NEC Flashcards 2017
What is the approximate diameter, on No. 2 RHW wire in inches?
0.472 2017 NEC - Chapter 9 Tables Table 5 Dimensions of Insulated Conductors and Fixture Wires (page 70-684)
For permanently connected appliances rated at not over_______ horsepower, the branchcircuit overcurrent device shall be permitted to serve as the disconnecting means.
1/8 For permanently connected appliances rated at not over 300 volt-amperes or 1/8 hp, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is lockable in accordance with 110.25. 2017 NEC 422.31(A) Rated at Not over 300 Volt-Amperes or 1/8 Horsepower.
A legally required standby system must have rating and capacity sufficient for how much of the loads expected to operate at the same time on the standby system?
100% of the loads A legally required standby system shall have adequate capacity and rating for the supply of all equipment intended to be operated at one time. Legally required standby system equipment shall be suitable for the maximum available fault current at its terminals. 2017 NEC - 701.4 Capacity and Rating.
The length of cord for built-in dishwashers shall not be less than_______ feet.
3 feet (3) For a built-in dishwasher, the length of the cord shall be 0.9 m to 2.0 m (3 ft to 6.5 ft) measured from the face of the attachment plug to the plane of the rear of the appliance. 2017 NEC 422.16(B)(2) Built-in Dishwashers and Trash Compactors.
Thermal insulation shall not be installed above a recessed luminaire (fixture) or within _______ of the recessed luminaires (fixtures) enclosure, wiring compartment, or ballast unless it is identified for contact with insulation, Type IC.
3 inches Thermal insulation shall not be installed above a recessed luminaire or within 75 mm (3 in.) of the recessed luminaire's enclosure, wiring compartment, ballast, transformer, LED driver, or power supply unless the luminaire is identified as Type IC for insulation contact. 2017 NEC 410.116(B) Installation.
What is the maximum number of amps that a branch-circuit supplying a neon tubing installation should have?
30 amperes Branch circuits that supply neon tubing installations shall not be rated in excess of 30 amperes. 2017 NEC 600.5(B)(1) Neon Signs.
The length of cord for trash compactors shall not be over______ feet.
4 feet (2) For a trash compactor, the length of the cord shall be 0.9 m to 1.2 m (3 ft to 4 ft) measured from the face of the attachment plug to the plane of the rear of the appliance. 2017 NEC - 422.16(B)(2) Built-in Dishwashers and Trash Compactors.
Flexible metal conduit or liquidtight flexible metal conduit not exceeding _______ in length shall be permitted to be employed for raceway connection to a motor terminal enclosure.
6 feet Flexible metal conduit or liquidtight flexible metal conduit not exceeding 1.8 m (6 ft) in length shall be permitted to be employed for raceway connection to a motor terminal enclosure. 2017 NEC - 430.223 Raceway Connection To Motors.
What is the maximum cross-sectional value that conduit nipples under 24 inches long may be filled?
60% (4) Where conduit or tubing nipples having a maximum length not to exceed 600 mm (24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of their total cross-sectional area, and 310.15(B)(3)(a) adjustment factors need not apply to this condition. 2017 NEC - Chapter 9 Tables Notes to Tables
What is the maximum cross-sectional value that conduit nipples under 24 inches long may be filled?
60% (4) Where conduit or tubing nipples having a maximum length not to exceed 600 mm (24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of their total cross-sectional area, and 310.15(B)(3)(a) adjustment factors need not apply to this condition. 2017 NEC - Chapter 9 Tables Notes
The total marked rating of a cord-and- attachment-plug-connected room air conditioner shall not exceed______ of the rating of a branch circuit where no other loads are supplied.
80 percent The total marked rating of a cord- and attachment-plug- connected room air conditioner shall not exceed 80 percent of the rating of a branch circuit where no other loads are supplied. 2017 NEC 440.62(B) Where No Other Loads Are Supplied.
