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 Part03 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. Auxiliary gutters are strictly for wiring purposes. 1 / 50 Where are auxiliary gutters prohibited from being used (366.12)? a. In wet locations. b. For outdoor applications. c. To enclose switches, overcurrent devices, or appliances. d. In dry locations. Incorrect. Auxiliary gutters cannot house switches, overcurrent devices, or appliances. Correct! Auxiliary gutters are for wiring and not for housing devices. Auxiliary gutters cannot be used to enclose switches, overcurrent devices, or appliances, as they are solely intended for providing additional wiring space. Minimum trade sizes are standard across most conduit types. 2 / 50 What is the minimum trade size allowed for ENT (362.20(A))? a. Trade Size 3/4. b. Trade Size 3/8. c. No size restriction applies. d. Trade Size 1/2 (Metric Designator 16). Incorrect. The smallest allowable size for ENT is Trade Size 1/2. Correct! Trade Size 1/2 is the minimum size for ENT. The NEC specifies Trade Size 1/2 (Metric Designator 16) as the minimum trade size for ENT, ensuring mechanical integrity and compliance. Proper end preparation prevents conductor damage. 3 / 50 What must be done to ENT ends after cutting (362.28)? a. Trimmed inside and outside to remove rough edges. b. Sealed with tape. c. No preparation is necessary. d. Left as cut if smooth. Incorrect. ENT ends must always be trimmed to remove rough edges. Correct! Trimming ensures conductors are protected from abrasion. ENT ends must be trimmed inside and outside to remove rough edges, ensuring safe installation of conductors. EMT is highly versatile with certain limitations. 4 / 50 Where is EMT permitted to be installed (358.10)? a. Only in dry locations. b. Only in outdoor installations. c. In hazardous locations exclusively. d. In exposed, concealed, wet, or dry locations with appropriate fittings. Incorrect. EMT is versatile but must meet fitting and protection requirements. Correct! EMT is suitable for exposed, concealed, wet, or dry locations. EMT can be installed in exposed, concealed, wet, or dry locations when properly fitted and protected against corrosion as needed. Excessive bends make pulling conductors difficult. 5 / 50 What is the maximum allowable degree of bends in a single run of NUCC (354.24(B))? a. 360 degrees. b. 180 degrees. c. 540 degrees. d. No limit if pull points are used. Incorrect. The NEC limits the total degree of bends to 360. Correct! The limit is 360 degrees for bends in a single run. The total allowable degrees of bends in a single run of NUCC is limited to 360 degrees to prevent excessive pulling tension. LFNC is restricted in environments where physical durability is a concern. 6 / 50 Where is the use of LFNC prohibited (356.12)? a. For motor lead enclosures. b. In exposed locations. c. In hazardous locations unless specifically permitted and where subject to physical damage. d. For outdoor locations. Incorrect. LFNC is restricted from these environments without specific permission. Correct! These restrictions ensure LFNC is used safely. LFNC is not permitted in hazardous locations (unless specifically allowed) or areas where it would be subject to physical damage, ensuring safety and compliance. Trade sizes for HDPE conduit have defined upper limits. 7 / 50 What is the maximum allowable trade size for HDPE conduit (353.20(B))? a. Trade Size 6 (Metric Designator 155). b. No maximum size is specified. c. Trade Size 5. d. Trade Size 4. Incorrect. The largest allowable size for HDPE conduit is Trade Size 6. Correct! The maximum allowable size for HDPE conduit is Trade Size 6. HDPE conduit larger than Metric Designator 155 (Trade Size 6) is not permitted, ensuring compatibility with NEC standards. Outdoor exposure requires specific protection. 8 / 50 What marking is required on ENT for use in outdoor applications (362.120)? a. No special marking is required. b. Waterproof for all outdoor applications. c. Flame-retardant. d. Marking indicating sunlight resistance if exposed to direct sunlight. Incorrect. Sunlight-resistant marking is required for outdoor ENT installations. Correct! ENT must be marked for sunlight resistance in outdoor applications. ENT used in outdoor applications must be marked as sunlight-resistant if it will be exposed to direct sunlight. Proper support is necessary to maintain alignment and safety. 