Year 1 Final (128-135)
What is the minimum trade size EMT required to contain three 1/0 AWG THHN/THWN copper conductors?
1 1/4
Article ___ in the NEC® covers grounding and bonding of electrical systems.
250
Article ___ of the NEC® covers the requirements that establish a grounding electrode system.
250 Part III
According to NEC® Section ___, when a single equipment grounding conductor is run with multiple circuits in the same raceway or cable, it shall be sized for the largest overcurrent device protecting conductors in the raceway or cable.
250.122
Circuits 7 and 9 share a neutral. This is a multiwire branch circuit. If Ckt. 7 is drawing 13 amps and Ckt. 9 is drawing 16 amps, how much current is flowing in the neutral?
3
Article ___ in the NEC® provides requirements for generators.
445
A light switch (the NEC® calls this a "switching device") for underwater swimming pool lights must be located at least ___ feet horizontally from the inside edge of the pool.
5
For indoor installations, wall switches must be kept at least ___ feet, measured horizontally, from the inside edge of the spa or hot tub.
5
For spas and hot tubs in other than single-family dwellings, a clearly labeled emergency shutoff or control switch for the purpose of stopping the motor(s) that provide power to the recirculation system and jet system shall be installed at a point readily accessible to the users and not less than ___ away, adjacent to, and within sight of the spa or hot tub.
5
The Code requires that all electrical equipment within ___ feet of the inside wall of the specified body of water (a pool) be grounded.
5
The NEC® requires that all electrical equipment, located in a fountain or within ___ feet of the inside wall of a fountain, be grounded.
5
If connected to a metal water piping system, the grounding electrode conductor shall be connected at some point within the first ___ of where it enters the building.
5 ft
Generally, safety switches and wall switches must be located at least ___ from the inside edge of a swimming pool.
5'
NEC® Section ___ requirement is that an optional standby system shall be capable of supplying the full load that is transferred by the automatic transfer equipment.
702.4
The Code requires that all metal parts of a pool installation be bonded to a common bonding grid by ___ AWG or larger solid copper wire.
8
___ allow(s) a circuit or electrical system to be sized at less than its maximum connected load.
Diversity
A dwelling unit unfinished area uses 12 AWG NM wiring method and a 20A OCPD. Which of the following receptacles meets the NEC® requirements? I. TR 20A receptacle II. TR 15A receptacle
Either or
Which of these trade size 1/2 inch raceways has the smallest inside diameter? Refer to the appropriate table among those shown in NEC® Chapter 9 - Table 4.
Electrical Nonmetallic Tubing
Terminations of RG-6 cable are made using ___ connectors (or jacks).
F
An underwater pool light can be connected to a 277-volt circuit.
False
Electrical equipment located 7 feet from the inside wall of a pool is required to be grounded.
False
Plug fuses can be used on which of the following voltage systems? I. 120/240-volt, 1-ph, 3-wire II. 120/208-volt, 3Ø, 4-wire III. 277/480-volt, 3Ø, 4-wire
I & II only
Which of the following circuit conditions will cause a circuit breaker to trip? I. short-circuit II. overload III. normal
I & II only
When in a swimming pool, a person may sustain electrical shock by either direct or indirect contact.
True
Without exceptions, all metal parts of an indoor spa or hot tub must be bonded.
True
What is the minimum size Schedule 40 PVC required where sixteen 10 AWG THHN/THWN copper conductors are to be pulled into the conduit
1 1/4
A 120V clothes dryer located in a finished basement laundry room requires the following: I. ground-fault circuit protection II. Arc-fault circuit protection
Both
The number of conductors permitted in 80 PVC is specified in Table ___.
C.10, Annex C
Which of the following are standard size circuit breakers? I. 700 II. 750 III. 800
I & III only
Which of the following are standard size circuit breakers? I. 20 II. 25 III. 30
I, II & III
Which of the following are standard size circuit breakers? I. 55 II. 60
II only
In an office building, Circuit 22 supplies the upper half and Circuit 24 supplies the lower half of a duplex receptacle. These breakers are permitted to be ___. I. two individual single-pole circuit breakers II. two individual single-pole circuit breakers with handle ties III. a two-pole circuit breaker
II or III only
Does the NEC® permit a panelboard to be installed in a clothes closet in a school?
No
When a load calculation results in an ampere rating that does not match the ampacity of the conductor, which of the following is permitted?
Select an OCPD of the next higher standard ampere rating.
What term defines the conductors and equipment required to deliver energy from the electric supply source to the wiring system of the premises?