A 2" EMT using a One Shot bender has a minimum bending radius of:
9.5 inches 2017 NEC - Chapter 9, Table 2 Radius of Conduit and Tubing Bends NEC
A 2" EMT using a One Shot bender has a minimum bending radius of:
9.5 inches 2017 NEC Chapter 9, Table 2 Radius of Conduit and Tubing Bends
In emergency circuits, branch-circuit overcurrent devices are accessible only to:
Authorized persons The branch-circuit overcurrent devices in emergency circuits shall be accessible to authorized persons only. 2017 NEC 700.30 Accessibility.
Fixed outdoor electric deicing and snow- melting equipment shall be considered as a _______ load.
Continuous Fixed outdoor electric deicing and snow-melting equipment shall be considered a continuous load. 2017 NEC 426.4 Continuous Load.
Fixed outdoor electric deicing and snow- melting equipment shall be considered as a ________load.
Continuous Fixed outdoor electric deicing and snow-melting equipment shall be considered a continuous load. 2017 NEC 426.4 Continuous Load.
Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed _______ for a nominal, 120-volt rating.
10 feet Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed 3.0 m (10 ft) for a nominal, 120-volt rating or 1.8 m (6 ft) for a nominal, 208- or 240-volt rating. 2017 NEC - 440.64 Supply Cords.
Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed________ for a nominal, 120-volt rating.
10 feet Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed 3.0 m (10 ft) for a nominal, 120-volt rating or 1.8 m (6 ft) for a nominal, 208- or 240-volt rating. 2017 NEC 440.64 Supply Cords.
A legally required standby system must have rating and capacity sufficient for how much of the loads expected to operate at the same time on the standby system?
100% of the loads A legally required standby system shall have adequate capacity and rating for the supply of all equipment intended to be operated at one time. Legally required standby system equipment shall be suitable for the maximum available fault current at its terminals. 2017 NEC 701.4 Capacity and Rating.
The disconnecting means for motor circuits rated 1000 volts nominal, or less, must have an ampere rating of at least________ of the full-load current rating of the motor.
115 percent The disconnecting means for motor circuits rated 1000 volts, nominal, or less shall have an ampere rating not less than 115 percent of the full-load current rating of the motor. 2017 NEC - 430.110(A) General.
The disconnecting means for motor circuits rated 1000 volts nominal, or less, must have an ampere rating of at least_________ of the full-load current rating of the motor.
115 percent The disconnecting means for motor circuits rated 1000 volts, nominal, or less shall have an ampere rating not less than 115 percent of the full-load current rating of the motor. 2017 NEC 430.110(A) General.
What is the minimum separation for overhead communications wires and cables at any point in the span from supply service-drops of up to 750 volts?
12 inches Supply service drops and sets of overhead service conductors of 0 to 750 volts running above and parallel to communications service drops shall have a minimum separation of 300 mm (12 in.) at any point in the span, including the point of and at their attachment to the building, provided that the ungrounded conductors are insulated and that a clearance of not less than 1.0 m (40 in.) is maintained between the two services at the pole. 2017 NEC - 800.44(A)(4) Clearance.
What is the minimum separation for overhead communications wires and cables at any point from supply service-drops of up to in the span 750 volts?
12 inches Supply service drops and sets of overhead service conductors of 0 to 750 volts running above and parallel to communications service drops shall have a minimum separation of 300 mm (12 in.) at any point in the span, including the point of and at their attachment to the building, provided that the ungrounded conductors are insulated and that a clearance of not less than 1.0 m (40 in.) is maintained between the two services at the pole. 2017 NEC 800.44(A)(4) Clearance.
A luminaire (fixture) that exceeds_______ in any dimension shall not be supported by the screw shell of a lampholder.
16 inches Luminaires and lampholders shall be securely supported. A luminaire that weighs more than 3 kg (6 Ib) or exceeds 400 mm (16 in.) in any dimension shall not be supported by the screw shell of a lampholder. 2017 NEC 410.30(A) General.
The length of cord for electrically operated kitchen waste disposers shall not be less than______ inches.
18 inches (2) The length of the cord shall not be less than 450 mm (18 in.) and not over 900 mm (36 in.). 2017 NEC 422.16(B)(1) Electrically Operated In-Sink Waste Disposers.
What is the minimum allowable trade size intermediate metal conduit (IMC) required to contain a total of ten (10) copper THW conductors in a 20 foot run, five (5) size 1 AWG and five (5) size 3 AWG?