9 / 50 How must RTRC be secured near termination points (355.30(A))? a. No securing is required near termination points. b. Every 6 feet regardless of location. c. Within 3 feet (900 mm) of termination points. d. Only at midpoints between boxes. Incorrect. Securement is required within 3 feet of termination points Correct! RTRC must be secured within 3 feet of termination points. RTRC must be securely fastened within 3 feet (900 mm) of each termination point to ensure a stable and safe installation. Fixed bends require specific radii based on conduit size. 10 / 50 What is the minimum bending radius for FMT in fixed bends (360.24(B))? a. No bending radius is specified for fixed bends. b. Varies by trade size and is listed in Table 360.24(B). c. 10 times the diameter. d. 4 inches for all sizes. Incorrect. The bending radius varies by trade size and is specified in Table 360.24(B). Correct! The minimum radius depends on the trade size and is detailed in the NEC table. The minimum bending radius for FMT in fixed bends is specified by trade size in Table 360.24(B) to ensure proper installation and conduit integrity. Length limitations ensure stability without additional fastenings. 11 / 50 What is the maximum allowable length for LFNC without secure fastening (356.30)? a. 1.2 meters (4 feet). b. 3 meters (10 feet). c. 1.8 meters (6 feet). d. No length restriction applies. Incorrect. The maximum length for unsecured LFNC is 1.8 meters (6 feet). Correct! LFNC can be installed unsecured for up to 1.8 meters. LFNC can be installed without secure fastening for lengths up to 1.8 meters (6 feet) in applications where flexibility is required. ENT is not suitable for certain harsh environments. 12 / 50 Where is ENT prohibited from being used (362.12)? a. For direct earth burial. b. In residential buildings. c. In hazardous locations unless specifically allowed by other articles. d. In concealed locations. Incorrect. ENT cannot be used in hazardous locations without explicit NEC permission. Correct! ENT is not allowed in hazardous locations unless permitted. ENT is prohibited in hazardous locations unless explicitly permitted by other NEC articles, ensuring safety in such areas. EMT is not designed to withstand certain extreme conditions. 13 / 50 Where is the use of EMT prohibited (358.12)? a. Where subject to severe physical damage. b. In wet locations. c. In underground direct burial applications. d. For motor lead enclosures. Incorrect. EMT is prohibited in areas subject to severe physical damage. Correct! EMT is not allowed where severe physical damage may occur. EMT cannot be used in areas subject to severe physical damage, as it may not provide adequate mechanical protection in such environments. ENT is rated for specific temperature conditions. 14 / 50 What is the maximum ambient temperature for standard ENT installations (362.12(3))? a. 50°C (122°F), unless listed otherwise. b. 50°C (122°F). c. 60°C (140°F). d. 45°C (113°F). Incorrect. The maximum ambient temperature for standard ENT is 50°C unless listed otherwise. Correct! ENT is limited to 50°C unless listed for higher temperatures. Standard ENT cannot be used in ambient temperatures exceeding 50°C (122°F) unless specifically listed for higher temperatures. RTRC has a defined size limit for standard installations. 15 / 50 What is the maximum allowable trade size for RTRC (355.20(B))? a. Trade Size 4. b. Trade Size 6 (Metric Designator 155). c. Trade Size 5. d. No maximum size is specified. Incorrect. Trade Size 6 is the largest allowable size for RTRC. Correct! The maximum allowable size is Trade Size 6 (Metric Designator 155). The NEC specifies that RTRC larger than Metric Designator 155 (Trade Size 6) is not allowed, ensuring consistency with installation standards. Wet location installations require specific fittings. 16 / 50 What fittings must be used for EMT in wet locations (358.42)? a. Fittings made of nonmetallic materials. b. No fittings are required in wet locations. c. Threaded couplings only. d. Fittings compliant with 314.15 for wet environments. Incorrect. Wet locations require fittings compliant with 314.15. Correct! EMT fittings in wet locations must comply with NEC 314.15. EMT fittings used in wet locations must comply with 314.15, ensuring they are listed for wet use and provide adequate protection against moisture ingress. Auxiliary gutters are not raceways but serve a specific function for wiring. 17 / 50 What is the primary purpose of an auxiliary gutter (366.1)? a. To act as a primary raceway. b. To house switches and overcurrent devices. c. To provide additional wiring space for enclosures and equipment. d. To replace panelboards in larger systems. Incorrect. Auxiliary gutters are not used to house switches or overcurrent devices. Correct! Auxiliary gutters provide extra space for wiring in enclosures. Auxiliary gutters provide extra wiring space in enclosures to accommodate conductors or provide adequate bending and deflection space at terminals. Securing intervals maintain alignment and stability. 