Editor March 14, 2026 NEC 800-860 NEC Quizzes Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% Article 800-860 Part01 This quiz consists of 25 carefully selected questions covering NEC Articles 800 through 860, which provide essential guidelines for communications systems (Article 800) and related technologies. These sections of the National Electrical Code focus on the safety, installation, and operation of critical infrastructure like general communications circuits (Article 800), community antenna television (CATV) and radio distribution systems (Article 820), network-powered broadband communications systems (Article 830), and premises-powered broadband communications systems (Article 840), along with requirements for premises-powered broadband communication systems over optical fiber (Article 860). The randomly generated questions ensure a thorough assessment of your understanding, reinforcing key principles related to specialized communication system requirements, grounding and bonding for communication circuits, equipment protection, circuit routing and separation, and the integration of these distinct systems within buildings. Some topics may reappear in different contexts to strengthen comprehension and application. Your feedback is invaluable! If you notice any discrepancies or have suggestions for improvement, please report them. Your insights help maintain the accuracy and effectiveness of this learning tool. Consider the NEC’s general requirements for buried cables and physical protection. 1 / 25 What is the minimum cover requirement for direct-buried cables entering buildings? a. 100 mm (4 in.) b. 50 mm (2 in.) c. 300 mm (12 in.) d. 150 mm (6 in.) Incorrect. The NEC specifies 150 mm as the minimum cover requirement. Correct! A 150 mm cover protects the cables and ensures compliance. Direct-buried cables must have a minimum cover of 150 mm (6 inches) to protect them from physical damage and ensure compliance with NEC standards. Think about ensuring electrical safety and grounding. 2 / 25 What grounding requirements apply to metal conduit containing entrance cables? a. It must be painted. b. It requires no special grounding. c. It must be bonded to a grounding electrode system. d. It must be wrapped in insulation. Incorrect. Proper grounding is necessary for safety. Correct! Grounding is essential to ensure safety and compliance. Metal conduit containing entrance cables must be properly bonded to a grounding electrode system to ensure electrical safety. Low-power systems have specific cable requirements for safe operation. 3 / 25 Which cable type is suitable for low-power network-powered broadband systems entering buildings? a. Type CMP b. Type BLU c. Type BMU d. Type BM Incorrect. Type BLU cables are specifically required for low-power systems. Correct! Type BLU is the correct cable type for low-power applications. Type BLU cables are designed for low-power network-powered broadband systems and meet the NEC requirements for cables entering buildings. Separation prevents interference and ensures safety. 4 / 25 What is the minimum separation required between communications cables and power conductors in direct-buried installations? a. 600 mm (24 in.) b. 450 mm (18 in.) c. 150 mm (6 in.) d. 300 mm (12 in.) Incorrect. The NEC specifies 12 inches as the minimum. Correct! This separation minimizes interference and ensures safety NEC requires a minimum of 300 mm (12 in.) separation between communications cables and power conductors in direct-buried installations. Focus on standards addressing low smoke and heat release. 5 / 25 Which standard applies to cable ties used in plenums? a. NEC Article 310 b. NFPA 70E c. ANSI/IEEE 802.3 d. ANSI/UL 2043 Incorrect. This standard ensures cable ties meet plenum safety requirements. Correct! ANSI/UL 2043 is the relevant standard for plenum cable ties. Cable ties used in plenums must comply with ANSI/UL 2043, ensuring they produce low smoke and heat release. Think about materials commonly used for grounding. 6 / 25 Which material is required for grounding electrode conductors in communications systems? a. Only aluminum b. Only copper c. Aluminum or copper d. Stainless steel Incorrect. Both aluminum and copper are permissible for this purpose. Correct! These materials ensure conductivity and reliability. Grounding electrode conductors in communications systems can be made of aluminum or copper, as both are highly conductive and corrosionresistant Look for grounding and bonding in Article 800. 7 / 25 Which NEC section outlines grounding and bonding requirements for communications systems? a. 300.21 b. 770.110 c. 250.118 d. 800.100 Incorrect. Grounding and bonding requirements are in Section 800.100. Correct! Section 800.100 is the relevant NEC section. Section 800.100 provides detailed requirements for grounding and bonding communications systems to ensure safety and compliance. Think about fire-resistance requirements for air-handling spaces. 