2-1/2 inches Size 1 AWG THW = .1901 sq. in. x 5 = .9505 sq. in. Size 3 AWG THW = .1134 sq. in. x 5 = .537 sq. in. Total = 1.5175 sq. in. 2017 NEC Chapter 9, Table 4 Dimensions and Percent Area of Conduit and Tubing (Areas of Conduit or Tubing for the Combinations of Wires Permitted in Table 1, Chapter 9) (page 70-680)
What is the minimum allowable trade size intermediate metal conduit (IMC) required to THW contain a total of ten (10) copper conductors in a 20 foot run, five (5) size 1 AWG and five (5) size 3 AWG?
2-1/2 inches Size 1 AWG THW = .1901 sq. in. x 5 = .9505 sq. in. Size 3 AWG THW = .1134 sq. in. x 5 = .537 sq. in. Total = 1.5175 sq. in. 2017 NEC - Chapter 9, Table 4 Dimensions and Percent Area of Conduit and Tubing (Areas of Conduit or Tubing for the Combinations of Wires Permitted in Table 1, Chapter 9) (page 70-680)
Heavy-duty lighting track is lighting track identified for use exceeding _________ amperes.
20 Heavy-duty lighting track is lighting track identified for use exceeding 20 amperes. Each fitting attached to a heavy-duty lighting track shall have individual overcurrent protection. 2017 NEC - 410.153 Heavy-Duty Lighting Track.
What is the maximum load that may be carried by branch circuits for luminaires installed as border lighting for stages in theaters?
20 amperes Footlights, border lights, and proscenium sidelights shall be arranged so that no branch circuit supplying such equipment carries a load exceeding 20 amperes. 2017 NEC - 520.41(A) Circuits Rated 20 Amperes or Less.
What is the maximum load that be carried may by branch circuits for luminaires installed as border lighting for stages in theaters?
20 amperes Footlights, border lights, and proscenium sidelights shall be arranged so that no branch circuit supplying such equipment carries a load exceeding 20 amperes. 2017 NEC - 520.41(A) Circuits Rated 20 Amperes or Less.
The area around motor fuel dispensing pumps at a service station is considered a hazardous location. How far horizontally from the enclosure of the outdoor motor fuel dispensing pumps does this extend?
20 feet Table 514.3(B)(1) shall be applied where Class I liquids are stored, handled, or dispensed and shall be used to delineate and classify motor fuel dispensing facilities and commercial garages as defined in Article 511. Table 515.3 shall be used for the purpose of delineating and classifying aboveground tanks. A Class I location shall not extend beyond an unpierced wall, roof, or other solid partition. 2017 NEC - 514.3(B)(1) Class I Locations. Table 514.3(B)(1) Class I Locations Motor Fuel Dispensing Facilities (page 70- 400)
The area around motor fuel dispensing pumps at a service station is considered a hazardous location. How far horizontally from the enclosure of the outdoor motor fuel dispensing pumps does this extend?
20 feet Table 514.3(B)(1) shall be applied where Class I liquids are stored, handled, or dispensed and shall be used to delineate and classify motor fuel dispensing facilities and commercial garages as defined Article 511. Table 515.3 shall be used for the purpose of delineating and classifying aboveground tanks. A Class I location shall not extend beyond an unpierced wall, roof, or other solid partition. 2017 NEC - 514.3(B)(1) CIlass I Locations. Table 514.3(B)(1) Class I Locations Motor Fuel Dispensing Facilities (page 70- 400)
that a What is the maximum number of amps branch-circuit supplying a neon tubing installation should have?
30 amperes Branch circuits that supply neon tubing installations shall not be rated in excess of 30 amperes. 2017 NEC 600.5(B)(1) Neon Signs.
What is the maximum rating on a branch circuit supplying more than one electric baseboard heater in a residential occupancy?
30 amperes Individual branch circuits shall be permitted to supply any volt- ampere or wattage rating of fixed electric space-heating equipment for which they are rated. Branch circuits supplying two or more outlets for fixed electric space-heating equipment shall be rated not over 30 amperes. In other than a dwelling unit, fixed infrared heating equipment shall be permitted to be supplied from branch circuits rated not over 50 amperes. 2017 NEC 424.3(A) Branch-Circuit Requirements.