18 / 50 What is the required interval for securing ENT in horizontal runs (362.30)? a. Every 5 feet. b. Every 3 feet. c. Every 3 feet and within 3 feet of termination points. d. No specific interval is required. Incorrect. ENT must be fastened every 3 feet and near terminations. Correct! ENT requires fastening every 3 feet and at terminations. ENT must be securely fastened at intervals not exceeding 3 feet and within 3 feet of any termination points such as boxes or fittings. Joining methods ensure secure and compliant connections. 19 / 50 What is required for joining lengths of HDPE conduit (353.48)? a. Threaded joints only. b. Heat fusion, electrofusion, or mechanical fittings. c. No specific joining method is required. d. Standard adhesive tape. Incorrect. Joining must use approved methods like heat fusion or mechanical fittings. Correct! Approved joining methods ensure secure connections. HDPE conduit must be joined using approved methods such as heat fusion, electrofusion, or mechanical fittings to provide secure connections. Regular support intervals prevent sagging and ensure stability. 20 / 50 How often must sheet metal auxiliary gutters be supported and secured (366.30(A))? a. Only at termination points. b. Every 5 feet. c. Every 3 feet. d. Every 10 feet. Incorrect. The support interval for sheet metal auxiliary gutters is 5 feet. Correct! Sheet metal auxiliary gutters must be secured every 5 feet. Sheet metal auxiliary gutters must be supported and secured at intervals not exceeding 5 feet to ensure proper alignment and stability. FMT is restricted to short lengths for safety and performance. 21 / 50 What is the maximum allowable length for FMT (360.12)? a. 10 feet (3 meters). b. 15 feet (4.5 meters). c. 6 feet (1.8 meters). d. No length limit applies. Incorrect. The maximum length for FMT is 6 feet (1.8 meters). Correct! FMT is limited to 6 feet in length. FMT is limited to a maximum length of 6 feet (1.8 meters) to maintain its flexibility and compliance with NEC standards. The maximum extension length is specified except for specific exceptions. 22 / 50 What is the maximum distance an auxiliary gutter can extend beyond the equipment it supplements (366.10(C))? a. No distance limitation. b. 15 feet. c. 30 feet. d. 50 feet. Incorrect. The maximum allowed distance is 30 feet. Correct! The extension limit is 30 feet for auxiliary gutters. Auxiliary gutters may extend up to 30 feet beyond the equipment they supplement unless specifically permitted otherwise (e.g., for elevators under 620.35). Splices and taps must follow standard NEC guidelines. 23 / 50 How must splices and taps be made when using FMT (360.56)? a. In an approved junction box or enclosure. b. No specific requirements exist for splices or taps. c. In accordance with 300.15, requiring boxes or fittings. d. Using electrical tape only. Incorrect. Splices and taps must comply with NEC 300.15 requirements. Correct! Splices and taps must adhere to NEC standards for safety. Splices and taps in FMT installations must comply with NEC 300.15, requiring the use of approved boxes or fittings to maintain safety and system integrity Use in taller buildings requires specific safety measures. 24 / 50 Where is ENT permitted to be used in buildings exceeding three floors (362.10(2))? a. In walls, floors, and ceilings without restrictions. b. Only in fire-rated buildings. c. In exposed locations only. d. Concealed within walls, floors, and ceilings with a 15-minute thermal barrier. Incorrect. ENT use in such buildings is restricted to concealed areas with thermal barriers. Correct! A 15-minute thermal barrier is required for use in buildings over three floors. ENT can be installed in buildings exceeding three floors only if concealed within walls, floors, and ceilings that have at least a 15-minute thermal barrier. EMT must provide durability and environmental resistance. 25 / 50 What materials are allowed for constructing EMT (358.100)? a. Nonmetallic materials only. b. Plastic-coated metal. c. Copper and stainless steel. d. Steel, aluminum, or stainless steel with protective coatings. Incorrect. EMT is made of steel, aluminum, or stainless steel with protective coatings. Correct! These materials meet the construction specifications for EMT. EMT can be constructed from steel, aluminum, or stainless steel with protective coatings, ensuring suitability for various applications. Smaller sizes are not suitable for NUCC installations. 