8 / 25 What type of cables are suitable for use in air-handling spaces (plenums)? a. Riser cables b. Underground cables c. General-purpose cables d. Plenum cables Incorrect. Only plenum-rated cables meet these specific requirements. Correct! Plenum cables are designed for this purpose. Plenum-rated cables are designed to resist fire and minimize smoke, making them suitable for use in plenums. Focus on grounding and protection standards for circuits extending outside. 9 / 25 What is required for communications circuits that leave the building and extend beyond the exterior zone of protection? a. They must be enclosed in metal conduit. b. They must comply with Sections 800.100 and 800.106. c. They must use shielded cables only. d. Grounding is not required for such circuits. Incorrect. Compliance with grounding and protection standards is mandatory for such circuits. Correct! Compliance with Sections 800.100 and 800.106 ensures safety and NEC adherence. Communications circuits leaving the building must comply with Sections 800.100 (bonding and grounding) and 800.106 (protection from physical damage) to ensure safety. Separation reduces interference and ensures safety. 10 / 25 What is required when communications cables are installed parallel to electric light or power conductors? a. They must be separated by at least 50 mm (2 inches). b. They must be separated by at least 50 mm (2 inches). c. They must be separated by at least 100 mm (4 inches). d. They must be installed with an insulating barrier. Incorrect. The NEC specifies a minimum 2-inch separation. Correct! This ensures interference-free operation. Communications cables must maintain at least a 50 mm (2-inch) separation from power conductors to prevent interference and ensure safety. This restriction minimizes fire hazards within buildings. 11 / 25 What is the maximum allowed length for unlisted communications cables entering a building? a. 20 m (66 ft) b. 15 m (50 ft) c. 10 m (33 ft) d. 20 m (66 ft) Incorrect. Unlisted cables are restricted to 50 feet. Correct! This length limit aligns with NEC standards. Unlisted communications cables may enter a building up to a maximum of 15 meters (50 feet) to ensure compliance with fire safety standards. Focus on the cable’s ability to withstand environmental conditions. 12 / 25 What must be done if communications cables are installed near equipment that generates heat? a. Use cables with a temperature rating suitable for the environment. b. Paint the cables with heat-reflective paint. c. Wrap the cables in fire-resistant tape. d. Install the cables in a separate enclosure. Incorrect. Cables must meet the temperature requirements of their installation environment. Correct! Temperature ratings ensure cable safety and performance. Cables must be selected based on their ability to endure the temperatures of their operating environment to prevent damage and maintain performance. Safety and fire hazard reduction are priorities for abandoned cables. 13 / 25 What marking is required for abandoned communications cables? a. Stamping with "Obsolete." b. Painting the cables red. c. A green stripe for future use. d. Removal or durable tagging. Incorrect. Abandoned cables must be addressed for safety compliance. Correct! Removal or tagging is necessary to maintain safety standards. Abandoned communications cables must be removed or tagged for future use to ensure safety and compliance with NEC fire safety standards. Communications circuits are limited to low voltage for safety. 14 / 25 What is the maximum voltage permitted on communications circuits? a. 600 volts b. 150 volts c. 300 volts d. 90 volts Incorrect. Communications systems are limited to lower voltages. Correct! 90 volts is the specified maximum. Communications circuits are limited to a maximum of 90 volts to reduce the risk of electric shock and ensure safety Think about where communications cables overlap with power-limited circuits. 15 / 25 Which article provides guidelines for the substitution of communications cables for Class 2 and Class 3 cables? a. Article 800 b. Article 770 c. Article 722 d. Article 760 Incorrect. Article 722 deals with these substitutions. Correct! Article 722 includes this provision. Article 722 addresses the substitution of communications cables for Class 2 and Class 3 circuits, providing specific conditions under which substitutions are permitted. Think about systems that are powered by premises power supplies for communication services. 16 / 25 What is the primary scope of Article 840? a. Installation of premises-powered broadband communications systems. b. Guidelines for Power over Ethernet (PoE) systems only. c. Wiring requirements for network-powered broadband systems. d. Maintenance of traditional telephone systems. Incorrect. Article 840 is specific to premises-powered systems, not network-powered systems. Correct! This article focuses on premises-powered broadband communication systems. Article 840 addresses premises-powered broadband communications systems, which include systems powered by a local power source within the premises, providing services like voice, video, and Internet. Outdoor installations must withstand environmental exposure. 