2017 NEC Update Part 1

2017 NEC Update Part 1

RV 8.18.17

1

2017 NEC Update Part 1

RV 8.18.17

Quiz 1

1. NEC chapters 5 through 7 cover ______.

• general occupancies
• special equipment
• utilities
• all of the answers provided

1. The NEC governs all things electrical, including electrical utility storage equipment.

• True
• False

1. If equipment is listed, it ______for use in every installation.

• is permitted
• is not permitted without approval
• is suitable
• may not be suitable

1. NEC accessibility requirements allow for ______to gain access to electrical equipment.

• crawling under obstacles
• climbing ladders
• using keys
• using tools

1. If a building is larger than the building code allows, ______.

• it must be torn down
• it can be divided by fire walls
• it must be constructed from brick
• it cannot contain any electrical equipment

1. A cable routing assembly may contain ______.

• only optical fiber cables
• power-limited fire alarm cables
• uninsulated conductors
• all of the answers provided

1. Computers, routers, servers and ______are becoming essential to the transmission of audio, video and data.

• their powering equipment
• DVD players
• their shipping containers
• stereos

1. A communications raceway may contain ______.

• any type of cable
• optical fiber cables
• anything related to communications
• only copper conductors

1. A cord connector designated for hazardous locations must include ______.

• an explosion-proof seal
• a flameproof seal
• either of the answers provided
• none of the answers provided

1. Dusttight enclosures are designed to prevent dust from entering______.

• except under extreme conditions
• under specified conditions
• in outdoor environments
• in hazardous environments

1. The NEC’s definition of electric signs does not include those that are ______.

• illuminated
• portable
• non-illuminated
• none of the answers provided

1. A Field Evaluation Body (FEB) performs field evaluations of ______.

• electrical equipment
• wire coating
• hazardous locations
• inspector compliance

1. Equipment that has been labeled by a Field Evaluation Body indicating that it was found to comply with requirements is called ______.

• suitable
• non-hazardous
• dusttight
• field labeled

1. A photovoltaic system converts solar energy into electrical energy ______.

• that is useless for any practical applications
• with the use of the wind
• for connection to a utilization load
• only for self-contained systems

1. A process seal for hazardous locations is a seal between electrical systems and ______.

• the surrounding air
• flammable or combustible fluids
• flood water
• none of the answers provided

1. A raceway may be nonmetallic.

• True
• False

1. A receptacle is a______installed at the outlet for the connection of an attachment plug.

• surge protector
• bare conductor termination
• watertight seal
• contact device

1. The NEC’s definition of a structure includes ______.

• a free-standing switchboard
• a light pole
• an electric sign
• none of the answers provided

1. A ______is an assemblage of equipment through which electric energy is passed for the purpose of distribution.

• photovoltaic cell
• fuse
• substation
• conductor

Quiz 2

1. Product testing, evaluation and listing may be performed by ______.

• recognized qualified electrical testing laboratories
• an inspector in the field
• any licensed electrician
• all of the answers provided

1. The NEC has specified that all conductors are to be ______or ______unless otherwise specified.

• sealed, protected
• copper, aluminum
• glued, stapled
• titanium, steel

1. Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage ______the current that is available at the line terminals of the equipment.

• greater than
• less than
• at least equal to
• suitable for

1. Equipment identified ______, such as “dry locations,” “indoor use only” or “damp locations” shall be protected against damage from the weather during construction.

• only for outdoor use
• as refurbished
• with a field label
• only for indoor use

1. The 2017 NEC ______the use of a calibrated torque tool to achieve the indicated torque when installing electrical equipment.

• requires
• prefers
• recommends
• does not allow

1. The NEC requires that arc-flash hazard warning labels contain ______.

• a picture of a lightning bolt
• a bright yellow background
• the date the label was applied
• the initials of the person who applied the label

1. The NEC does not require service equipment labeling if an arc-flash label is applied in accordance with acceptable industry practice.