26 / 50 What is the minimum trade size allowed for NUCC (354.20(A))? a. Metric Designator 13 (Trade Size 3/8). b. Metric Designator 27 (Trade Size 1). c. Metric Designator 21 (Trade Size 3/4). d. Metric Designator 16 (Trade Size 1/2). Incorrect. The smallest allowable trade size is Metric Designator 16. Correct! The minimum trade size is Metric Designator 16 (Trade Size 1/2). NUCC smaller than Metric Designator 16 (Trade Size 1/2) is not permitted, ensuring adequate space and mechanical integrity. Excessive bending hinders conductor installation. 27 / 50 What is the maximum total degree of bends allowed in a single EMT run (358.24(B))? a. 180 degrees. b. 540 degrees. c. 360 degrees. d. No limit applies. Incorrect. The total allowable bending is limited to 360 degrees. Correct! The limit is 360 degrees in a single run of EMT. EMT runs must not exceed 360 degrees of bends between pull points to ensure ease of conductor installation and system integrity. Protection is necessary at termination points to avoid damage. 28 / 50 What must be provided at conduit ends where NUCC enters a box or fitting (354.46)? a. Electrical tape. b. No protection is required. c. A bushing or adapter to protect conductors from abrasion. d. A plastic cap. Incorrect. Bushings or adapters are required for conductor protection. Correct! Bushings or adapters ensure conductors are protected from abrasion. A bushing or adapter must be installed to protect the conductors from abrasion at the point where NUCC enters a box or fitting. HDPE conduit is designed for specific outdoor and underground applications. 29 / 50 In what locations is HDPE conduit not permitted (353.12)? a. Underground installations. b. For direct burial. c. For use in wet locations. d. Where exposed or within a building. Incorrect. HDPE conduit is not allowed in exposed locations or within buildings. Correct! HDPE conduit is restricted from these locations. HDPE conduit cannot be used where exposed, within a building, or in hazardous locations unless otherwise permitted, as it is not designed for these environments. Certain environments and conditions restrict PVC conduit use. 30 / 50 Where is PVC conduit not permitted for use (352.12)? a. In hazardous locations unless specifically allowed. b. For supporting luminaires. c. In underground installations. d. In dry locations. Incorrect. Hazardous locations are restricted unless explicitly permitted. Correct! PVC conduit is not allowed in hazardous locations unless permitted. PVC conduit is not permitted in hazardous locations unless specifically allowed by other articles in the NEC to ensure safety and compliance. Marking ensures identification and proper use. 31 / 50 How often must EMT be marked along its length (358.120)? a. Marking is required only at terminations. b. Every 5 feet. c. Every 2 feet. d. Every 10 feet (3 meters). Incorrect. EMT marking is required every 10 feet for proper identification. Correct! EMT must be marked at least every 10 feet. EMT must be clearly and durably marked at least every 10 feet (3 meters), as specified by NEC requirements. Larger sizes have specific NEC restrictions. 32 / 50 What is the maximum trade size allowed for ENT (362.20(B))? a. Trade Size 2. b. Trade Size 2 1/2 (Metric Designator 63). c. Trade Size 3. d. Trade Size 4. Incorrect. Trade Size 2 1/2 is the maximum allowable size for ENT. Correct! The largest size for ENT is Trade Size 2 1/2. The NEC limits ENT to a maximum trade size of 2 1/2 (Metric Designator 63) to maintain mechanical integrity and compliance. FMT is restricted in certain hazardous or mechanically demanding environments. 33 / 50 Where is FMT prohibited from being installed (360.12)? a. For branch circuits in residential buildings. b. In hoistways, storage battery rooms, or hazardous locations unless permitted by other articles. c. In dry locations. d. For low-voltage applications. Incorrect. These locations are specifically prohibited for FMT installations. Correct! FMT is not permitted in these environments unless explicitly allowed. FMT cannot be installed in hoistways, storage battery rooms, hazardous locations, or where subject to physical damage, unless specifically allowed by other NEC articles. Proper preparation prevents damage to conductors. 