National Electrical Code (NEC) Article 314 Practice Test

These questions are part of the practice quiz. Start practicing

• How should boxes be installed in relation to structural members?
• In a 4 in. × 4 in. × 1 1/2 in. box, what is the maximum number of 12 AWG THWN-2 conductors allowed?
• What factors must be considered when determining the need for additional space in an electrical box?
• What is required for box sharing according to NEC Article 314?
• Why must boxes be securely fastened?
• Can a box serve as a support for other equipment?
• What is the requirement for screws entering the wall of a conduit body?
• What is the typical range for mounting heights of outlet boxes?
• What is the requirement for free space around a box?
• How should the bonding and grounding of boxes be addressed in Article 314?
• What is the total volume occupied by two internal cable clamps, six 12 AWG conductors, and a single-pole switch?
• In noncombustible walls or ceilings, how far shall the front edge of a box set back from the finished surface?
• What is the purpose of a cover on an electrical box?
• An outlet box or enclosure mounted on a surface must be:
• Which wiring methods can affect box fill calculations?
• Nonmetallic boxes are permitted to be used with which of the following?
• What consideration is necessary for the installation of boxes in hazardous locations?
• What type of box would most likely be installed for outdoor lighting fixtures?
• Which type of device would most likely be installed within a ceiling box?
• What is NOT required for underground raceways and cable assemblies entering a handhole enclosure?
• What is the minimum depth requirement for outlet boxes mounted in a wall?
• What is the requirement for cable clamps in boxes?
• What are the minimum box volume requirements for a switch or device box?
• What is a crucial safety tip when working with electrical boxes?
• What is the maximum weight for a luminaire that can be supported by an outlet box specifically listed for its weight?
• When is it acceptable to use flexible conduits with boxes?
• What is the minimum cross-section of a wood brace used for supporting a box for structural mounting?
• Are there specific requirements for burial boxes in electrical installations?
• What is the importance of proper sealing in outdoor boxes?
• For junction boxes exceeding 100 cu in., how far must screws penetrate the wall?
• What is the maximum number of conductors allowed in a box determined by?
• How much weight must boxes used at luminaire or lampholder outlets in a ceiling be designed to support?
• What is a "junction box"?
• In installations not exceeding 100 cu in., what is the requirement for screws entering wiring spaces?
• What is the maximum distance for screw penetration within a junction box wall adjacent to a cabinet?
• What does Article 314 require for through-the-wall box installation?
• How does the NEC dictate the counting of devices or utilization equipment in a box wider than a single device box?
• What is the allowed maximum height for mounting an outlet box for accessibility?
• Which box type is essential for meeting service entry regulations?
• How must boxes be identified in a dwelling unit?
• What is the minimum depth requirement for certain electrical boxes?
• What is the primary function of a handhole enclosure?
• Outlet boxes can be secured to suspended-ceiling framing members by which of the following methods?
• In a wet location, to accommodate three conductors entering a pull box, what must be considered?
• Which of the following is a requirement for screws penetrating the box walls in a junction box?
• What does Article 314 primarily address?
• What is a key requirement for ceiling fan boxes?
• When are boxes required to be accessible according to NEC Article 314?
• What is the minimum depth required for a pull box in a wet location with a 3½ in. raceway?
• Which guideline must be followed for box installations in ceilings?
• How is box fill affected by switch installation?
• What is the maximum luminaire weight indication required to be marked on the interior of luminaires' outlet boxes?
• Accessible underground raceways must meet specific criteria to be in compliance. What is a critical component to be considered?
• What is recommended for the labeling of boxes in dwellings?
• Which component is essential for ensuring the safety of electrical installations?
• What should be included when calculating space in a box for conductors?
• Which kind of boxes are allowed in damp locations?
• What role do raceways play in conjunction with boxes?
• What type of fastening is required for an outlet box?
• What is a device box?
• How does Article 314 handle splices within boxes?
• What should be used to ensure moisture protection for electrical boxes?
• What is an open box used for?
• Utility boxes are critical in which of the following scenarios?
• When installing fasteners in wiring spaces of fittings, which is a key requirement?
• What aspect distinguishes utility boxes from accessory boxes?
• For cable assemblies with nonmetallic sheaths, how far must the sheath extend inside the box beyond any cable clamp?
• How should electrical modifications be approached for safety?
• What is an important consideration when installing multi-gang boxes?
• A pendant box must be supported by a multiconductor cord or cable in a manner that protects the conductors against what?
• How far must each raceway be supported within an outlet box for the box to be considered supported?
• In terms of quantity, how many equipment grounding conductors can enter a box without requiring additional volume allowance?
• In what position can electrical boxes be installed?
• In terms of installation, accessory boxes are most likely to support which function?
• How is the volume of a conductor determined for box fill calculations?
• Which type of box must be used for outdoor installations to protect against moisture?
• Which material is commonly used for non-metallic boxes?
• What is a “gang box”?
• What is meant by flush installation of boxes in walls?
• A device or utilization equipment wider than a single 2 in. device box shall have what volume allowance provided for each gang required for mounting?
• What materials are commonly used to make electrical boxes?
