eep April 7, 2025 NEC 300-399 NEC Quizzes Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% Article 300-399 Part06 This comprehensive quiz contains 50 questions carefully selected from the National Electrical Code (NEC) Articles spanning 300 through 399. This section of the NEC addresses crucial aspects of wiring methods, materials, and general requirements for electrical installations within this portion of the code. The questions in this quiz are chosen randomly to provide a thorough assessment of your knowledge across these essential NEC articles. While we strive for a diverse set of questions, some fundamental principles may be revisited in different contexts due to their relevance to multiple sections within this range. This approach ensures a robust evaluation of your understanding. We encourage you to actively participate and provide feedback. If you identify any issues or have suggestions for improving the quiz questions, please report them. Your contributions are invaluable in helping us maintain the accuracy and effectiveness of these learning resources. Wet locations require materials that resist environmental damage. 1 / 50 What material must be used for raceways supporting boxes in wet locations (314.23(B)(2))? a. Nonmetallic materials only. b. No material restrictions are specified. c. Corrosion-resistant metal or materials listed for wet locations. d. Rigid polyvinyl chloride (PVC) only. Incorrect. Only corrosion-resistant or listed materials are acceptable. Correct! Materials must be corrosion-resistant or listed for wet locations. Raceways in wet locations must be made of corrosion-resistant materials or listed specifically for use in such conditions. Approval ensures safety and compliance. 2 / 50 What is required for nonmetallic cabinets per 312.100(C)? a. Nonmetallic cabinets require no approval if used indoors. b. They must have a minimum thickness of 0.053 inches. c. They must be listed or approved before installation. d. They must be painted to match the installation site. Incorrect. Nonmetallic cabinets must be listed or approved before installation. Correct! Listing or approval is mandatory for nonmetallic cabinets. Nonmetallic cabinets must either be listed or approved for the specific installation to ensure they meet safety standards. Openings must prevent accidental entry or damage. 3 / 50 How should unused openings in boxes or conduit bodies be handled (314.17(A))? a. Left open for future use. b. Closed in an approved manner. c. Secured with plastic caps. d. Covered with electrical tape. Incorrect. Unused openings must be properly closed. Correct! Openings must be closed using approved methods. All unused openings must be closed in an approved manner to ensure the integrity and safety of the enclosure. Regular marking ensures easy identification. 4 / 50 What is the required marking interval for Type MV cable size (315.16(B) (1))? a. Every 1 meter (40 inches). b. Every 610 mm (24 inches). c. Marking intervals are not specified. d. Only at the beginning and end of the reel. Incorrect. The size marking interval is every 610 mm (24 inches). Correct! Cables must be marked every 610 mm. Type MV cable size markings must be repeated every 610 mm to ensure clear and consistent identification during installation. Smaller conductors require less depth but still have specific requirements. 5 / 50 What is the minimum depth for outlet boxes that enclose conductors 14 AWG or smaller (314.24(B)(5))? a. No minimum depth is specified. b. 12.7 mm (1/2 inch). c. 23.8 mm (15/16 inch). d. 30.2 mm (1-3/16 inch). Incorrect. The required depth is 23.8 mm (15/16 inch). Correct! The minimum depth for 14 AWG conductors is 23.8 mm. Outlet boxes for conductors 14 AWG or smaller must have a minimum depth of 23.8 mm to accommodate the conductors safely. Bends must avoid damaging the cable. 6 / 50 What is the minimum bending radius for Type AC cable (320.24)? a. Three times the cable diameter. b. No minimum bending radius is specified. c. Five times the cable diameter. d. Seven times the cable diameter. Incorrect. The correct minimum bending radius is five times the diameter. Correct! The minimum bending radius is five times the cable diameter. The radius of the inner edge of any bend must be at least five times the diameter of the Type AC cable to prevent damage. Marking ensures compatibility and traceability. 7 / 50 How must Type MV cable joints be marked (315.17(B))? a. With the installation date. b. Using surface or tag marking. c. Only with the manufacturer’s name. d. No markings are required. Incorrect. Marking is mandatory for identification. Correct! Markings can be surface-based or tagged. MV cable joints must be marked either on the surface or using a tag to provide essential information for proper use. Not all box shapes are suitable for all types of connections 8 / 50 Which type of boxes are prohibited for connections requiring locknuts or bushings (314.2)? a. FS boxes. b. Metal boxes. c. Square boxes. d. Round boxes. Incorrect. Round boxes are not suitable for these types of connections. Correct! Round boxes are not allowed for such connections. Round boxes are not permitted for use with conduits or connectors requiring locknuts or bushings, as they do not support these connections effectively Support intervals are determined by proximity to terminations. 