The length of cord for electrically operated kitchen waste disposers shall not be over_____ inches.
36 inches (2) The length of the cord shall not be less than 450 mm (18 in.) and not over 900 mm (36 in.). 2017 NEC - 422.16(B)(1) Electrically Operated In-Sink Waste Disposers.
What is the maximum distance from any section of the sign display for the disconnecting means to be from electric signs or outline lighting systems?
50 feet The disconnecting means shall be within sight of the sign or outline lighting system that it controls. Where the disconnecting means is out of the line of sight from any section that is able to be energized, the disconnecting means shall be lockable in accordance with 110.25. A permanent field- applied marking identifying the location of the disconnecting means shall be applied to the sign in a location visible during servicing. The warning label shall comply with 110.21(B). 2017 NEC - 600.6(A)(2) Within Sight of the Sign. 2017 NEC - Article 100 Definitions. In Sight From (Within Sight From, Within Sight).
What is the maximum distance from any section of the sign display for the disconnecting means to be from electric signs or outline lighting systems?
50 feet The disconnecting means shall be within sight of the sign or outline lighting system that it controls. Where the disconnecting means is out of the line of be applied to the sign in a location visible during servicing. The warning applied marking identifying the location of the disconnecting means shall means shall be lockable in accordance with 110.25. A permanent field- sight from any section that is able to be energized, the disconnecting label shall comply with 110.21(B). 2017 NEC - 600.6(A)(2) Within Sight of the Sign. 2017 NEC - Article 100 Definitions. In Sight From (Within Sight From, Within Sight).
Flexible metal conduit or liquidtight flexible metal conduit not exceeding ______in length shall be permitted to be employed for raceway connection to a motor terminal enclosure.
6 feet Flexible metal conduit or liquidtight flexible metal conduit not exceeding 1.8 m (6 ft) in length shall be permitted to be employed for raceway connection to a motor terminal enclosure. 2017 NEC 430.223 Raceway Connection To Motors.
Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed______ for 208- or 240-volt rating.
6 feet Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed 3.0 m (10 ft) for a nominal, 120-volt rating or 1.8 m (6 ft) for a nominal, 208- or 240-volt rating. 2017 NEC - 440.64 Supply Cords.
What is the minimum separation that shall be maintained, where practicable, between lightning conductors and communications wires and cables on buildings?
6 feet Where practicable, a separation of at least 1.8 m (6 ft) shall be maintained between communications wires and cables on buildings and lightning conductors. 2017 NEC - 800.53 Lightning Conductors.
What is the minimum separation that shall be maintained, where practicable, between lightning conductors and communications wires and cables on buildings?
6 feet Where practicable, a separation of at least 1.8 m (6 ft) shall be maintained between communications wires and cables on buildings and lightning conductors. 2017 NEC 800.53 Lightning Conductors.
Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed for 208- or 240-volt rating.
6 feet Where a flexible cord is used to supply a room air conditioner, the length of such cord shall not exceed 3.0 m (10 ft) for a nominal, 120-volt rating or 1.8 m (6 ft) for a nominal, 208- or 240-volt rating. 2017 NEC - 440.64 Supply Cords.
If a metal pole is less than _________ in height, then a handhole is not required.
8 feet Exception No. 1: No handhole shall be required in a pole 2.5 m (8 ft) or less in height abovegrade where the supply wiring method continues without splice or pull point, and where the interior of the pole and any splices are accessible by removing the luminaire. 2017 NEC 410.30(B) Metal or Nonmetallic Poles Supporting Luminaires.
The total marked rating of a cord-and- attachment-plug-connected room air conditioner shall not exceed _______ of the rating of a branch circuit where no other loads are supplied.
80 percent The total marked rating of a cord- and attachment-plug- connected room air conditioner shall not exceed 80 percent of the rating of a branch circuit where no other loads are supplied. 2017 NEC - 440.62(B) Where No Other Loads Are Supplied.