• What is the typical height requirement for outlet boxes in living spaces?
• What type of box is typically used for raceway entries?
• What should be verified when servicing any junction or pull box?
• What must be provided between all entries when using nonmetallic boxes with metal raceways or metal-armored cables?
• What is the minimum working space required around electrical boxes?
• Screws that are longer than specified may be used if they are protected with what type of means?
• What types of boxes are recommended for use in low-voltage applications?
• Which of the following is true regarding the use of accessory boxes?
• Which type of floor boxes must be used for receptacles located in the floor?
• What factors must be considered when determining the volume of a box?
• What does NEC Article 314 require about the height of service boxes?
• In residential wiring, utility boxes are primarily used for what purpose?
• What feature do outdoor electrical boxes commonly have to ensure safety?
• In a conduit body, what is the requirement regarding the free space for conductors?
• What is the primary purpose of Article 314 in the NEC?
• Which type of box is primarily designed for protection against electrical faults?
• What should be considered when using boxes in high-traffic areas?
• What is the minimum distance from the raceway entry to the opposite wall of a pull or junction box for a U pull with two 3-in. raceways?
• What materials are burial boxes specifically rated to handle?
• What are listed or labeled boxes?
• Which type of box is more associated with network connections and splicing?
• What is a requirement for outdoor boxes under the NEC?
• Why are screws or bolts essential in electrical box installations?
• What characteristics must boxes located in wet areas possess?
• In which scenarios are non-metallic boxes prohibited?
• What is the maximum volume for a standard 4-inch round box?
• In addition to proper volume calculations, what is critical for box installations?
• What defines a single-gang box?
• How many smaller fixture wires, less than 14 AWG, are permitted to be omitted from calculations in a box?
• Handhole enclosures must be designed to withstand which of the following?
• Can an electrical box be mounted on a wall without any support?
• Are there specific requirements for conduits entering boxes?
• How many 12 AWG conductors can be accommodated in a metal box sized 3.75 in. x 2 in. x 3.5 in.?
• Conductors, splices, or terminations in a handhole enclosure should be suitable for which type of locations?
• What is required for a conduit body that contains splices or taps?
• What is the maximum height of pull boxes or junction boxes that requires all conductors to be cabled or racked in an approved manner?
• What does “box fill” refer to in the context of electrical installations?
• Which requirement must be met for a box that contains a splice?
• Which type of attachment fitting must be used with a box equipped with a hub for a pendant box?
• When a raceway entry is in the wall of a box opposite a removable cover, the distance to the cover must comply with the distance required for how many wire(s) per terminal?
• Utility boxes are typically used for which of the following?
• Are flush-mounted boxes required to be mounted flush with the wall?
• What is the primary purpose of boxes and conduit bodies according to the NEC?
• When selecting the size for outlet boxes that will support ceiling fans, what criteria should be primarily considered?
• What is the primary requirement for box supports according to Article 314?
• What should be done if the number of conductors exceeds box fill limitations?
• In combustible surfaces, boxes and other fixtures shall extend to what location?
• What is the rule for box fill when using conductors insulated with different materials?
• What does NEC Article 314 primarily address?
• When up to four equipment grounding conductors enter a box, what volume allowance shall be made based on the largest equipment grounding conductor?
• What does Article 314 require regarding box dimensions?
• What is the requirement for equipment that weighs not more than 6 lb to be supported to any box?
• What is required for the installation of underground boxes according to NEC guidelines?
• What is the maximum number of conductors allowed in a single box?
• Which material must be avoided when describing the condition of handhole enclosures?
• Which type of underground structures must be installed to ensure accessibility without excavation?
• What is a potential consequence of not providing enough space in an electrical box?
• What is a common feature expected of cable clamps in boxes?
• How is box fill recalculated when adding a device to an existing box?
• What is required when performing box fill calculations?
• Which type of cable is specified when identifying the maximum number of conductors in a box?
• Are there minimum spacing requirements for boxes in a run of wire?
• What impact does installing multiple devices in a single box have on box fill calculations?
• Can nonmetallic boxes be used in wet locations?
• What is the maximum weight of a vertically mounted luminaire that can be supported to a device box or plaster ring?
• What is a “pull box” used for?
• Which of the following is necessary for a box to be considered able to support an outlet box containing devices or luminaires?
• What is the recommended way to support a non-metallic box?
• In hazardous locations, what must be true about the boxes used?
• What is the maximum gap allowed around boxes employing a flush-type cover in noncombustible surfaces?
• What ensures that utility boxes comply with regulations?
• When counting the number of conductors in a box, how is a conductor running through the box with an unbroken loop counted?
• The distance between each raceway entry inside a box and the opposite wall must not be less than how many times the trade size of the largest raceway during splices or pulls?
• In accordance with Article 250, metal boxes must be:
• How many conduits must be threaded wrenchtight into an enclosure for it to be considered supported if it is not over 100 cu in.?
• Why must underground raceways and cable assemblies extend into handhole enclosures?
• Can nonmetallic boxes be used with metal conduits?
• For luminaires, what is the volume allowance made for each type of fitting inside a box?
• What is required for sealing a box effectively against moisture?