9 / 50 How frequently must MV cables be supported when terminated in equipment (315.40)? a. Every 3 feet for all installations. b. Every 10 feet. c. No specific support intervals are required. d. Every 5 feet from terminations and 6 feet between supports. Incorrect. The required intervals are 5 feet near terminations and 6 feet between supports. Correct! Support requirements depend on proximity to terminations. Cables must be supported every 5 feet from terminations and at intervals of up to 6 feet elsewhere to ensure proper installation. Divided spaces in a box are treated differently. 10 / 50 What is required for permanent barriers within a box (314.28(D))? a. They must be metal. b. No requirements are specified. c. Each section created must be treated as a separate box. d. They can be temporary if marked. Incorrect. Permanent barriers create separate spaces for calculation. Correct! Each section is treated as a separate box. When permanent barriers are installed, each section must be considered a separate box for fill and volume calculations. Faster fault clearing allows lower insulation levels. 11 / 50 What insulation level is required for systems with ground faults cleared in less than one minute (315.10(C)(1))? a. No specific insulation level is required. b. 173 percent insulation level. c. 100 percent insulation level. d. 133 percent insulation level. Incorrect. A 100 percent insulation level is required for rapid fault clearance. Correct! Fast fault clearance allows 100 percent insulation. A 100 percent insulation level is sufficient for systems with fast fault clearing within one minute. Corrosive environments demand tailored solutions. 12 / 50 What is required for cable joints and terminations used in corrosive conditions (315.32(B)(6))? a. No special requirements are needed. b. Must have a special sealant. c. Must be suitable for the specific corrosive conditions. d. Must be metallic. Incorrect. They must be suited to the specific conditions. Correct! Components must handle the corrosive environment. Joints and terminations must be specifically designed for the corrosive substances they will be exposed to, ensuring longevity and safety. Protection against abrasion is key. 13 / 50 What is required for cables entering enclosures under 312.5(A)? a. No securing is required for cables with nonmetallic sheaths. b. The cable sheath must be stripped completely outside the enclosure. c. Openings must be closed in an approved manner to prevent abrasion. d. They must be secured at least 6 inches from the enclosure. Incorrect. Cable entry points must be properly closed. Correct! Properly closed openings prevent cable abrasion. Cables must enter enclosures through closed openings in an approved manner to prevent abrasion or damage to the insulation. Combustible materials need specific installation guidelines 14 / 50 How far must the front edge of cabinets be from the finished wall surface in combustible walls (312.3)? a. Set back no more than 6 mm (1/4 inch). b. No specific requirement is mentioned. c. Flush with the surface or recessed. d. Flush with the finished surface or projecting beyond it. Incorrect. Cabinets cannot be recessed into combustible walls. Correct! Cabinets must not be recessed into combustible walls. Cabinets must be flush with or project beyond the finished wall surface to prevent hazards in combustible walls. Shielding addresses electrical stresses. 15 / 50 What is the purpose of shielding in medium voltage cables (315.44)? a. To confine voltage stresses and dissipate insulation leakage current. b. To improve current-carrying capacity. c. To reduce heat dissipation. d. To provide additional mechanical strength. Incorrect. Shielding primarily manages electrical stresses and leakage. Correct! Shielding handles voltage stresses and leakage currents. Shielding confines voltage stresses within the insulation and safely dissipates insulation leakage currents to prevent damage. Metallic shields manage electrical phenomena. 