228
Water heaters having a capacity of ___ gallons or less shall have a branch-circuit rating not less than 125% of the rating of the water heater.
120
All fixed storage water heaters of 120 gallons or less are required to have a branch circuit over current device and conductor rating of not less than ___ percent of the nameplate rating of the water heater.
125
Fixed electric space heating loads shall be computed at ___% of the total connected load.
125
The disconnecting means and branch-circuit conductors for an electric furnace shall be sized not less than ___ percent of the total nameplate load shown on the furnace.
125
The main service disconnect handle (fused pullout or main breaker) shall not be positioned higher than ___ above the floor.
6 ft-7 in
Twenty-four feet (six 4-ft sections) of track lighting must be installed in a continuous row in a retail store. What is the minimum number of supports required?
7
CØ
Shown above is 42-Circuit Panelboard HB. It is fed from a 277/480-volt, 3Ø, 4-wire utility transformer bank. Circuit number 41 is connected to ___.
AØ
Shown above is 42-Circuit Panelboard L. It is fed from a 120/240-volt, 1Ø, 3-wire utility transformer. Circuit number 42 is connected to ___.
Three-way and four-way switches shall be wired so that all switching is done ___.
only in the ungrounded circuit conductor
Food-waste disposers include a small manual reset button to restart the motor if it overheats and goes off-line due to prolonged use or if something falls into the unit and it jams. This manual reset provides the ___ protection required by Code for this type of appliance.
overload
Luminaires shall not be used as a raceway for circuit conductors unless ___ for use as a raceway. I. listed II. approved III. marked
I & III only
Luminaires that are installed on the outside of an office building under a covered entryway are permitted to be marked as suitable for ___ locations.I. wet II. damp III. dry
I or II only
NEC® 422.60(A) requires that an appliance nameplate show ___.I. the appliance rating in volts and amperesII. the appliance rating in volts and wattsIII. the appliance branch circuit conductor size
I or II only
Electric vehicle cable type EVJ ___.I. is available in sizes 18 AWG to 500 kcmilII. is rated for extra hard usageIII. has thermoset insulation
III only
When raised covers ("industrial covers") are used for receptacles, does the Code permit fastening the receptacle to the cover with just the one center 6/32 screw (as shown)?
No
According to the NEC®, combustible material adjacent to luminaires (fixtures) cannot be subject to a temperature exceeding ___.
90°C
4
Refer to the nameplate shown in Figure 230.128. The branch circuit for the motor is supplied from a 120/240-volt, 3Ø, 4-wire panelboard. What is the minimum size (3 wire + ground) STO cord that could be used as a flexible connection for the motor?
What NEC® Article covers the rules necessary for the installation of appliances?
422
Section ___ of the NEC® states that a central heating system must be supplied by an individual branch circuit.
422.12
A permanently connected dishwasher has a nameplate rating of 780 volt-amperes. The circuit breaker is permitted to serve as the disconnecting means where it is ___.
within sight from the dishwasher or capable of being locked in the open position
According to the NEC®, recessed luminaires (fixtures) that are identified for contact with insulation shall have all recessed parts at least ___ from combustible materials.
0 inches
According to the NEC®, recessed luminaires (fixtures) that are not identified for contact with insulation shall have all recessed parts at least ___ from combustible materials.
1/2 inch
If a protective device rating is marked on an appliance, the branch-circuit overcurrent protection device rating shall not be greater than ___ percent of the protective device rating marked on the appliance.
100
Which of the standard-size disconnect switches listed below would be required for a 240-volt, 15,000-watt furnace? (Assume single-phase.)
100 amperes
Scenario 230-28Motor Nameplate Information: 5 hp 208-230/460-V 3Ø Branch Circuit Supply: 3-pole breaker in a 120/208-V, 3-ph, 4-W panelFor the motor in Scenario 230-28, the minimum size SO cord permitted contains ___ AWG conductors. Select one:
11
A surface-mounted incandescent luminaire (light fixture) mounted in a clothes closet must maintain a clearance of at least ___ inches to the storage area.
12
The largest 1-pole circuit breaker that can be used to protect a 14 AWG copper Type SO flexible cord is ___ A.
15
A luminaire that exceeds ___ inches in any dimension shall not be supported by the screw shell of a lampholder.
16
Fixture wires used for luminaires shall not be smaller than ___ AWG.