Service
___ can be described as the point of demarcation between where the serving utility ends and the premises wiring begins.
Service point
When a ground fault occurs, the OCPD will trip very quickly if the fault current has an effective ground-fault current path (a low-resistance return path) to take by way of the equipment grounding conductor. The lower this resistance, the faster the OCPD opens. Which of these ground-fault current return paths has the least (or lowest) resistance where run between two metal boxes? The copper equipment grounding conductor is bonded (or connected) to each box.
a 3/4" EMT with a 12 AWG copper equipment grounding conductor
The grounding electrode conductor shall be ___.
copper, aluminum, or copper-clad aluminum
Home automation controllers that utilize infrared (IR) ___.
. require the receiver to be in sight of the sender
10.05 cents equals $___
.1005
Which of the following is a 3/0 AWG conductor?
000
What is the minimum number of receptacles required in an unfinished basement?
1
When installing any audio/video/data cables, the conductors should be untwisted about ___ inch(es) at the point of termination.
1/2
An intercom speaker must be located at least ___ feet from the inside wall of a swimming pool.
10
Generally, the NEC® permits a fuse to carry ___ percent of its rating when it supplies a load that is not operated continuously.
100
The minimum size service disconnect for a single-family dwelling with a computed load of 10 kVA is ___ amperes
100
Permanently-wired radiant heaters shall be mounted at least ___ feet vertically above the pool deck, unless approved otherwise.
12
Services for one- and two-family dwellings are most often rated ___.
120/240-volt, single-phase, 3-wire
What is the maximum voltage between circuit conductors when using plug fuses?
125
The NEC® requires that all 125-volt and 125/250-volt, single-phase, 15-, 20-, and 30-ampere receptacle outlets that are a part of a ___ kW or smaller portable generator have listed ground-fault circuit-interrupter protection for personnel.
15
The maximum suggested immersion time in a hot tub with a water temperature of 104 degrees Fahrenheit is ___ minutes.
15
What size main electrical panel is shown on the EWR prints?
200-amp
When calculating the size of the required service, you should consult household electric clothes dryer demand factors given in Table ___.
220.54
How many kW does a 100-ampere residential service draw when fully loaded?
24 kW
For purposes of calculating a residential service, the general-purpose lighting load is calculated at ___ per square foot of area.
3 volt-amperes
Trade size ___ is the minimum size RMC (rigid metal conduit) that can contain six each 8 AWG copper THHN/THWN conductors.
3/4
What is the minimum trade size Schedule 80 PVC required to contain four 8 AWG THHN/THWN copper conductors?
3/4
When mounting switches, such as safety switches (disconnects), the NEC® specifies the highest mounting position at ___.
404.8(A)
Cat 5 cable should be installed so that bends are not less than ___ times the diameter of the cable.
4
A 20-amp, 120-volt duplex convenience receptacle near a pool shall be located so that it is ___ feet or more from the inside edge of the pool.
6
Receptacles in a finished basement must be installed such that no point measured horizontally along the floor line of any wall space is more than ____ feet from a receptacle outlet.
6
Electric vehicle charging systems are covered extensively in NEC® Article ___.
625
"The provisions of this article apply to the construction and installation of electrical wiring for and equipment in or adjacent to all swimming, wading, therapeutic, and decorative pools; fountains; hot tubs; spas; and hydromassage bathtubs, whether permanently installed or storable, and to metallic auxiliary equipment, such as pumps, filters, and similar equipment. The term body of water used throughout Part I applies to all bodies of water covered in this scope unless otherwise amended" is a statement shown in Article ___ in the NEC®.
680
Article ___ of the NEC® is the article that gives requirements for swimming pool installations.
680
When swimming pool installations are made, Article ___ in the NEC® provides the requirements for these installations.
680
Section ___ in the NEC® covers bonding of swimming pools.
680.26
Seven 1/0 AWG THHN/THWN copper current-carrying conductors are installed in a conduit. The conduit is installed in an area where the summertime temperature is 152ºF. What is the maximum size OCP permitted to protect the conductors in the conduit?
70
What part of the NEC® is a reference for calculating conduit fill where all conductors are the same size?
Annex C
The neutral conductor for a service must be sized to carry ___. I. the maximum unbalanced current II. the maximum available ground-fault current
Both
Circuit #1 has all conduit fittings tight and the equipment grounding conductor is bonded to each metal box. Circuit #2 has loose conduit fittings and the equipment grounding conductor was not bonded to each metal box. Refer to Scenario 132.31. In the event of a ground fault, the circuit breaker for ___ will open more quickly than the other circuit.
