codes and standards review
Sectioned equipment grounding conductors smaller than _____ AWG shall be permitted in multiconductor cables, if the combined circular mil area of the sectioned equipment grounding conductors in each cable complies with 250.122.
1/0
Where service-entrance conductors are installed in parallel in two or more raceways or cables, the size of the grounded conductor in each raceway or cable shall be based on the total circular mil area of the parallel ungrounded service-entrance conductors in the raceway or cable, sized in accordance with 250.24(C)(1), but not smaller than _____ AWG.
1/0
The minimum feeder load for show-window lighting is _____ VA per linear foot.
200
Conductor adjustment factors shall not apply to conductors in raceways having a length not exceeding _____ in.
24
Additional requirements for installing receptacles in dwelling unit countertops and work surfaces can be found in Article _____.
406
A circuit breaker having an interrupting current rating of other than _____ shall have its interrupting rating marked on the circuit breaker.
5,000A
Grounding electrodes of the rod type less than _____ in diameter shall be listed.
5/8 in
Overcurrent devices shall not be located _____.
A. near easily ignitible materials, such as in clothes closets b.where exposed to physical damage c. in bathrooms of dwelling units
If the use of multiple grounding connections results in objectionable current and the requirements of 250.4(A)(5) or (B)(4) are met, it shall be permitted to _____.
A.discontinue one or more but not all of such grounding connections b. interrupt the continuity of the conductor or conductive path causing the objectionable current c. change the locations of the grounding connections
If exposed structural metal that is interconnected to form the building frame exists in the area served by the separately derived system, it shall be bonded to the grounded conductor of each separately derived system and each bonding jumper shall be sized in accordance with Table 250.102(C)(1) based on the largest ungrounded conductor of the service.
False
Overhead service conductors or service equipment can be supported to hardwood trees.
False
Where fuses are used as the service overcurrent device, the disconnecting means shall be located ahead of the load side of the fuses in accordance with 230.91.
False
_____ conductors shall not be used for more than one branch circuit, one multiwire branch circuit, or more than one set of ungrounded feeder conductors except as allowed elsewhere in the Code.
Neutral
In industrial laboratories, single-phase receptacles rated 150V to ground or less, 50A or less and three-phase receptacles rated 150V to ground or less, 100A or less within 6 ft of a sink used to supply equipment where removal of power would introduce a greater hazard are not required to be GFCI protected.
True
Independent support wires used for the support of electrical raceways and cables within nonfire-rated assemblies shall be distinguishable from the suspended-ceiling framing support wires.
True
Metal gas piping installed in or attached to a building shall be considered bonded when one or more grounding electrodes are used, if the grounding electrode conductor or bonding jumper to the grounding electrode is of sufficient size.
True
Underground service-entrance conductors shall be protected against physical damage.
True
Ground clamps and fittings that are exposed to physical damage shall be enclosed in _____ or equivalent protective covering.
a or b
The continuity of a grounded conductor shall not depend on a connection to _____.
a raceway a metallic enclosure cable armor any of these
Wiring methods and cabling systems, listed for use in other spaces used for environmental air (plenums), shall be permitted to be installed in ducts specifically fabricated for environmental air-handling purposes _____.
a. if the total length of such wiring methods or cabling systems do not exceed 4 ft b. only if necessary to connect to equipment or devices associated with the direct action upon or sensing of the contained air
Exposed structural metal interconnected to form a metal building frame that is not intentionally grounded or bonded and is likely to become energized, shall be bonded to the _____.
a. service equipment enclosure or building disconnecting means b. grounding electrode conductor where of sufficient size c. grounded conductor at the service
An equipment grounding conductor shall be identified by _____.
any of these
Conductors are considered outside a building when they are installed _____.
any of these
Conductors of ac and dc circuits, rated 1,000V or less, shall be permitted to occupy the same _____ provided that all conductors have an insulation rating equal to the maximum voltage applied to any conductor.
any of these
Insulated conductors used in wet locations shall be _____.
any of these
Service raceways threaded into metal service equipment such as bosses (hubs) are considered to be effectively _____ to the service metal enclosure.
bonded
Where independent support wires of a suspended ceiling assembly are used to support raceways, cable assemblies, or boxes above a ceiling, they shall be secured at _____ end(s).
both
An 800A fuse rated at 1,000V _____ be used on a 250V system.
can
Direct-buried conductors, cables, or raceways, which are subject to movement by settlement or frost, shall be arranged to prevent damage to the _____ or to equipment connected to the raceways.
enclosed conductors
Conductors other than service conductors shall not be installed in the same _____ in which the service conductors are installed.
enclosure and service cable
A(n) _____ shall be used to connect the grounding terminal of a grounding-type receptacle to a grounded box.
equipment bonding jumper
For a separate building or structure supplied by a separately derived system when overcurrent protection is provided where the conductors originate, the supply conductors shall contain a(n) _____.
equipment grounding conductor
A device comprised of _____ or more receptacles shall be calculated at not less than 90 VA per receptacle.
four
Threadless couplings approved for use with IMC in wet locations shall be _____.
listed for wet locations
Additional services shall be permitted for a single building or other structure sufficiently large to make two or more services necessary if permitted by _____.
special permission
A circuit breaker with a _____ voltage rating, such as 240V or 480V, can be used where the nominal voltage between any two conductors does not exceed the circuit breaker voltage rating.
straight
When bare conductors are installed with insulated conductors, their ampacities shall be limited to _____.
the lowest temperature rating for any of the insulated conductors
The requirement for maintaining a 3-foot vertical clearance from the edge of the roof shall not apply to the final feeder conductor span where the conductors are attached to _____.
the side of a building
A receptacle connected to one of the dwelling unit small appliance branch circuits can be used to supply an electric clock.
true
Receptacles installed in a dwelling unit kitchen to serve countertop surfaces shall be supplied by not fewer than _____ small-appliance branch circuits.
two
Cables laid in wood notches require protection against nails or screws by using a steel plate at least _____ in. thick, installed before the building finish is applied.