18
Flexible cords ___ AWG and larger are used to supply approved appliances and are considered protected from overcurrent by overcurrent devices.
18
The flexible cord for a kitchen food waste disposer shall be at least ___″ in length but can't be longer than ___″.
18 36
What is the maximum allowable ampacity of 14/2 AWG SJT cord?
18 amperes
A 19.7-kW boiler (water heater) is operated at its rated voltage when connected to a 2-pole breaker in a 120/240-volt panel. The smallest copper THHN/THWN conductors permitted to feed this equipment is ___ AWG.
2
Handholes are not required in metal parking lot light poles if the base is hinged and the pole is ___ feet or less in height.
20
No handhole shall be required in a metal pole, supporting a luminaire, that is ___ ft or less in height above grade that is provided with a hinged base.
20
The largest 2-pole circuit breaker that can be used to protect a 12 AWG copper Type SJO flexible cord serving a single-phase load is ___ A.
25
Any branch circuit conductor located within ___″ of a ballast, within a ballast compartment, shall have an insulation rating not lower than 90ºC.
3
The horizontal bathtub zone in which luminaires are not permitted is ___′ from the bathtub rim.
3
Thermal insulation shall not be installed above or within ___ inch(es) of the side of a recessed luminaire. This is a type Non-IC luminaire.
3
Where (snap) switches are installed in multigang boxes without permanent barriers (partitions) the maximum voltage between adjacent switches is ___ volts.
300
For permanently connected appliances rated over ___ volt-amperes or ___ hp, the branch-circuit switch or circuit breaker shall be permitted to serve as the disconnecting means where the switch or circuit breaker is within sight from the appliance or is capable of being locked in the open position.
300 1/8
Lighting tracks that are ___ feet or less in length must be fastened at a minimum of two places.
4
Section ___ of the NEC® states that recessed incandescent luminaires must have thermal protection and must be marked.
410.115(B)
A luminaire that weighs more than ___ pounds must be supported by other than its outlet box.
50
The maximum weight of a luminaire that may be mounted by the screw shell of a brass socket is ___ pounds.
6
What minimum size conductors are required to feed a 12.5 KW, 240-volt electric furnace operated at 240 volts? Size the conductors per 424.3(B). The branch-circuit OCPD is a circuit breaker that is rated for 75°C.
6
A 60-gallon water heater is to be installed to supply hot water to the restrooms in an office building. The water heater is rated for 8.2 KW at 240 volts 1-phase. The minimum size THHN/THWN copper wire that can be installed between the required disconnect switch and the water heater is ___ AWG.
8
The vertical bathtub zone in which luminaires are not permitted is ___′ from the bathtub rim.
8
No hanging luminaire parts can be located within a zone measured ___ ft vertically from the top of the bathtub rim and ___ ft vertically from the top of the shower stall threshold.
8 8
The nameplate for a 15 HP, three-phase motor shows an FLA of 18 amps at 460 volts. What minimum size SOO cord is required to connect the motor to the branch circuit?
9
IV only
A 5-gang box and a partition are shown above in Figure 210.5. The box will contain single-pole switches A, B, C, D & E that are fed from the following circuits that originate in a 277/480-volt, 3Ø, 4-wire panelboard:Switches A and B are fed from Circuit 1Switches C and D are fed from Circuit 7Switch E is fed from Circuit 10The NEC® requires that partitions be installed between switches ___.I. A & B II. B & C III. C & D IV. D & E
408
Article ___ in the NEC® concerns switchboards. A switchboard is shown above in Figure 210.9.
A switchboard is fed from a 3-phase, 4-wire, delta-connected system. The ___ phase shall be the phase having the higher voltage to ground.
B
The NEC® permits a surface mounted luminaire (lighting fixture-such as shown below) to be installed on the ceiling within a shower stall. The shower stall has a 7-foot ceiling.
False
Electrically heated floors in kitchens, bathrooms and hydromassage bathtub locations shall be ___.
GFCI protected
Where a receptacle provides power for an electric drinking fountain, the receptacle is to be ___.