16 / 50 What is the primary purpose of metallic insulation shields in MV cables (315.44)? a. To prevent corona discharge and reduce high-voltage stresses. b. To enhance mechanical protection. c. To increase the ampacity of the cable. d. To improve flexibility during installation. Incorrect. The shield primarily addresses electrical issues like corona discharge. Correct! The shield prevents corona discharge and manages voltage stresses. Metallic insulation shields prevent corona discharge by confining voltage stresses and ensure safe dissipation of capacitive currents. This marking helps ensure proper installation for fans. 17 / 50 What marking is required for ceiling outlet boxes supporting paddle fans (314.27(C))? a. The maximum weight the box is rated to support. b. No marking is required. c. “For Residential Use Only.” d. “Listed for Luminaire Use.” Incorrect. Marking the maximum weight is mandatory for fan-supporting boxes. Correct! Boxes must be marked with their weight rating. Ceiling outlet boxes used to support paddle fans must be marked to indicate the maximum weight they can support, ensuring compatibility and safety. Markings ensure proper identification and use. 18 / 50 What marking is required for Type MV cables (315.16(A))? a. Date of manufacture only. b. Maximum ampacity and color coding. c. Maximum length and insulation type. d. Maximum rated voltage, type letters, manufacturer’s name, and AWG size. Incorrect. These markings provide essential information for installation. Correct! The required markings ensure proper identification. Markings on Type MV cables include voltage, type letters, manufacturer identification, and conductor size for clear identification. Type AC cables are used in low- to medium-voltage applications. 19 / 50 What is the voltage rating for Type AC cable as specified in Article 320.1? a. 300 volts or less. b. Up to 1000 volts. c. 600 volts or less. d. 250 volts for residential applications. Incorrect. Type AC cables are rated for 600 volts or less. Correct! The voltage rating for Type AC cable is 600 volts or less. Type AC cable is rated for use in systems operating at 600 volts or less, as specified in the NEC. Adequate spacing ensures proper heat dissipation. 20 / 50 What is the minimum spacing between MV cables for parallel runs to avoid derating (315.50)? a. No minimum spacing is required. b. 1 cable diameter. c. 1 inch. d. 2 cable diameters. Incorrect. The spacing must be at least one cable diameter. Correct! Spacing prevents the need for ampacity derating. A spacing of at least one cable diameter between parallel runs prevents the need for derating by allowing for adequate heat dissipation. Distance requirements ensure proper support. 21 / 50 What is the required spacing for raceway-supported boxes without devices or luminaires (314.23(E))? a. Spacing depends on conductor size. b. No specific spacing is required. c. At least 300 mm (12 inches) apart. d. The raceways must be within 450 mm (18 inches) of the box. Incorrect. The spacing is specified as 450 mm. Correct! The maximum spacing is 450 mm (18 inches). Raceways supporting boxes without devices or luminaires must be within 450 mm of the enclosure to provide adequate support. Vibrations can compromise connections. 22 / 50 What is required for MV cable installations subject to vibration (315.40(B)(2))? a. The cables must be replaced with vibration-rated types. b. They must be secured at 3-foot intervals. c. No additional measures are needed. d. Cable supports or terminations must include vibration dampening devices. Incorrect. Vibration dampening devices are necessary in such installations Correct! Dampening devices ensure connections remain secure. Vibration dampening devices must be used to prevent damage to supports or terminations in environments with significant vibration. Proper equipment for wet locations is essential. 23 / 50 How should boxes be installed in damp or wet locations (314.15)? a. Covered with nonmetallic material. b. With a moisture barrier. c. Installed at least 12 inches above the ground. d. Listed for use in wet locations and equipped to prevent moisture entry. Incorrect. Boxes must be specifically listed and equipped for wet locations. Correct! Proper listing and moisture prevention are required. Boxes in wet or damp locations must be listed for such use and must prevent moisture from entering or accumulating within the box. Fastener length is critical for safety. 24 / 50 What is the requirement for screws or fasteners in boxes larger than 1650 cm³ (314.5)? a. They must not penetrate the wall. b. They must not extend more than 6 mm (1/4 inch) unless protected. c. There are no specific requirements for fasteners. d. They can extend up to 12 mm (1/2 inch). Incorrect. The length of screws is limited to prevent interference with conductors. Correct! Fastener length must comply with this limitation. Screws or fasteners in large boxes must not extend more than 6 mm unless protected to avoid damage to conductors. Proper grounding ensures safety and performance. 25 / 50 How must MV cable shields be grounded at terminations (315.56(A))? a. Only at one end of the cable. b. Grounded at each termination point. c. Shields are not required to be grounded. d. At both ends and the midpoint. Incorrect. Grounding is mandatory at each termination. Correct! Shields must be grounded at all terminations. MV cable shields must be grounded at each termination to safely dissipate capacitive and fault currents. Compliance deadlines are specified. 