• True
• False

1. The marking requirement for reconditioned equipment states that the label must contain ______.

• the current owner’s company name
• an orange background
• the date of the reconditioning
• the date of original manufacture

1. The NEC does not require reconditioned equipment to be labeled when ______.

• there’s no good place to put a label
• the equipment is only accessible by qualified service persons
• it’s obvious that the equipment is not new
• the equipment is located where no one would likely see the label anyway

1. Field-applied hazard markings must warn of ______using effective words, colors, symbols or any combination of the three.

• ambient air temperature
• water proximity
• conductor size
• hazards

1. The calculation of the available fault current of an electrical system ______.

• must be made available to authorized inspectors
• can only be done for residential installations
• should not be stored with other documentation
• all of the answers provided

1. Where equipment operating at 1000 volts or less to ground that requires servicing while energized is installed above a lay-in ceiling, the accessible opening must be ______.

• smaller than 22 inches by 22 inches
• at least 30 inches by 30 inches
• no less than 22 inches by 22 inches
• large enough to fit two electricians working side by side

1. Equipment operating at 500 volts or less to ground that requires adjustment while energized is installed in a crawl space with limited access. The accessible opening must be ______.

• at least 22 inches by 22 inches
• approved for equipment servicing
• no further than 6 feet from an exit
• no less than 22 inches by 30 inches

1. In enclosures with exposed live parts, ______must be separated from high-voltage equipment by a suitable partition, fence or screen.

• residential spaces
• low-voltage equipment
• communications raceways
• water pipes

1. Illumination for working spaces around service equipment ______.

• can be automatic as long as there is also a manual override
• should not use LED bulbs
• must be at least 12 inches from the service equipment
• must turn on automatically

1. Roof extensions are not permitted in the working clearance space around electrical equipment.

• True
• False

1. Outdoor electrical equipment shall be installed in ______.

• metallic boxes requiring key access
• locked buildings
• enclosures rated for hazardous locations
• identified enclosures

1. Live parts of electrical equipment operating at ______shall be guarded against accidental contact by approved enclosures or elevation above the floor.

• standard temperature
• high altitudes
• 50 to 1000 volts nominal
• maximum capacity

1. A complete electrical system design shall be made available to the AHJ and shall be tested when ______.

• first installed on site
• the AHJ is available to watch
• the AHJ is not available to watch
• the installation is 50% complete

Quiz 3

1. NEC Article 210 provides general requirements for ______.

• enclosure fill calculations
• conduit and tubing sizing
• wiring methods
• branch circuits

1. The 2017 NEC conductor grouping requirements for multi-wire branch circuits mandate that all ungrounded and neutral circuit conductors must______in every enclosure.

• not be grouped together
• be grouped together
• be at least 10 AWG
• not touch each other

1. In an installation with an existing voltage system where a new voltage system is being added, it is permissible to ______.

• not mark the new system when it’s easy to tell them apart
• mark only the old system as “OLD SYSTEM”
• mark the new system with a ball-point pen
• mark only the new system voltage

1. For branch circuits supplied from DC systems, the NEC permits size ______conductors to be marked at termination, connection and splice points, rather than along the entire length of the conductor.

• 2 AWG
• 4 AWG
• 8 AWG
• none of the answers provided

1. When determining the distance from a receptacle to a bathtub, measure the shortest path an appliance cord connected to the receptacle would follow, even for receptacles located outside the bathroom doorway.

• True
• False

1. GFCI protection in unfinished portions of dwelling unit basements ______.

• must be installed
• must not be installed
• must be installed only if someone occasionally sleeps in the unfinished basement
• must not be installed if the area is used for food storage

1. To determine if a GFCI receptacle is required near a sink in a dwelling unit bathroom, measure from the receptacle location to ______.

• the outside edge of the sink
• the top inside edge of the sink bowl
• the center of the sink drain
• none of the answers provided

1. In commercial building crawl spaces, ______must have GFCI protection.

• single-phase receptacles rated 150 volts to ground
• three-phase receptacles rated 250 volts to ground
• both of the answers provided above
• none of the answers provided

1. Lighting outlets in crawl spaces are required to be GFCI protected ______.

• in any building where the crawl space is less than 3 feet tall
• only in residential buildings
• only in non-dwelling units
• in both residential and commercial buildings

1. At least one 120-volt, 20-amp dedicated branch circuit shall be installed to supply receptacle outlets in ______.

• detached garages with electrical power
• detached garages without electrical power
• detached garages with only one stall
• none of the answers provided

1. 120V, single-phase, 15A and 20A branch circuits supplying outlets and devices installed in ______of hotels shall be AFCI protected.

