023.antflix.net#830.47(A)) | https://2023.antflix.net#830.47(A) |
Chapter 8 Communications Systems | 830.47(B) | Cables located under the pool or within the area extending 1.5 m (5 ft) horizontally from the inside wall of the pool shall meet those clearances and requirements specified in 680.11. [830.47(B)](https://2023.antflix.net#830.47(B)) | https://2023.antflix.net#830.47(B) |
Chapter 8 Communications Systems | 830.90(A) | Primary electrical protection shall be provided on all network-powered broadband communications conductors that are neither grounded nor interrupted and are run partly or entirely in aerial cable not confined within a block. Also, primary electrical protection shall be provided on all aerial or underground network-powered broadband communications conductors that are neither grounded nor interrupted and are located within the block containing the building served so as to be exposed to lightning or accidental contact with electric light or power conductors operating at over 300 volts to ground. Exception: Primary electrical protection shall not be required on the network-powered broadband communications conductors where electrical protection is provided on the derived circuit(s) (output side of the NIU) in accordance with 830.90(B)(3). Informational Note No. 1: On network-powered broadband communications conductors not exposed to lightning or accidental contact with power conductors, providing primary electrical protection in accordance with this article helps protect against other hazards, such as ground potential rise caused by power fault currents, and above-normal voltages induced by fault currents on power circuits in proximity to the network-powered broadband communications conductors. Informational Note No. 2: Network-powered broadband communications circuits are considered to have a lightning exposure unless one or more of the following conditions exist:Circuits in large metropolitan areas where buildings are close together and sufficiently high to intercept lightning.Areas having an average of five or fewer thunderstorm days each year and earth resistivity of less than 100 ohmmeters. Such areas are found along the Pacific coast.Informational Note No. 3: See NFPA 780-2020, Standard for the Installation of Lightning Protection Systems, for information on lightning protection systems. [830.90(A)](https://2023.antflix.net#830.90(A)) | https://2023.antflix.net#830.90(A) |
Chapter 8 Communications Systems | 830.90(A)(1) | Fuseless-type primary protectors shall be permitted where power fault currents on all protected conductors in the cable are safely limited to a value no greater than the current-carrying capacity of the primary protector and of the primary protector bonding conductor or grounding electrode conductor. [830.90(A)(1)](https://2023.antflix.net#830.90(A)(1)) | https://2023.antflix.net#830.90(A)(1) |
Chapter 8 Communications Systems | 830.90(A)(2) | Where the requirements listed in 830.90(A)(1) are not met, fused-type primary protectors shall be used. Fused-type primary protectors shall consist of an arrester connected between each conductor to be protected and ground, a fuse in series with each conductor to be protected, and an appropriate mounting arrangement. Fused primary protector terminals shall be marked to indicate line, instrument, and ground, as applicable. [830.90(A)(2)](https://2023.antflix.net#830.90(A)(2)) | https://2023.antflix.net#830.90(A)(2) |
Chapter 8 Communications Systems | 830.90(B) | The location of the primary protector, where required, shall comply with the following: A listed primary protector shall be applied on each network-powered broadband communications cable external to and on the network side of the network interface unit.The primary protector function shall be an integral part of and contained in the network interface unit. The network interface unit shall be listed as being suitable for application with network-powered broadband communications systems and shall have an external marking indicating that it contains primary electrical protection.The primary protector(s) shall be provided on the derived circuit(s) (output side of the NIU), and the combination of the NIU and the protector(s) shall be listed as being suitable for application with network-powered broadband communications systems.A primary protector, whether provided integrally or external to the network interface unit, shall be located as close as practicable to the point of entrance.For purposes of this section, a network interface unit and any externally provided primary protectors located at mobile home service equipment located in sight from and not more than 9.0 m (30 ft) from the exterior wall of the mobile home it serves, or at a mobile home disconnecting means grounded in accordance with 250.32 and located in sight from and not more than 9.0 m (30 ft) from the exterior wall of the mobile home it serves, shall be considered to meet the requirements of this section.Informational Note: Selecting a network interface unit and primary protector location to achieve the shortest practicable primary protector bonding conductor or grounding electrode conductor helps limit potential differences between communications circuits and other metallic systems. [830.90(B)](https://2023.antflix.net#830.90(B)) | https://2023.antflix.net#830.90(B) |