Circuit #1
A(n) ___ AWG grounding electrode conductor is required to be installed in cable armor or conduit when it is NOT subject to physical damage such as where installed behind a flower bed. I. 8 II. 4 III. 3/0
I only
The main bonding jumper (a green bonding screw, for example) that is shipped with and installed in a 120/240-volt, single-phase circuit-breaker panel at the service connects (bonds) the ___ to the metal panel enclosure. I. branch-circuit neutrals II. branch-circuit "hots"
I only
A 15-amp circuit breaker opens very quickly (within 1 second) when subjected to ___. I. a ground fault of 250 amps II. a short circuit of 450 amps III. an overload of 16 amps
I or II only
A dual-element, time-delay fuse opens very quickly when subjected to a(n) ___. I. ground fault II. short circuit III. overload
I or II only
An underwater pool luminaire is permitted to be connected to which of these 2-wire circuits? I. 24-volt II. 120-volt III. 277-volt
I or II only
NEC® 680.2 describes a "permanently installed pool" as ___. I. one constructed in or partially in the ground II. a pool with a water depth greater than 42 in. III. any pool inside of a building
I or II or III
You have a set of plans that requires lighting fixtures (luminaires) to be installed on the ceiling directly above an indoor pool. The ceiling height is 10 feet above the decking around the pool. You should make sure that these fixtures are ___. I. of a totally enclosed type II. connected to a branch circuit that is GFCI protected III. at least 7 ft-6 in above the maximum water level
I, II & III
___ is a type of circuit condition. I. ground fault II. open circuit III. normal
I, II & III
Which of the following is a type of circuit condition? I. selective coordination II. overload
II only
When receptacles that provide power for water-pump motors or for other loads directly related to the circulation and sanitation system are located at least 6 feet and 10 feet from the inside walls of the pool, these receptacles are required to meet which of the following conditions? I. They consist of single receptacles. II. They employ a locking configuration. III. They are of the grounding type. IV. They have GFCI protection.
III & IV only
A standby power system has been installed at a dwelling. The NEC® requires the electrician to place a sign at the service-entrance equipment. What information about the standby power system must appear on the sign?
Location
Using Table 4 in Chapter 9 in the NEC®, which of the following 2 1/2-inch raceways has the smallest cross-sectional area?
Schedule 40 PVC (rigid polyvinyl chloride conduit)
Two 20-amp circuits with a shared neutral are fed from a 120/240-volt, 1Ø panel. If the ungrounded circuit conductors are connected to breakers 1 and 2, which of the following will happen when a 16-amp load is connected to Circuit 1 and a 14-amp load is connected to Circuit 2?
The grounded (neutral) conductor will be overloaded.
What is the result if the neutral wire becomes open on a multiwire circuit having unequal loads?
The load of higher resistance would overheat and probably be damaged
___ shall be suitable for the intended use and shall be listed, designed, and installed so as to prevent the inadvertent interconnection of all sources of supply in any operation of the transfer of equipment.
Transfer equipment
A luminaire, that is located 11 feet above the level of the water in an indoor spa and located directly above the spa, is required to be GFCI protected.
True
All electrical equipment for storable pools is required to be GFCI protected.
True
It is permitted to run normal power conductors and optional standby power conductors in the same raceway or enclosure
True
Panelboards that are not part of the service equipment and that supply any electrical equipment associated with the fountain are required to be grounded.
True
Pool recirculating equipment and pumps are required to be grounded.
True
Splices in Cat 5 cable should not be made.
True
When plug fuses are used on all new installations such as in a disconnect switch for a clothes dryer, the fuses must be ___.
Type S
A disconnecting means (or disconnect switch) for a swimming pool circulation pump must be installed ___. I. at least 5 feet from the inside wall of the pool II. readily accessible III. so that it is visible from the pump
all of these
Carbon monoxide (CO) can cause ___. I. death II. fainting III. nausea
any of these
Raceways ___ required to be completely installed between boxes before pulling in the wires.
are
Home automation controllers that utilize radio frequency (RF) ___.
can send signals through walls
FO cable ___.
contains optical fibers
Cat 5e cable ___.
contains twisted pairs of wire
Optional Standby System transfer switches used with generators can be ____. I. manual II. automatic
either or
When in a swimming pool, a person may sustain electrical shock by ___ contact I. direct II. indirect
either or
An equipment bonding jumper (BJ) is the connection between two or more portions of the ___ conductor.
equipment grounding
Service-entrance conductors must have an ampacity ___ the rating of the service disconnect.
greater than or equal to
The shock hazard to a person in a swimming pool is ___ in comparison to that of a normal touch shock.
higher
Electrical equipment associated with a therapeutic tub ___ required to be GFCI protected.
is
According to Ohm's Law, when all conduit fittings are tight and the equipment grounding conductors are bonded to each metal box, the total resistance of the ground-return path ___. Consequently, when a ground fault occurs, the overcurrent protective device (fuse or breaker) can open as quickly as possible because the fault current is as high as possible.
is decreased
Loads, such as heating and air conditioning, that do not operate at the same time are said to be noncoincident loads. While separate circuits must be designed to serve each load, when calculating service load only the ___ of two noncoincident loads needs to be included.