• medicine cabinets
• conference rooms
• guest rooms
• workout rooms

1. When calculating wall space for receptacle installation, it is not necessary to include ______.

• spaces less than 2 feet wide
• spaces with countertops
• space measured around corners
• none of the answers provided

1. A receptacle outlet to serve a specific appliance______to be supplied from an individual branch circuit rated 15 amps or greater.

• may not be permitted
• is never allowed
• shall be required
• shall be permitted

1. A peninsular countertop measuring ______does not require a receptacle outlet.

• 20 inches wide by 24 inches long
• 12 inches wide by 30 inches long
• 12 inches wide by 20 inches long
• 14 inches wide by 22 inches long

1. In an attached garage, at least one receptacle outlet must be installed ______. (choose the best answer)

• in each vehicle bay
• higher than 5-1/2 feet above the floor
• both of the answers provided
• neither of the answers provided

1. A receptacle outlet must be installed within 25 feet of indoor service equipment.

• True
• False

1. Where the service voltage is greater than 120 volts to ground, a receptacle outlet is not required for services dedicated to ______.

• solar cells
• pond filtration pumps
• industrial washing machines
• none of the answers provided

1. When installing dimmer switches for dwelling unit stairwell lighting, ______.

• three-way switches must be used
• four-way switches must be used
• dimmer switches must be installed at each switch location
• only dial-type dimmer switches may be used

1. In utility rooms containing equipment requiring servicing, ______containing a switch or controlled by a wall switch shall be installed.

• at least one lighting outlet
• at least one receptacle outlet
• at least one panelboard
• all of the answers provided

1. When determining the required number of receptacle outlets for a non-dwelling meeting room, ______must be considered.

• the number of computers likely to be used in the room at one time
• the number of overhead lights
• the minimum size of the room with the partitions in place
• none of the answers provided

Quiz 4

1. If the OCPD protecting the feeder in an assembly is listed for operation at 100% of its rating, the allowable ampacity of the minimum-sized feeder conductors must be at least the sum of the noncontinuous load plus______of the continuous load.

• 80%
• 90%
• 100%
• 125%

1. Where a portion of a feeder is connected at both its supply and load ends to separately installed pressure connections, the allowable ampacity must be at least ______.

• 125% of the noncontinuous load
• 125% of the continuous load
• the sum of the continuous load plus the noncontinuous load
• the sum of 125% of the continuous load plus the noncontinuous load

1. Grounded conductors that are ______are permitted to be sized at 100% of the continuous and noncontinuous load.

• at least size 10 AWG
• not connected to an overcurrent device
• connected to an overcurrent protection device
• installed in flexible metal conduit

1. The 2017 NEC Article 220 provides requirements for calculating ______.

• branch-circuit size
• feeder installation
• enclosure fill
• service loads

1. Table 220.12 General Lighting Loads by Occupancy provides a value of ______for schools.

• 2 VA per sq. ft.
• 3 VA per sq. ft.
• 3.5 VA per sq. ft.
• 1.2 VA per sq. ft.

1. Using NEC Article 220.12 Exception No. 2 and Table 220.12 for a 75,000-sq. ft. bank building with a continuous lighting load, the minimum lighting load is ______.

• 328,125 VA
• 187,500 VA
• 234,375 VA
• 262,500 VA

1. Using NEC Article 220.12 Exception No. 2 and Table 220.12 for a 125,000-sq. ft. office building with a continuous lighting load, the minimum lighting load is ______.

• 234,375 VA
• 328,125 VA
• 546,875 VA
• 390,625 VA

1. The minimum unit lighting load for a grocery store is ______.

• 3-1/2 VA per square foot
• 2 VA per square foot
• 3 VA per square foot
• 1 VA per square foot

1. When determining existing service loads, the calculation can be based on load data measured for 30 days in the event that maximum demand data for ______is not available.