26 / 50 What is the listing requirement for medium voltage cables and associated components (315.6)? a. Must be listed, with compliance effective January 1, 2026. b. Can be unlisted for temporary installations. c. No listing is required for accessories like connectors. d. Must be tested only if installed in hazardous locations. Incorrect. Listing is mandatory for these components after the specified date. Correct! Listing ensures safety and compliance. Medium voltage cables, joints, terminations, and connectors must be listed for use, with a deadline of January 1, 2026, for mandatory compliance. Conductor size increases with voltage rating. 27 / 50 What is the minimum conductor size for voltages between 2001 and 5000 volts (315.12(A))? a. 10 AWG. b. 6 AWG. c. 10 AWG. d. 8 AWG. Incorrect. The correct minimum size is 8 AWG. Correct! 8 AWG is the minimum size. For medium voltage systems within this range, the minimum conductor size is 8 AWG for safety and capacity. Splice and tap installations have specific space limitations. 28 / 50 What is the maximum allowable cross-sectional fill for conductors in enclosures with splices and taps (312.8(A))? a. 75% of the cross-sectional area. b. 90% of the cross-sectional area. c. No limit if the enclosure is labeled for it. d. 50% of the enclosure volume. Incorrect. Conductors cannot exceed 75% of the enclosure’s cross-sectional Correct! The cross-sectional area limit is 75%. The total area of conductors, splices, and taps must not exceed 75% of the cross-sectional area of the wiring space. This rule ensures proper conductor bending space. 29 / 50 What is the required size for straight pull boxes containing 4 AWG conductors or larger (314.28(A)(1))? a. Equal to the sum of all raceway diameters. b. No minimum size is specified. c. At least eight times the trade size of the largest raceway. d. At least six times the trade size of the largest raceway. Incorrect. The requirement is eight times the largest raceway size. Correct! The box must be at least eight times the trade size of the largest raceway. For straight pulls, the box length must be at least eight times the trade size of the largest raceway to provide adequate bending space. Exceptions allow for bonding in specific configurations. 30 / 50 Under what conditions can nonmetallic boxes be used with metal raceways (314.3)? a. When the box is surface mounted. b. When internal bonding means are provided for all entries. c. Only when using an additional grounding clamp. d. Nonmetallic boxes cannot be used with metal raceways. Incorrect. Bonding means are required to use nonmetallic boxes with metal raceways. Correct! Internal bonding allows this combination. Nonmetallic boxes can be used with metal raceways if internal bonding means are provided between all entries to ensure continuity. Article 314 pertains to specific enclosures and their applications. 31 / 50 What does Article 314 primarily address? a. Conductor ampacity adjustments. b. Grounding of electrical systems. c. Installation and use of boxes, conduit bodies, fittings, and handhole enclosures. d. Voltage drop calculations. Incorrect. Article 314 focuses on boxes and conduit bodies, not grounding or conductor adjustments. Correct! This article governs the installation and use of these enclosures. Article 314 provides rules for the installation and use of boxes, conduit bodies, and other enclosures in electrical systems. Specific configurations are allowed for nonshielded cables. 32 / 50 Which cables are allowed for direct burial without shielding (315.36 Exception No. 1)? a. Cables with ozone-resistant insulation only. b. Nonshielded multiconductor cables rated 2001 to 2400 volts with an overall metallic sheath. c. Nonshielded cables with a thermoplastic jacket. d. All cables rated up to 15,000 volts. Incorrect. Only cables meeting these specific criteria are allowed. Correct! These cables meet the exception requirements. Nonshielded multiconductor cables with an overall metallic sheath and rated 2001 to 2400 volts are permitted for direct burial under specified conditions. Multiple materials are permitted. 33 / 50 What conductor materials are allowed in medium voltage applications (315.12(B))? a. Copper-clad steel only. b. Only copper. c. Copper, aluminum, or copper-clad aluminum. d. Only aluminum. Incorrect. These materials are specified for medium voltage applications. Correct! These three materials are permitted. Medium voltage conductors can be made of copper, aluminum, or copper-clad aluminum, offering flexibility in material choice. Covers must indicate their purpose and provide security. 