1/16
The point of attachment of overhead premises wiring to a building shall in no case be less than _____ ft above finished grade.
10
Feeder and service loads for fixed electric space-heating loads shall be calculated at _____ percent of the total connected load.
100
Underground service conductors that supply power to limited loads of a single branch circuit shall not be smaller than _____.
12 AWG copper
The minimum clearance for overhead feeder conductors not exceeding 1,000V that pass over commercial areas subject to truck traffic is _____ ft.
18'
An insulated grounded conductor of _____ AWG or smaller shall be identified by a continuous white or gray outer finish, or by three continuous white or gray stripes along its entire length on other than green insulation.
6
Grounding electrode conductors _____ AWG and larger that are not exposed to physical damage can be run along the surface of the building construction without metal covering or protection.
6
Where the supplemental electrode is a rod, that portion of the bonding jumper that is the sole connection to the supplemental grounding electrode shall not be required to be larger than _____ AWG copper wire.
6
An equipment bonding jumper can be installed on the outside of a raceway, providing the length of the equipment bonding jumper is not more than _____ in. and the equipment bonding jumper is routed with the raceway.
72
Where installed in raceways, conductors _____ AWG and larger shall be stranded, unless specifically permitted or required elsewhere in the NEC.
8
Which of the following appliances installed in residential occupancies need not be connected to an equipment grounding conductor?
A toaster.
If conductors are installed in parallel in the same raceway or cable tray, a single wire-type conductor shall be permitted as the equipment grounding conductor and in accordance with 250.122, based on the overcurrent protective device for the _____.
A. feeder b. branch circuit
NFPA 780, Standard for the Installation of Lightning Protection Systems provides information on the installation of _____ for lightning protection systems [250.4(A)(1)].
a and b
Where IMC enters a box, fitting, or other enclosure, _____ shall be provided to protect the wire from abrasion unless the design of the box, fitting, or enclosure affords equivalent protection.
a bushing
The service disconnecting means rated 1,000V or less shall be marked to identify it as being suitable for use as service equipment and shall be _____.
listed or field labeled
Where documented safe switching procedures are established and maintained and the installation is monitored by _____ individuals, the disconnecting means for a building supplied by a feeder can be located elsewhere on the premises.
qualified
Overhead service-entrance cables shall be equipped with a _____.
service head
The white conductor within a cable can be used for a(n) _____ conductor where permanently reidentified to indicate its use as an ungrounded conductor at each location where the conductor is visible and accessible.
ungrounded
All 15A and 20A, 125V, single-phase receptacles installed in dwelling unit boathouses shall have GFCI protection.
True
Electrical wiring within the cavity of a fire-rated floor-ceiling or roof-ceiling assembly shall not be supported by the ceiling assembly or ceiling support wires.
True
Exothermic or irreversible compression connections, together with the mechanical means used to attach to fireproofed structural metal, shall not be required to be accessible.
True
Receptacles installed for countertop and similar work surfaces as specified in 210.52(C) shall not be considered as the receptacle outlets required by 210.52(A).
True
When IMC is cut in the field, reaming is required to remove the burrs and rough edges.
True
Where a branch circuit supplies continuous loads, or any combination of continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus 125 percent of the continuous load.
True
The receptacle outlet required for indoor electrical service equipment shall not be required to be installed for _____.
one and two family dwellings
Lightning protection system ground terminals _____ be bonded to the building or structure grounding electrode system.
shall
Service conductors shall not be installed beneath openings through which materials may be moved and shall not be installed where they will obstruct entrance to these buildings' openings.
True
For the application of GFCI protection for personnel, when determining distance from receptacles for sinks [210.8(A)(7) and 210.8(B)(5)] and bathtubs or shower stalls [210.8(A)(9)], the distance shall be measured as the _____ path the cord of an appliance connected to the receptacle would follow without piercing a floor, wall, ceiling, or fixed barrier, or passing through a door, doorway, or window.
shortest
Overcurrent protection shall not exceed _____.
30A for 10 AWG copper 15A for 14 AWG copper 20A for 12 AWG copper
Grounded conductors _____ AWG or larger can be identified by distinctive white or gray markings at their terminations.
4
A laundry receptacle outlet shall not be required in each dwelling unit of a multifamily building, if laundry facilities are provided on the premises for all building occupants.
True
Electrical equipment with _____ and having low smoke and heat release properties, and associated wiring material suitable for the ambient temperature can be installed within an air-handling space (plenum).
a nonmetallic enclosure listed for use within an air-handling (plenum) space
When sizing a feeder for the fixed appliance loads in dwelling units, a demand factor of 75 percent of the total nameplate ratings can be applied if there are _____ or more appliances fastened in place on the same feeder.
four
It shall be permissible to ground meter enclosures immediately adjacent to the service disconnecting means to the _____ circuit conductor on the load side of the service disconnect, if service ground-fault protection is not provided.
grounded
Article 200 provides the requirements for _____.
grounded conductors in premises wiring systems identification of grounded conductors identification of terminals
Where it is unlikely that two or more noncoincident loads will be in use simultaneously, only the _____ the loads used at one time is required to be used in computing the total load to a feeder.
largest of
Raceways on exteriors of buildings or other structures shall be arranged to drain and shall be _____ for use in wet locations.
listed and labeled
Supplementary overcurrent protection _____.
may be used to protect internal circuits of equipment