• adjacent buildings
• existing refurbished equipment
• a 2-year period
• a 1-year period

1. A mast supporting overhead feeder conductors must have adequate strength to safely withstand the strain imposed by the overhead conductors or it must be supported by ______.

• extra couplings
• a wide metal base
• braces or guys
• none of the answers provided

1. Overhead spans of open multiconductor cables over rooftops must have vertical clearance of ______.

• no more than 8 feet 6 inches
• no more than 8 feet
• no less than 8 feet
• no less than 8 feet 6 inches

1. Raceways on building exteriors are required to be ______.

• arranged to drain
• approved by the AHJ
• listed for use in hazardous locations
• all of the answers provided

1. Raceway sealants must be ______.

• listed for the purpose
• identified for use with the components present
• explosion-proof
• approved for use in hazardous locations

1. Electric vehicle charging stations may be listed, labeled and identified for more than one feeder or branch circuit.

• True
• False

1. Service raceways are permitted to contain ______.

• feeder conductors
• branch-circuit conductors
• overcurrent protection devices
• service conductors

1. The 2017 NEC allows trees to be used to support ______.

• overhead service conductors
• electrical service equipment
• both of the answers provided
• none of the answers provided

1. Overhead service conductors ______.

• may not pass over railroad tracks
• must clear railroad tracks by at least 20 feet
• must clear railroad tracks by at least 24-1/2 feet
• must cross railroad tracks underground

1. Metal support structures supporting overhead service conductors passing over a roof must be bonded to ______.

• the grounded overhead service conductor
• the side of the building
• an additional metal structure that touches the ground
• the rooftop

1. For an installation with a 200A, 3-phase, continuous load with 3 current-carrying copper conductors with insulation rated at 75°C, what size service-entrance conductors are required?

• 4/0 AWG
• 250 AWG
• 300 AWG
• 350 AWG

1. For an installation with a 240A, 3-phase, continuous load with 3 current-carrying copper conductors with insulation rated at 75°C, what size service-entrance conductors are required?

• 250 AWG
• 300 AWG
• 350 AWG
• 400 AWG

1. Cables permitted for use in cable trays ______.

• must be listed for use in cable trays
• must be field labeled with “CT”
• must be marked by the manufacturer with “CT”
• all of the answers provided

1. Raceways enclosing service-entrance conductors must be listed or approved as rainproof.

• True
• False

1. The 2017 NEC requires that service heads on service-entrance cables are located ______the service drop.

• below the point of attachment of
• above the point of attachment of
• above the roofline of
• within a gooseneck at

1. A meter socket does not need to be listed when ______.

• it is rated for the voltage and ampacity of the service
• it’s an individual meter socket
• it is going to be field labeled
• it’s under the exclusive control of an electric utility

1. The NEC does not allow ______to be connected to the supply side of a service disconnect.

• solar PV systems
• batteries
• HVAC equipment
• wind electric systems

1. Where fuses are used as the service overcurrent device, the ______shall be located ahead of the supply side of the fuses.

• meter socket
• disconnecting means
• attach point
• raceway

Quiz 5

1. According to Table 240.6(A), ______is a standard ampere rating for a fuse.

• 45
• 55
• 65
• 75

1. If we calculate the minimum ampere rating for a fuse of 180 amps, what standard ampere rating fuse should we select?

• 175 amps
• 200 amps
• 210 amps
• 300 amps

1. If a tool is required to open an industrial control panel, it is considered to be ______.

• not readily accessible
• not suitable for use
• readily accessible
• suitable for use with AHJ approval

1. If a 1500 A fuse has a clearing time of .08 seconds at the available arcing current, ______.

• the NEC does not permit its use
• another method of arc energy reduction must be provided
• the AHJ must approve it for use in that installation
• differential relaying must be used

1. If arcing currents exceed the instantaneous trip level, the circuit breaker will trip ______.

• in the maximum possible time
• before a fire can start
• when the arc energy increases
• in the minimum possible time

1. NFPA 780-2014, Standard for the Installation of Lightning Protection Systems provides information on installation of grounding and bonding for lightning protection systems.