34 / 50 What is the minimum required dimension for a handhole enclosure cover (314.30(D))? a. 22 cm by 22 cm. b. Covers are optional for underground installations. c. Large enough to allow conduit entry. d. Marked with the function (e.g., “electric”) and requiring tools or weighing over 45 kg. Incorrect. Covers must meet marking and security requirements. Correct! Covers must be marked and either secured or heavy enough for safety. Handhole enclosure covers must prominently indicate their function, require tools for removal, or weigh more than 45 kg. Sunlight exposure can degrade materials. 35 / 50 What is required for MV cables exposed to direct sunlight (315.32(A) (8))? a. No special requirements are needed. b. Must be identified as sunlight-resistant. c. Must use additional insulation layers. d. Must be buried to avoid direct sunlight. Incorrect. Sunlight resistance is mandatory for such installations. Correct! Cables must be sunlight-resistant for direct exposure. Cables exposed to direct sunlight must be identified as sunlight-resistant to prevent degradation over time. Type AC cable has specific restrictions regarding moisture and exposure. 36 / 50 Where can Type AC cable be installed as per 320.10? a. Exposed to physical damage. b. In wet locations. c. In both exposed and concealed installations in dry locations. d. In areas with excessive moisture or dampness. Incorrect. Type AC cable cannot be used in wet or damp locations. Correct! Type AC cable is suitable for dry locations in both exposed and concealed installations. Type AC cable is permitted for use in exposed or concealed installations but only in dry locations. Bushings or smooth surfaces prevent wear and damage. 37 / 50 How must flexible cord pendants in boxes be supported (314.25(C))? a. With approved bushings or smooth, well-rounded surfaces. b. Secured with electrical tape. c. With staples at each end. d. Support is not required for flexible cords. Incorrect. Bushings or smooth surfaces are mandatory. Correct! Proper support ensures durability and safety Flexible cord pendants must be supported using approved bushings or smooth, well-rounded surfaces to avoid abrasion or wear. Lower voltage systems have reduced spacing requirements. 38 / 50 What is the airspace requirement for live parts in cabinets containing voltages up to 250 volts (312.101(A)(3))? a. No specific airspace is required for voltages below 250 volts. b. At least 1/2 inch (12.7 mm). c. 1/4 inch (6 mm) is sufficient. d. At least 1 inch (25.4 mm). Incorrect. Check the minimum airspace requirement for voltages up to 250 volts. Correct! The required airspace is at least 1/2 inch for these systems. For voltages up to 250 volts, a minimum airspace of 1/2 inch is required between live parts and the cabinet walls. Protection against water is a key consideration. 39 / 50 What is required for enclosures installed in wet locations per 312.2? a. Only metallic enclosures are allowed. b. Must include grounding lugs. c. No additional requirements if using nonmetallic materials. d. Must be weatherproof and mounted with at least 1/4-inch airspace from the wall. Incorrect. Wet locations require weatherproof enclosures with airspace. Correct! Weatherproofing and mounting requirements apply in wet locations. Enclosures in wet locations must be weatherproof and have a 1/4-inch airspace between the enclosure and supporting surface for drainage and ventilation. High voltage installations demand specialized skills. 40 / 50 Who must perform the installation of MV cable terminations (315.30)? a. Any licensed electrician. b. Qualified persons with documented training and experience. c. No specific qualifications are required. d. Manufacturer representatives only. Incorrect. Only qualified individuals may perform these installations. Correct! Proper training and experience are mandatory. MV cable terminations must be installed by qualified individuals with training and experience to ensure safety and compliance. Submersion depth is explicitly limited. 41 / 50 What is the maximum depth of water for submerged MV cable terminations (315.32(B)(3))? a. 10 feet. b. No limit if properly insulated. c. 15 feet. d. 23 feet (7 meters). Incorrect. The maximum depth for submersion is 23 feet. Correct! 23 feet is the maximum submersion depth. MV cable terminations are rated for submersion in water up to a depth of 23 feet to maintain integrity and performance. Increased depth impacts heat dissipation. 42 / 50 What is the burial depth adjustment factor for MV cables when depth increases beyond table values (315.60(D)(2)(b))? a. No adjustment is needed for burial depth. b. 6% per 1 foot (300 mm). c. 10% per meter. d. 2% per foot. Incorrect. The correct adjustment factor is 6% per foot. Correct! Ampacity is adjusted by 6% per foot. Burial depth adjustments reduce ampacity by 6% per additional foot of depth to account for heat dissipation challenges. Fasteners should not protrude excessively. 