Which Article has the requirements for the installation of wiring for radio and television receiving equipment, including amateur/citizen band radio equipment antennas and digital satellite receiving equipment for television signals.
810 This article covers antenna systems for radio and television receiving equipment, amateur and citizen band radio transmitting and receiving equipment, and certain features of transmitter safety. This article covers antennas such as wire-strung type, multi- element, vertical rod, flat, or parabolic and also covers the wiring and cabling that connect them to equipment. This article does not cover equipment and antennas used for coupling carrier current to power line conductors. 2017 NEC 810.1 Scope.
A shortened form of a word or phrase is an:
Abbreviation
In emergency circuits, branch-circuit overcurrent devices are accessible only to:
Authorized persons The branch-circuit overcurrent devices in emergency circuits shall be accessible to authorized persons only. 2017 NEC - 700.30 Accessibility.
Where are cutting planes for section view shown?
Floor plan Plan view (orthographic view looking straight down) of a floor. An imaginary cut is made across the building 2 or 3 feet off the floor to expose the floor. Walls, partitions, doors, windows, fixtures, stairs, and dimensions are shown. Floor plans are identified by their location in a structure: a first floor plan, second floor plan, basement plan, foundation plan.
Ground-fault circuit-interrupter protection for personnel shall be provided for cables installed in electrically heated________ of bathrooms, kitchens, and in hydromassage bathtub locations.
Floors Ground-fault circuit-interrupter protection for personnel shall be provided for cables installed in electrically heated floors of bathrooms and kitchens and in hydromassage bathtub locations. 2017 NEC - 424.44(E) Ground-Fault Circuit-Interrupter Protection.
Ceiling-suspended (paddle) fans shall be supported______ of the outlet box.
Independently Ceiling-suspended (paddle) fans shall be supported independently of an outlet box or by one of the following: (1) A listed outlet box or listed outlet box system identified for the use and installed in accordance with 314.27(C) (2) A listed outlet box system, a listed locking support and mounting receptacle, and a compatible factory installed attachment fitting designed for support, identified for the use and installed in accordance with 314.27(E) 2017 NEC - 422.18 Support of Ceiling-Suspended (Paddle) Fans.
What is required for the installation of wiring for the essential electrical system in patient care areas of hospitals?
Nonflexible metal raceways ( 1) Nonflexible metal raceways, Type MI cable, Type RTRC marked with the suffix -XW, or Schedule 80 PVC conduit. Nonmetallic raceways shall not be used for branch circuits that supply patient care areas. 2017 NEC 517.31(C)(3) Mechanical Protection of the Essential Electrical System.
What is required for the installation of wiring for the essential electrical system in patient care areas of hospitals?
Nonflexible metal raceways (1) Nonflexible metal raceways, Type MI cable, Type RTRC marked with the suffix -XW, or Schedule 80 PVC conduit. Nonmetallic raceways shall not be used for branch circuits that supply patient care areas. 2017 NEC 517.31(C)(3) Mechanical Protection of the Essential Electrical System.
A detailed plan of a building that is orthographically drawn with a conventional representation of lines, and includes symbols and abbreviations is a:
Who determines the classification of hazardous areas and zones?
Qualified persons Classification of areas, engineering and design, selection of equipment and wiring methods, installation, and inspection shall be performed by qualified persons. 2017 NEC - 505.7(A) Implementation of Zone Classification System.
Who determines the classification of hazardous areas and zones?
Qualified persons Classification of areas, engineering and design, selection of equipment and wiring methods, installation, and inspection shall be performed by qualified persons. 2017 NEC 505.7(A) Implementation of Zone Classification System.
Luminaries (fixtures) shall not be used as a _______ for circuit conductors.
Raceway Luminaires shall not be used as a raceway for circuit conductors unless they comply with 410.64(A), (B), or (C). 2017 NEC 410.64 Luminaries as Raceways.
Disconnecting means shall be located within of and readily accessible from air-conditioning or refrigerating equipment.