Chapter 8 Communications Systems | 830.90(C) | The primary protector or equipment providing the primary protection function shall not be located in any hazardous (classified) location as defined in 500.5 and 505.5 or in the vicinity of easily ignitible material. Exception: As permitted in 501.150, 502.150, and 503.150. [830.90(C)](https://2023.antflix.net#830.90(C)) | https://2023.antflix.net#830.90(C) |
Chapter 8 Communications Systems | 830.93 | Network-powered communications cables entering buildings or attaching to buildings shall comply with 830.93(A) or (B). For purposes of this section, grounding located at mobile home service equipment located within 9.0 m (30 ft) of the exterior wall of the mobile home it serves, or at a mobile home disconnecting means grounded in accordance with 250.32 and located within 9.0 m (30 ft) of the exterior wall of the mobile home it serves, shall be considered to meet the requirements of this section. Informational Note: Selecting a grounding location to achieve the shortest practicable bonding conductor or grounding electrode conductor helps limit potential differences between the network-powered broadband communications circuits and other metallic systems. [830.93](https://2023.antflix.net#830.93) | https://2023.antflix.net#830.93 |
Chapter 8 Communications Systems | 830.93(A) | In installations where the network-powered communications cable enters the building, the shield shall be grounded in accordance with 800.100, and metallic members of the cable not used for communications or powering shall be grounded in accordance with 800.100 or interrupted by an insulating joint or equivalent device. The grounding or interruption shall be as close as practicable to the point of entrance. [830.93(A)](https://2023.antflix.net#830.93(A)) | https://2023.antflix.net#830.93(A) |
Chapter 8 Communications Systems | 830.93(B) | In installations where the network-powered communications cable is terminated outside of the building, the shield shall be grounded in accordance with 800.100, and metallic members of the cable not used for communications or powering shall be grounded in accordance with 800.100 or interrupted by an insulating joint or equivalent device. The grounding or interruption shall be as close as practicable to the point of attachment of the NIU. [830.93(B)](https://2023.antflix.net#830.93(B)) | https://2023.antflix.net#830.93(B) |
Chapter 8 Communications Systems | 830.133 | Cable and equipment installations within buildings shall comply with 830.133(A) through (C), as applicable. [830.133](https://2023.antflix.net#830.133) | https://2023.antflix.net#830.133 |
Chapter 8 Communications Systems | 830.133(A)(1) |
Low- and Medium-Power Network-Powered Broadband Communications Circuit Cables. Low- and medium-power network-powered broadband communications cables shall be permitted in the same raceway, cable tray, box, enclosure, or cable routing assembly.
Low-Power Network-Powered Broadband Communications Circuit Cables with Other Circuits. Low-power network-powered broadband communications cables shall be permitted in the same raceway, cable tray, box, enclosure, or cable routing assembly with jacketed cables of any of the following circuits:
Class 2 and Class 3 remote-control, signaling, and power-limited circuits in compliance with Parts I and II of Article 725
Power-limited fire alarm systems in compliance with Parts I and III of Article 760
Communications circuits in compliance with Parts I and IV of Article 805
Nonconductive and conductive optical fiber cables in compliance with Parts I and V of Article 770
Community antenna television and radio distribution systems in compliance with Parts I and V of Article 820
Medium-Power Network-Powered Broadband Communications Circuit Cables with Optical Fiber Cables and Other Communications Cables. Medium-power network-powered broadband communications cables shall not be permitted in the same raceway, cable tray, box, enclosure, or cable routing assembly with conductors of any of the following circuits:
Communications circuits in compliance with Parts I and IV of Article 805
Conductive optical fiber cables in compliance with Parts I and V of Article 770
Community antenna television and radio distribution systems in compliance with Parts I and V of Article 820
Medium-Power Network-Powered Broadband Communications Circuit Cables with Other Circuits. Medium-power network-powered broadband communications cables shall not be permitted in the same raceway, cable tray, box, enclosure, or cable routing assembly with conductors of any of the following circuits:
Class 2 and Class 3 remote-control, signaling, and power-limited circuits in compliance with Parts I and II of Article 725
Power-limited fire alarm systems in compliance with Parts I and III of Article 760
Electric Light, Power, Class 1, Nonpowered Broadband Communications Circuit Cables. Network-powered broadband communications cable shall not be placed in any raceway, cable tray, compartment, outlet box, junction box, or similar fittings with conductors of electric light, power, Class 1, or non-power-limited fire alarm circuit cables.