43 / 50 How should screws or fasteners in cabinets be installed (312.10)? a. Any type of screw is acceptable. b. Blunt-ended screws extending no more than 1/4 inch unless protected. c. Blunt-ended screws are required, extending no more than 1 inch. d. No screws are allowed in wiring spaces. Incorrect. Fasteners must comply with the 1/4-inch limitation unless protected. Correct! Blunt-ended screws with limited extension are required. Screws or fasteners must have blunt ends and extend no more than 1/4 inch into the enclosure unless protected. Article 315 focuses on medium voltage systems. 44 / 50 What voltage range does Article 315 cover? a. 1001 volts to 5000 volts. b. Only above 35,000 volts AC. c. Up to 2000 volts AC and DC. d. 2001 volts to 35,000 volts AC and 2001 volts to 2500 volts DC, nominal. Incorrect. Article 315 is for 2001 to 35,000 volts AC and 2001 to 2500 volts DC. Correct! Article 315 covers this voltage range. This article specifically addresses medium voltage conductors, cables, joints, and terminations within the specified voltage range. Weight limits for boxes ensure proper support. 45 / 50 What is required for outlet boxes used as sole support for luminaires weighing more than 23 kg (50 lbs) (314.27(A)(2))? a. They require additional reinforcement brackets. b. They must be metallic. c. They must be surface mounted. d. They must be listed for the weight to be supported. Incorrect. The box must be specifically listed for the weight it supports. Correct! Boxes must be listed for the weight of heavy luminaires. Outlet boxes used as sole support for heavy luminaires must be listed for the weight they are designed to hold, ensuring safety and stability. Large pull boxes require organized conductors. 46 / 50 How must conductors be handled in pull boxes larger than 1.8 m (6 ft) (314.28(B))? a. No specific requirements. b. Allowed to rest loosely. c. Cabled or racked up in an approved manner. d. Secured with insulated staples. Incorrect. Conductors must be cabled or racked in an approved manner. Correct! Proper organization of conductors is mandatory. Conductors in large pull boxes must be neatly cabled or racked to maintain organization and accessibility. Higher voltage systems require more airspace. 47 / 50 What spacing is required between the door of a cabinet and live parts for systems over 250 volts (312.101(A)(3))? a. No specific requirement if the door is metallic. b. 1 1/2 inches (38 mm). c. 1 inch (25.4 mm). d. 1/2 inch (12.7 mm). Incorrect. Systems over 250 volts need at least 1 inch of airspace. Correct! The required airspace is 1 inch for higher voltage systems. For systems over 250 volts, a minimum airspace of 1 inch is required between live parts and the cabinet door. Grounding conductors are calculated differently from circuit conductors. 48 / 50 What volume allowance is required for a single equipment grounding conductor entering a box (314.16(B)(5))? a. One volume allowance based on the largest grounding conductor. b. A separate allowance for each grounding conductor. c. No allowance is required. d. Half the volume allowance of the largest conductor. Incorrect. Only one volume allowance is required for grounding conductors. Correct! One allowance is made for grounding conductors. A single volume allowance is required for equipment grounding conductors, based on the largest grounding conductor entering the box. Adequate space prevents overheating and damage. 49 / 50 What is the purpose of the box fill calculation (314.16)? a. To verify grounding continuity. b. To calculate the allowable current per circuit. c. To ensure the box provides enough free space for conductors and devices. d. To determine the maximum conductor length. Incorrect. Box fill calculations focus on free space for safety and performance. Correct! Box fill ensures proper space allocation for conductors and devices. Box fill calculations ensure that the enclosure has sufficient space for all contained conductors, devices, and fittings to avoid crowding and potential overheating. Refer to the specific table for wire-bending spaces. 50 / 50 What is the minimum wire-bending space at terminals for a 1/0 AWG conductor (Table 312.6(A))? a. 4 inches. b. 4 inches. c. 3 inches. d. 3 1/2 inches. Incorrect. Check the table for the correct bending space for 1/0 AWG conductors. Correct! The minimum bending space is 3 inches for 1/0 AWG conductors. The minimum wire-bending space at terminals for a 1/0 AWG conductor is 3 inches as per Table 312.6(A). Your score is LinkedIn Facebook Twitter 0% Restart quiz Exit Rate & Review Thank you for taking the time to leave us a review! Your feedback is greatly appreciated and helps us improve our services. Send feedback Leave a Reply Cancel replyYour email address will not be published. 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