GFCI protected
Luminaires in clothes closets shall be ___. I. surface-mounted or recessed incandescent luminaires or LED with completely enclosed lampsII. surface-mounted or recessed fluorescent luminairesIII. pendant luminaires
I & II only
Wiring devices that are marked with CO/ALR are suitable for use with ___ conductors. I. aluminum II. copper III. copper-clad aluminum
I, II & III
The phase arrangement on 3-phase buses shall be A, B, C from ___, as viewed from the front of the switchboard or panelboard. I. front to back II. top to bottom III. left to right
I, II, and III
Means shall be provided to simultaneously disconnect the ___ of all fixed electric space-heating equipment from all ungrounded conductors. I. heater II. motorIII. motor controllers IV. supplementary overcurrent protective devices
I, III & IV only
either I or II
Refer to Figure 210.19. If the incoming service is 120/208, the NEC® permits the panelboard to be rated for ___ volts.I. 250 II. 600
5
Refer to Figure 210.6, shown above. The conductors connected to the terminal lugs are 350 kcmil. The minimum wire bending space required at I is ___ inches. These lugs are NOT removable.
9
Refer to Figure 210.6, shown above. The conductors connected to the terminal lugs are 350 kcmil. The minimum wire bending space required at II is ___ inches. These lugs are of the lay-in type.
Ampacities for flexible cords are determined using ___ in the NEC®.
Section 400.5
A 120V clothes dryer receptacle located in a finished basement laundry room requires the following:
Tamper-resistant Arc-fault circuit protection
four
The receptacle, shown at II in Figure 211.9, will be installed in a metal box. The box will be connected to the panelboard with PVC. The minimum number of conductors that are required to be pulled into the PVC is ___.
All lighting track must be permanently installed and permanently connected ("hard wired") to a branch circuit.
True
Decorative lighting may be mounted on live vegetation.
True
The NEC® permits a recessed luminaire (lighting fixture-with an enclosed & gasketed trim, listed for wet locations, such as shown below) to be installed in the ceiling within a shower stall. The shower stall has a 7-foot ceiling.
True
Does the NEC® permit a 2-pole circuit breaker to be used as the disconnecting means for a 3.3 KVA, 240-volt, 1Ø air compressor? The equipment is installed in the electrical room with and is within sight of the circuit breaker panelboard.
Yes
Isolated ground receptacles are identified by ___.
an orange triangle
The identification of the grounded conductor in a flexible cord shall be permitted to be by ___.
any color braid with contrasting tracer
GFCI-protected receptacles ___ permitted to be installed within a tub or shower space.
are not
If a common-trip 2-pole breaker is used for a 1Ø, 208-volt circuit, ___.I. both "hots" will open when a short circuit or ground fault occursII. both "hots" can be manually opened
both I and II
Ampacity of fixture wire is determined ___.
from a table in Table 402.5 of the Code
For lighting circuits, NEC® Section 404.2(C) requires a(n) ___ conductor to be provided in each switch box or enclosure.
grounded
A receptacle with a green dot on an ivory face would be a(n) ___ receptacle.
hospital grade
Switches and circuit breakers used as disconnecting means to appliances shall be ___.
indicating type
Luminaires shall be wired with conductors having ___ suitable for the environmental conditions, current, voltage, and temperature to which the conductors will be subjected.
insulation
If an electric water heater is located within sight of the panelboard that supplies it, a disconnect that opens all ungrounded conductors ___ required.
is not
A cover that maintains the weatherproof integrity of the receptacle ___ to be installed when an outdoor receptacle is used for the permanent connection of a cord from a lawn sprinkler system.
is required
Flexible cords and cables shall NOT be ___.
run through holes in walls
Branch-circuit conductors to individual appliances shall not be sized ___ required by the appliance markings or instructions.
smaller than
A wall-mounted luminaire, such as a sconce, that weighs 4 pounds is permitted to be mounted to and supported by a ___.
switch box 4" Sq box with a single-gang plaster ring 4/0 box any of these
Which of the following are permitted to serve as the disconnecting means for a food-waste disposer?
the branch-circuit breaker a wall switch that disconnects the ungrounded conductor a receptacle and cord arrangement any of these
The rating of an individual branch circuit conductors shall not be less than ___ or the marked rating of an appliance having combined loads as provided in 422.62.
the marked rating of the appliance
Type SO cord has ___ insulation.
thermoset
In a 3Ø switchboard that has horizontal busbars, the AØ feeder conductor is connected to the ___ busbar.
top
In general, switches shall be so wired that all switching is done in the ___ conductor.
ungrounded
Flexible cords shall be connected to devices and to fittings so that tension will not be transmitted to joints or terminal screws. This shall be accomplished by ___.
using a special fitting designed for this winding the cord with tape tying a knot in the cord any of these