• True
• False

1. In order to stop objectionable current, the NEC permits ______alteration(s).

• installer-tested
• multiple
• only one
• objectionable

1. Class 2 load-side circuits for suspended ceiling low-voltage power grid distribution systems shall not be______.

• readily accessible
• installed below a height of 6-1/2 feet from the floor
• grounded
• none of the answers provided

1. The grounded conductor in a single raceway or cable shall not be ______specified in Table 250.102(C)(1).

• larger than
• smaller than
• of any type
• insulated, as

1. If a building is supplied by a feeder from an outdoor separately derived system, a system bonding jumper at both the source and the first disconnecting means shall be permitted.

• Yes, if the AHJ approves it.
• No, this is never permitted.
• Yes, if it does not establish a parallel path for the grounded conductor.
• Yes, but only if the separately derived system is a transformer.

1. The ______must be used as the grounding electrode for a separately derived alternating-current system.

• building or structure grounding electrode system
• closest water pipe
• largest metal structural element
• all of the answers provided

1. The common grounding electrode conductor for a separately derived alternating-current system is permitted to be ______.

• any metal pipe
• any PVC pipe
• a metal water pipe
• a metal gas pipe

1. A metal in-ground support structure in direct contact with the earth ______, with or without concrete encasement is permitted to be used as a grounding electrode.

• horizontally for at least 20 feet
• vertically for at least 10 feet
• vertically for no more than 10 feet
• over an area of at least 10 square feet

1. ______are permitted to be used as grounding electrodes.

• Swimming pools
• Aluminum structures, provided they’re underground,
• Metal gas pipes
• none of the answers provided

1. A ground ring must be installed at least ______below the surface of the earth.

• 30 inches
• 42 inches
• 36 inches
• 48 inches

1. Bonding together of all separate grounding electrodes will limit ______differences between them and between their associated wiring systems.

• ampacity
• material
• voltage
• all of the answers provided

1. A 6 AWG or larger copper or aluminum grounding electrode conductor not exposed to ______shall be permitted to be run along the surface of the building construction without metal covering or protection.

• moisture
• excessive heat
• rain
• physical damage

1. A 6 AWG or larger copper or aluminum grounding electrode conductor exposed to possible physical damage must be protected in ______.

• RMC
• cable armor
• PVC
• any of the answers provided

1. Grounding electrode conductors in contact with the earth shall be buried or otherwise protected ______.

• if subject to physical damage
• unless subject to physical damage
• if subject to flooding
• unless larger than 6 AWG

1. Bonding jumpers from grounding electrodes are permitted to be connected to an aluminum or copper busbar ______and of sufficient length to accommodate the number of terminations necessary for the installation.

• at least 3/8-inch-thick by 2 inches wide
• at least 1∕4-inch-thick by 2 inches wide
• no larger than 1/4-inch-thick by 2 inches wide
• none of the answers provided

1. If a grounding electrode conductor is connected to a single concrete-encased electrode and does not extend to any other electrode requiring a larger size conductor, the grounding electrode conductor does not need to be larger than ______copper wire.

• 8 AWG
• 6 AWG
• 4 AWG
• 2 AWG

1. If a bonding jumper is connected to a 6 AWG copper ground ring and extends to another electrode requiring a 4 AWG conductor, the bonding jumper does not need to be larger than ______.

• 4 AWG
• the size specified by the AHJ
• the size specified by Table 250.66
• 6 AWG

1. A grounding electrode conductor is permitted to extend the connection to an electrode by being connected to interior metal water pipe that is electrically continuous with a metal underground water pipe electrode and located not more than 5 feet from the point of entrance to the building.

• True
• False

1. ______securing the structural steel column that are connected to a concrete-encased electrode that complies with 250.52(A)(3) and is located in the support footing or foundation shall be permitted to connect the metal structural frame of a building or structure to the concrete encased grounding electrode.

• Concrete structures
• Hold-down bolts
• Metal rivets
• all of the answers provided

1. A rebar-type concrete-encased electrode with an additional rebar section extended from its location within the concrete to an accessible location ______shall be permitted for connection of grounding electrode conductors and bonding jumpers.

• at least 18 inches above the earth
• along the building structure
• that is not subject to corrosion
• within 5 feet of the point of entry to the structure

1