Exception No. 1: Network-powered broadband communications cable shall be permitted to be placed in a raceway, cable tray, compartment, outlet box, junction box, or similar fittings with conductors of electric light, power, Class 1, or non-power-limited fire alarm circuit cables where all of the conductors of electric light, power, Class 1, non-power-limited fire alarm circuits are separated from all of the network-powered broadband communications cables by a permanent barrier or listed divider.
Exception No. 2: Where power circuit conductors in outlet boxes, junction boxes, or similar fittings or compartments where such conductors are introduced solely for power supply to the network-powered broadband communications system distribution equipment, the power circuit conductors shall be routed within the enclosure to maintain a minimum 6 mm (1/4 in.) separation from network-powered broadband communications cables. [830.133(A)(1)](https://2023.antflix.net#830.133(A)(1)) | https://2023.antflix.net#830.133(A)(1) |
Chapter 8 Communications Systems | 830.133(A)(2) | Network-powered broadband communications cable shall be separated at least 50 mm (2 in.) from conductors of any electric light, power, Class 1, and non-power-limited fire alarm circuits.
Exception No. 1: Separation shall not be. required where: (1) all of the conductors of electric light, power, Class 1, and non-power-limited fire alarm circuits are in a raceway or in metal-sheathed, metal-clad, nonmetallic-sheathed, Type AC, or Type UF cables, or (2) all of the network-powered broadband communications cables are encased in a raceway.
Exception No. 2: Separation shall not be required where the network-powered broadband communications cables are permanently separated from the conductors of electric light, power, Class 1, and non-power-limited fire alarm circuits by a continuous and firmly fixed nonconductor, such as porcelain tubes or flexible tubing, in addition to the insulation on the wire. [830.133(A)(2)](https://2023.antflix.net#830.133(A)(2)) | https://2023.antflix.net#830.133(A)(2) |
Chapter 8 Communications Systems | 830.133(B) | Raceways shall be used for their intended purpose. Network-powered broadband communications cables shall not be strapped, taped, or attached by any means to the exterior of any conduit or raceway as a means of support. [830.133(B)](https://2023.antflix.net#830.133(B)) | https://2023.antflix.net#830.133(B) |
Chapter 8 Communications Systems | 830.133(C) | Where a medium-powered network-powered broadband communications cable is spliced or extended, a listed junction box or listed patch panel shall be used. [830.133(C)](https://2023.antflix.net#830.133(C)) | https://2023.antflix.net#830.133(C) |
Chapter 8 Communications Systems | 830.154 | The substitutions for network-powered broadband system cables listed in Table 830.154 shall be permitted. Table 830.154 Cable Substitutions Cable Type Permitted Cable Substitutions BM BMR BLP CMP, CL3P BLR CMP, CL3P, CMR, CL3R, BLP, BMR BL CMP, CMR, CM, CMG, CL3P, CL3R, CL3, BMR, BM, BLP, BLR BLX CMP, CMR, CM, CMG, CMX, CL3P, CL3R, CL3, CL3X, BMR, BM, BLP, BRP, BL [830.154](https://2023.antflix.net#830.154) | https://2023.antflix.net#830.154 |
Chapter 8 Communications Systems | 830.160 | Bends in network broadband cable shall be made so as not to damage the cable. The radius of the curve of the inner edge of any bend shall not be less than 10 times the diameter of the cable. Informational Note: See ANSI/TIA-568.0-E Generic Telecommunications Cabling for Customer Premises, for information on bend radii of network broadband cable during different types of installation conditions. [830.160](https://2023.antflix.net#830.160) | https://2023.antflix.net#830.160 |
Chapter 8 Communications Systems | 830.179 | Network-powered broadband communications equipment and cables shall be listed and marked in accordance with 830.179(A) through (C). Exception No. 1: This listing requirement shall not apply to community antenna television and radio distribution system coaxial cables that were installed prior to January 1, 2000, in accordance with Article 820 and are used for low-power network-powered broadband communications circuits. Exception No. 2: Substitute cables for network-powered broadband communications cables shall be permitted as shown in Table 830.154. [830.179](https://2023.antflix.net#830.179) | https://2023.antflix.net#830.179 |
Chapter 8 Communications Systems | 830.179(A) | The general requirements in 800.179 shall apply. [830.179(A)](https://2023.antflix.net#830.179(A)) | https://2023.antflix.net#830.179(A) |