• How should abandoned boxes be handled according to the code?
• Which factor is NOT considered in calculating box fill?
• Is it permissible to locate an outlet box under a window?
• Are brackets required for supporting ceiling boxes?
• What defines the function of an open box?
• What is required for the installation of outdoor electrical boxes?
• Which type of box can be used to contain a single switch?
• Handhole enclosure covers must require the use of tools to open OR weigh over what minimum weight?
• What is the maximum penetration allowed for screws attaching covers in outlet and device boxes?
• How can you determine the correct box size for a specific installation?
• According to the regulations, metal braces used for box support must be protected against what?
• Are metal boxes required to be grounded?
• Where should support wires used for enclosure support in suspended ceilings be fastened?
• What does the NEC specify regarding the installation of internal cable clamps in a box?
• Can underfloor boxes be used without covers?
• When securing an enclosure to a finished surface, how must it be secured?
• Accessory boxes are predominantly used for which of the following devices?
• When should handholes be installed in a cable system?
• Where are burial boxes typically installed?
• What primary role do junction boxes play in electrical systems?
• How is volume calculated for multi-gang boxes?
• How far must the sheath of a nonmetallic cable assembly extend beyond the cable clamp inside the box?
• Under what conditions can junction boxes be left accessible in a building?
• What is the primary function of a weatherproof cover?
• Does NEC Article 314 provide guidelines for ceiling-mounted box installations?
• Which type of installation is NOT permitted for non-metallic boxes?
• What is the primary purpose of a junction box?
• When using extension rings, what must be done with noncombustible surfaces?
• What are "nail-on" boxes designed for?
• What is the minimum screw size required to secure equipment weighing 6 lb to a box?
• Conduit bodies that are durably and legibly marked by the manufacturer must indicate what to contain splices, taps, or devices?
• What is the primary purpose of accessory boxes in electrical installations?
• What type of outlet boxes must be listed for the future installation of a ceiling-suspended fan in a habitable room?
• What type of inspections must be conducted on accessible junction boxes?
• Which Article governs the installation and use of all boxes and conduit bodies used as outlet, device, junction, or pull boxes?
• What limitation exists regarding shared boxes?
• Which of the following is a critical factor when determining box fill?
• What is the requirement for insulating bushings when using conduit?
• For outlet boxes containing devices or luminaires, what is the maximum weight that must be supported by the box?
• How many conductors can a standard 4-inch square box accommodate?
• What does NEC stand for in electrical regulations?
• What type of identifying mark should handhole enclosure covers have?
• Does NEC Article 314 allow for box sharing between circuits?
• For what reason must boxes be accessible for maintenance?
• What does "box fill calculation" involve under Article 314?
• Can non-metallic boxes be used with metallic devices?
• What is the total volume of a 3 in. × 2 in. × 2 in. device box for conductor fill?
• Are there regulations concerning box placement near doorways?
• For a pull box in a straight pull of 2-in. raceways, the length of the pull box must be a minimum of how many times the trade diameter?
• What is a remodel box?
• Outlet boxes designed to support ceiling-suspended fans weighing more than what should have a maximum weight marked on the box?
• What is the purpose of a handhole in electrical installations?
• What type of boxes are required for wet locations according to Article 314?
• What is the basis for volume allowance when internal cable clamps are present in the box?
• When considering electrical boxes, which type would be used for in-wall wiring connections?
• What are the requirements for outdoor box installations?
• What is the advantage of having covers that require tools to open for handhole enclosures?
• What is the main purpose of using insulating bushings in conduit installations?
• Which of the following conditions applies to outlet boxes that are to support ceiling-suspended paddle fans?
• What is a common issue with improper box installation?
• Which wiring method can necessitate the use of an electrical box?
• Can PVC boxes be used with metallic conduit?
• For what purpose would you typically use an accessory box?
• For a pull box that serves a straight pull of 2-inch raceways, which measurement is crucial for ensuring compliance?
• What kind of safety measures should be taken for abandoned boxes?
• Should all junction boxes be labeled for identification?
• What type of screws must be used to support a vertically mounted luminaire weighing not more than 6 lbs?
• What should you do if a junction box is located in a hard-to-reach place?
• What must be calculated when using multi-gang boxes for installation?
• What is an outlet box designed for?
• Are there limitations on the use of underwater electrical boxes?
• What factor contributes to the required number of volume allowances in a box containing fixtures and devices?
• What does Article 314 say about the installation of boxes in finished walls?
• How must surface extensions be secured over the box?
• How much volume should be added when installing a device in a box?
• Why are raceways important in electrical installations?
• Under Article 314, what is a "pull box"?
• What defines a weatherproof box according to Article 314?
• What factor influences the box fill calculation besides conductor volume?
• Can a box be used as a junction point for circuits with different ratings?
• What is a double gang box?
• What do volume allowances in box calculations account for?
• What is a primary feature that must be included in the design of handhole enclosures?
• Screws or fasteners that are installed in outlet and device boxes must have what characteristic regarding their ends?
• Which type of box is specifically designed to support lighting fixtures?
• How does the NEC address the modification of existing boxes?