34 / 50 How must the ends of LFNC be prepared after cutting (356.28)? a. Trimmed inside and outside to remove rough edges. b. Left as cut if smooth. c. Covered with tape. d. Sealed with a heat-shrink cap. Incorrect. Ends must be properly trimmed to remove rough edges. Correct! Trimming ensures conductors are not damaged. Cut ends of LFNC must be trimmed inside and outside to remove rough edges and prevent abrasion or damage to conductors. FMT has standard minimum sizing for general applications. 35 / 50 What is the minimum trade size for FMT (360.20(A))? a. Trade Size 1 (Metric Designator 27). b. Trade Size 3/8 (Metric Designator 12). c. Trade Size 1/2 (Metric Designator 16). d. Trade Size 3/4 (Metric Designator 21). Incorrect. The standard minimum trade size for FMT is 1/2 inch (Metric Designator 16). Correct! The minimum trade size for FMT is 1/2 inch. The minimum trade size for FMT is 1/2 inch (Metric Designator 16), except in specific applications where 3/8 inch is permitted. NUCC is designed specifically for underground applications. 36 / 50 Where is NUCC prohibited from being installed (354.12)? a. In damp or wet locations. b. In exposed locations or inside buildings, except for termination purposes. c. Encased in concrete. d. In underground installations. Incorrect. NUCC is not suitable for exposed locations or inside buildings unless for terminations. Correct! NUCC is restricted to underground and concealed applications. NUCC cannot be used in exposed locations or inside buildings unless for termination purposes in accordance with 300.3. Excessive bends can make conductor installation difficult. 37 / 50 What is the total maximum degrees of bends allowed in a single run of ENT (362.24(B))? a. No limit applies. b. 360 degrees. c. 180 degrees. d. 540 degrees. Incorrect. The maximum allowable degree of bends is 360 degrees. Correct! ENT is limited to 360 degrees of bends in a single run. The total degrees of bends in a single run of ENT must not exceed 360 degrees to ensure ease of conductor installation and system integrity. Marking ensures suitability and compliance for specific environments. 38 / 50 What marking is required on LFNC for outdoor or direct burial applications (356.120)? a. No marking is required for outdoor applications. b. Marking at the ends of each reel. c. Marking indicating suitability for outdoor use or direct burial. d. Flame-retardant only. Incorrect. The marking must indicate outdoor or burial suitability for these applications. Correct! LFNC must be marked for outdoor or direct burial use as appropriate. LFNC must be marked to indicate its suitability for outdoor use or direct burial if used in such applications, ensuring proper usage. Securement intervals ensure system stability 39 / 50 How must EMT be secured and supported (358.30)? a. Every 3 feet for concealed work. b. Only at junction boxes or outlets. c. Every 6 feet along its length. d. Within 3 feet of termination points and at intervals not exceeding 10 feet. Incorrect. EMT requires support at these specified intervals. Correct! EMT must be secured within 3 feet of terminations and supported every 10 feet. EMT must be secured within 3 feet of each termination point and supported at intervals not exceeding 10 feet to maintain alignment and prevent sagging. RTRC use in hazardous environments is tightly controlled. 40 / 50 Where is RTRC not permitted to be installed (355.12)? a. In underground installations. b. In hazardous (classified) locations unless specifically permitted. c. In wet locations. d. In corrosive environments. Incorrect. RTRC is restricted in hazardous locations unless specifically permitted. Correct! RTRC cannot be installed in hazardous locations without explicit permission. RTRC is not permitted in hazardous locations unless explicitly allowed by other NEC articles, ensuring safety in classified areas. NEC standards require specific enclosures for splices and taps. 41 / 50 How must splices and taps be made in ENT (362.56)? a. By wrapping conductors with electrical tape. b. In accordance with 300.15, requiring an approved box or fitting. c. Using wire nuts directly within the tubing. d. No specific requirements for splices and taps. Incorrect. Splices and taps require an approved box or fitting. Correct! NEC 300.15 specifies the use of an approved enclosure for splices and taps. Splices and taps in ENT must comply with NEC 300.15, requiring that they be made in an approved box or fitting for safety. Regular marking ensures compliance and easy identification during installation. 