Chapter 8 Communications Systems | 830.179(B) | Network-powered broadband communications medium-power cables shall be factory-assembled cables consisting of a jacketed coaxial cable, a jacketed combination of coaxial cable and multiple individual conductors, or a jacketed combination of an optical fiber cable and multiple individual conductors. The insulation for the individual conductors shall be rated for 300 volts minimum. Cables intended for outdoor use shall be listed as suitable for the application. Cables shall be marked in accordance with 310.8. Type BMU cables shall be jacketed and listed as being suitable for outdoor underground use. [830.179(B)](https://2023.antflix.net#830.179(B)) | https://2023.antflix.net#830.179(B) |
Chapter 8 Communications Systems | 830.179(C) | Network-powered broadband communications low-power cables shall be factory-assembled cables consisting of a jacketed coaxial cable, a jacketed combination of coaxial cable and multiple individual conductors, or a jacketed combination of an optical fiber cable and multiple individual conductors. The insulation for the individual conductors shall be rated for 300 volts minimum. Cables intended for outdoor use shall be listed as suitable for the application. Cables shall be marked in accordance with 310.8. Type BLU cables shall be jacketed and listed as being suitable for outdoor underground use. Informational Note: See NFPA 780-2020, Standard for the Installation of Lightning Protection Systems, for the theory of the term rolling sphere. [830.179(C)](https://2023.antflix.net#830.179(C)) | https://2023.antflix.net#830.179(C) |
Chapter 8 Communications Systems | 840.1 | This article covers premises-powered broadband communications systems. Informational Note: A typical basic system configuration consists of an optical fiber, twisted pair, or coaxial cable to the premises supplying a broadband signal to a network terminal that converts the broadband signal into component signals, such as traditional telephone, video, high-speed Internet, and interactive services. Powering for the network terminal and network devices is typically accomplished through a premises power supply that might be built into the network terminal or provided as a separate unit. In order to provide communications in the event of a power interruption, a battery backup unit or an uninterruptible power supply (UPS) is typically part of the powering system. [840.1](https://2023.antflix.net#840.1) | https://2023.antflix.net#840.1 |
Chapter 8 Communications Systems | 840.47 | Direct-buried cables shall be installed to have a minimum cover of 150 mm (6 in.). [840.47](https://2023.antflix.net#840.47) | https://2023.antflix.net#840.47 |
Chapter 8 Communications Systems | 840.90 | The requirements of 805.90 shall apply. [840.90](https://2023.antflix.net#840.90) | https://2023.antflix.net#840.90 |
Chapter 8 Communications Systems | 840.93 | Non-current-carrying metallic members of optical fiber cables, communications cables, or coaxial cables entering buildings or attaching to buildings shall comply with 840.93(A), (B), or (C), respectively. [840.93](https://2023.antflix.net#840.93) | https://2023.antflix.net#840.93 |
Chapter 8 Communications Systems | 840.93(A) | Non-current-carrying metallic members of optical fiber cables entering a building or terminating on the outside of a building shall comply with 770.93(A) or (B). [840.93(A)](https://2023.antflix.net#840.93(A)) | https://2023.antflix.net#840.93(A) |
Chapter 8 Communications Systems | 840.93(B) | The grounding or interruption of the metallic sheath of communications cable shall comply with 805.93. [840.93(B)](https://2023.antflix.net#840.93(B)) | https://2023.antflix.net#840.93(B) |
Chapter 8 Communications Systems | 840.93(C) | Where the network terminal is installed inside or outside of the building, with coaxial cables terminating at the network terminal, and is either entering, exiting, or attached to the outside of the building, 820.93 shall apply. [840.93(C)](https://2023.antflix.net#840.93(C)) | https://2023.antflix.net#840.93(C) |
Chapter 8 Communications Systems | 840.94 | Where circuits leave the building to power equipment remote to the building or outside the exterior zone of protection defined by a 46 m (150 ft) radius rolling sphere, 805.90 and 805.93 shall apply. [840.94](https://2023.antflix.net#840.94) | https://2023.antflix.net#840.94 |
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