17 / 25 What type of enclosure must be used for communications equipment installed outdoors? a. Fire-rated enclosures b. Ventilated enclosures c. Weatherproof enclosures d. Non-metallic only Incorrect. Outdoor equipment requires weatherproof protection. Correct! Weatherproof enclosures ensure equipment durability. Communications equipment installed outdoors must be housed in weatherproof enclosures to protect against moisture and environmental damage. Safety, not the number of cables, is the primary concern. 18 / 25 What is the maximum allowed number of communications cables bundled together in plenums? a. 100 cables b. 50 cables c. 75 cables d. No specific maximum, provided fire safety is maintained Incorrect. Fire safety, not a strict number, governs cable bundling. Correct! Fire safety compliance is the key consideration. The NEC does not impose a maximum number of cables but requires that fire safety be maintained, including compliance with plenum-rated standards. Grounding conductor size is related to safety and capacity. 19 / 25 What is the minimum size for grounding conductors used for communications systems? a. 10 AWG b. 18 AWG c. 12 AWG d. 14 AWG Incorrect. The NEC specifies 14 AWG as the minimum size. Correct! 14 AWG is the required minimum size for grounding conductors. NEC requires a minimum size of 14 AWG for grounding conductors in communications systems General-use cables have the broadest application but limited fire-resistance standards. 20 / 25 Which type of communications cable is suitable for general use but not for risers or plenums? a. CMR cables b. CMP cables c. CM cables d. OFCP cables Incorrect. CM cables are for general use only. Correct! CM cables are the general-purpose option. CM cables are designed for general use and do not meet the stricter fire-resistance standards required for risers or plenums. Fire-resistance is critical in such installations. 21 / 25 What is required for communications cables passing through fire-rated walls? a. Encased in metal conduit. b. Wrapped in heat-resistant tape. c. Firestopped to maintain the fire-resistance rating. d. Painted red for identification. Incorrect. Firestopping is required to maintain compliance Correct! Firestopping ensures compliance and safety. Penetrations through fire-rated walls must be firestopped to preserve the wall’s fire-resistance rating. Underground environments often involve moisture exposure. 22 / 25 What is the requirement for optical fiber cables installed in underground raceways? a. They must have a direct-burial rating. b. They must be water-resistant or in a watertight raceway. c. They must have fire-resistant outer jackets. d. They must be in metal raceways only. Incorrect. Underground installations must account for moisture exposure. Correct! Water-resistance or watertight protection is necessary. Optical fiber cables in underground raceways must be water-resistant or installed in watertight raceways to prevent damage. Consider markings that indicate riser-specific suitability. 23 / 25 What marking is required on communications cables intended for riser use? a. A green outer sheath b. The suffix “CMR” c. The word “RISER” embossed on the jacket d. “FIRE RESISTANT” label Incorrect. Riser cables must be identified with the “CMR” suffix. Correct! “CMR” denotes cables suitable for riser applications. Riser-rated cables are marked with the suffix “CMR” to identify their compliance with NEC requirements for vertical runs in riser spaces. Consider systems related to communications and network installations. 24 / 25 What is the scope of Article 800? a. General requirements for communications systems. b. Requirements for high-voltage power systems. c. Installation guidelines for lighting systems. d. Construction standards for electrical raceways. Incorrect. The focus of Article 800 is communications systems, not high-voltage or lighting systems. Correct! Article 800 addresses general requirements for communications systems. Article 800 sets forth general requirements for various communications systems, including circuits and broadband systems. Separation reduces the risk of electrical interference and hazards. 25 / 25 What is the minimum separation required between network-powered broadband communications cables and electric light or power conductors? a. 150 mm (6 in.) b. 25 mm (1 in.) c. 100 mm (4 in.) d. 50 mm (2 in.) Incorrect. The NEC specifies a 4-inch separation for these installations. Correct! This separation ensures safe and interference-free operation. Network-powered broadband communications cables must maintain a minimum separation of 100 mm (4 in.) from electric light or power conductors to ensure safety and prevent interference. 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