42 / 50 How often must RTRC be marked along its length (355.120)? a. Marking is required only at the ends of each reel. b. Every 20 feet. c. Every 2 meters (6 feet). d. Every 10 feet (3 meters). Incorrect. The marking interval is every 10 feet (3 meters). Correct! RTRC must be marked every 10 feet for identification. RTRC must be clearly and durably marked at least every 10 feet (3 meters) for proper identification and compliance with NEC standards. The NEC defines a standard minimum size for EMT. 43 / 50 What is the minimum trade size for EMT (358.20(A))? a. Trade Size 1/4. b. Trade Size 1. c. Trade Size 3/8 (Metric Designator 12). d. Trade Size 1/2 (Metric Designator 16). Incorrect. The standard minimum trade size is Trade Size 1/2. Correct! The minimum trade size for EMT is Trade Size 1/2. The minimum allowable trade size for EMT is Trade Size 1/2 (Metric Designator 16), except for specific motor lead applications where Trade Size 3/8 is allowed. LFNC is designed for flexibility and diverse environmental conditions. 44 / 50 Where is LFNC permitted to be installed (356.10)? a. Only in dry locations. b. Underground exclusively. c. Only in hazardous locations. d. In exposed or concealed locations, wet areas, and direct burial if listed for such use. Incorrect. LFNC has versatile applications in both exposed and concealed locations when properly listed. Correct! LFNC is versatile and can be used in these specified environments. LFNC can be installed in exposed or concealed locations, wet areas, or underground if it is listed for direct burial or outdoor use. Proper preparation prevents conductor damage. 45 / 50 How must EMT ends be treated after cutting (358.28(A))? a. Covered with tape. b. Threaded for all installations. c. Left as cut if smooth. d. Reamed or finished to remove rough edges. Incorrect. Ends must be reamed or finished to remove rough edges. Correct! Reaming ensures conductors are not damaged. All cut ends of EMT must be reamed or finished to remove burrs or rough edges, protecting conductors during installation. This percentage ensures adequate space for wiring and cooling. 46 / 50 What percentage of the interior cross-sectional area of an auxiliary gutter can be occupied by conductors (366.22)? a. 50%. b. 30%. c. 20% d. 10%. Incorrect. The maximum allowable fill is 20%. Correct! Conductors can occupy up to 20% of the gutter’s interior area. The total cross-sectional area of conductors in an auxiliary gutter cannot exceed 20% of the interior cross-sectional area to maintain space for heat dissipation and wiring integrity. Regular marking ensures easy identification during installation. 47 / 50 How often must NUCC be marked along its length (354.120)? a. Every 2 meters (6 feet). b. Every 3.05 meters (10 feet). c. Every 15 meters (50 feet). d. Only at the ends of each reel. Incorrect. The marking interval for NUCC is 3.05 meters (10 feet). Correct! NUCC must be marked every 10 feet for identification. NUCC must be clearly and durably marked at least every 3.05 meters (10 feet) to comply with NEC requirements. Wet locations require materials resistant to environmental degradation. 48 / 50 What materials must be used for bolts, straps, and screws supporting EMT in wet locations (358.10(D))? a. Nonmetallic materials. b. Corrosion-resistant materials or materials with corrosion protection. c. Standard steel. d. Galvanized steel only. Incorrect. Wet locations demand corrosion-resistant or protected materials. Correct! Corrosion-resistant or protected materials are required for wet locations. All supports and fasteners in wet locations must be made of corrosion-resistant materials or materials protected against corrosion to maintain durability. Continuous plug-in busways have specific current limitations. 49 / 50 What is the maximum current rating for continuous plug-in busways (368.1)? a. 225 amperes. b. No limit applies. c. 300 amperes. d. 50 amperes. Incorrect. The maximum current rating for continuous plug-in busways is 225 amperes. Correct! The maximum rating for continuous plug-in busways is 225 amperes. Continuous plug-in busways are limited to a maximum current rating of 225 amperes to ensure safe operation and compliance with NEC standards. Protection at entry points prevents damage to conductors. 50 / 50 What is required to protect conductors where RTRC enters a box or fitting (355.46)? a. A plastic cap. b. Electrical tape. c. No protection is needed. d. A bushing or adapter to prevent abrasion. Incorrect. Bushings or adapters are mandatory to protect conductors. Correct! Bushings or adapters ensure conductor protection. A bushing or adapter is required to protect conductors from abrasion where RTRC enters a box or fitting. Your score is LinkedIn Facebook Twitter 0% Restart quiz Exit Rate & Review Thank you for taking the time to leave us a review! 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