Sight Disconnecting means shall be located within sight from, and readily accessible from the air-conditioning or refrigerating equipment. The disconnecting means shall be permitted to be installed on or within the air-conditioning or refrigerating equipment. The disconnecting means shall not be located on panels that are designed to allow access to the air-conditioning or refrigeration equipment or to obscure the equipment nameplate(s). 2017 NEC - 440.14 Location.
Disconnecting means shall be located within __________ of and readily accessible from air-conditioning or refrigerating equipment.
Sight Disconnecting means shall be located within sight from, and readily accessible from the air-conditioning or refrigerating equipment. The disconnecting means shall be permitted to be installed on or within the air-conditioning or refrigerating equipment. The disconnecting means shall not be located on panels that are designed to allow access to the air-conditioning or refrigeration equipment or to obscure the equipment nameplate(s). 2017 NEC - 440.14 Location.
___________ conductors shall be used for wiring on luminaire (fixture) chains and on other movable or flexible parts.
Stranded Stranded conductors shall be used for wiring on luminaire chains and on other movable or flexible parts. 2017 NEC - 410.56(E) Stranding.
True or False: Except as modified by Article 517, iring used in health care locations are required to comply with the provisions of Chapter 1 through 4 of the NEC.
True Except as modified in this article, wiring methods shall comply with the applicable provisions of Chapters 1 through 4 of this Code. 2017 NEC - 517.12 Wiring Methods.
True or False: Wiring methods that supply a sign enclosure or cabinet must terminate inside the sign or outline lighting system enclosure.
True The wiring method used to supply signs and outline lighting systems shall terminate within a sign, an outline lighting system enclosure, a suitable box, or a conduit body. 2017 NEC - 600.5(C)(1) Supply.
True or False: The NEC does NOT cover installations in ships, aircraft, or underground mines.
True This Code does not cover the following: (1) Installations in ships, watercraft other than floating buildings, railway rolling stock, aircraft, or automotive vehicles other than mobile homes and recreational vehicles. (2) Installations underground in mines and self-propelled mobile surface mining machinery and its attendant electrical trailing cable 2017 NEC - 90.2(B) Not Covered.
True or False: Except as modified by Article 517, wiring used in health care locations are required to comply with the provisions of Chapter 1 through 4 of the NEC.
True Except as modified in this article, wiring methods shall comply with the applicable provisions of Chapters 1 through 4 of this Code. 2017 NEC 517.12 Wiring Methods.
A single section (of track for lighting) 4 feet or shorter in length shall have _________supports.
Two Lighting track shall be securely mounted so that each fastening is suitable for supporting the maximum weight of luminaires that can be installed. Unless identified for supports at greater intervals, a single section 1.2 m (4 ft) or shorter in length shall have two supports, and, where installed in a continuous row, each individual section of not more than 1.2 m (4 ft) in length shall have one additional support. 2017 NEC - 410.154 Fastening.
Because symbols can be understood no matter what language is spoken, this makes them:
Universal
The temporary connection of a portable generator without transfer equipment may be allowed for optional standby systems, provided that maintenance and supervision make certain that only qualified persons service the installation, and the normal supply is physically isolated by:
a lockable disconnecting means or the disconnection of the normal supply conductors Exception: Temporary connection of a portable generator without transfer equipment shall be permitted where conditions of maintenance and supervision ensure that only qualified persons service the installation and where the normal supply is physically isolated by a lockable disconnecting means or by disconnection of the normal supply conductors. 2017 NEC - 702.5 Transfer Equipment.
The temporary connection of a portable generator without transfer equipment may be allowed for optional standby systems, provided that maintenance and supervision make certain that only qualified persons service the installation, and the normal supply is physically isolated by:
a lockable disconnecting means or the disconnection of the normal supply conductors Exception: Temporary connection of a portable generator without transfer equipment shall be permitted where conditions of maintenance and supervision ensure that only qualified persons service the installation and where the normal supply is physically isolated by a lockable disconnecting means or by disconnection of the normal supply conductors. 2017 NEC - 702.5 Transfer Equipment.
An optional standby system that uses automatic transfer equipment must have rating and capacity sufficient for the supply of:
the load, as calculated in Article 220 The calculations of load on the standby source shall be made in accordance with Article 220 or by another approved method. 2017 NEC - 702.4(B) System Capacity.