larger
Not more than one conductor shall be connected to the grounding electrode by a single clamp or fitting unless the clamp or fitting is ___.
listed for multiple conductors
The grounding blade on an attachment plug is ___ than the current-carrying conductor blades. This is to ensure that the grounding connection is made before the current-carrying conductor connections and breaks its connection after the current-carrying conductor connections (first make-last break).
longer
Green main bonding jumper screws that are furnished with residential type panels should be installed in ___.
main panels only
Transfer switches use a ___ to prevent the feedback of electricity between the generator power and the normal utility power.
mechanical interlock
What is the minimum trade size EMT required to contain four 8 AWG THHN/THWN copper conductors?
none of these
Between a 2-pole, 20-Amp circuit breaker and a load, 10 AWG, 2-wire AC cable is installed. If the load is drawing 19 amps, this is a(n) ___ condition.
normal
What is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that the NEC® requires to be installed near a permanently installed pool? The pool is located in your neighbor's backyard.
one
Voltmeters are connected in ___ with the load when used to measure voltage across a load in a circuit.
parallel
When loads such as lamps, motors, and heaters are connected to one circuit of a multiwire branch circuit, these loads are connected in ___.
parallel
Residential standby power system generator is typically ___.
permanently installed
Generally, circuit breakers must be ___.
readily accessible
During a power outage, a standby power system supplied by a cord-connected portable generator ___.
requires a manual or supervised startup
If likely to become energized, interior metal natural gas piping ___ required to be bonded in accordance with NEC® Section 250.104(B)
shall be
A circuit is installed in EMT between a 2-pole circuit breaker and a load. If the "hots" are touched together in a junction box somewhere in the pipe run, this is a(n) ___ condition.
short-circuit
Which term best describes a service lateral?
underground feed
In general, overcurrent protection of conductors is ___.
sized according to the ampacity of the conductor
When calculating residential service load, ___ is allowed for each branch circuit serving laundry receptacles.
1,500 volt-amperes
If a 95-watt lamp operates for 11 hours, the utility will bill for ___ kWh.
1.045
Tests have shown that a voltage gradient of ___ volts per foot can cause paralysis.
1.5
When the corrected ampacity of a 10 AWG copper conductor is 12.86 amps, the maximum size circuit breaker permitted to protect the conductors is ___.
15
There is a total of 29 current-carrying conductors in a conduit. The conduit contains both 10 AWG and 12 AWG THHN/THWN copper conductors. The 10 AWG conductors now have a corrected ampacity of ___ amps.
18
Pools that have nonmetallic inflatable walls are considered to be ___ pools, regardless of their dimensions.
storable
A portable (temporary) generator should be operated outside and in open air because ___.
the exhaust gases are toxic
Tamper-resistant receptacles are required in a dwelling unit basement.
True
The steel walls of a bolted or welded metal pool may be used as a common grid to bond metal parts of a pool and equipment in a pool.
True
Usually, load centers are not available with "bolt-on" circuit breakers.
True
When a swimming pool has a circulation pump, the disconnecting means must be not more than 50' from the pump.
True
Electrical equipment is bonded in order to ___. I. insure electrical continuity in the grounding system II. establish an effective ground-fault-current path to the power source III. permit the OCPD to open quickly in the event of a ground fault
all of these
Electrical systems that are required to be grounded are connected to earth in a manner that will limit the voltage imposed by ___. I. line surges II. lightning III. unintentional contact with higher-voltage lines
all of these
Proper grounding and bonding of all the metal parts in and around a pool area ___. I. assures that all conductive surfaces are at the same ground potential II. reduces the shock hazard to persons III. ensures that OCPDs (circuit breakers and fuses) operate properly in the event of a fault
all of these
When installing a backup generator, an electrician must ___. I. follow the instructions of the manufacturer II. maintain equipment clearances III. be neat and workmanlike
all of these
Home automation systems are ___. I. wireless II. hybrid III. hard wired
any of these
When portable generators are stored until needed by a homeowner or small business owner to operate cord-connected equipment, these are commonly referred to as ___ power sources.
backup
The motor and controller ("open/close" switch) that operates a swimming pool cover is required to be ___. I. at least 5 feet from the inside wall of the pool II. supplied by a GFCI-protected circuit
both
To minimize conductor insulation damage and arcing damage to electrical equipment during a ground fault or a short circuit, ___ should be minimized. I. ampere level of the fault current II. time duration of the fault
both
Which of the following are standard size circuit breakers? I. 125 II. 150
both I & II
Usually, panelboards are constructed to have a depth that is ___ than that of a load center.
deeper
When a tripped breaker is found, you should ___.
determine the cause of the trip and correct it before resetting the breaker
If a circuit breaker trips, you should ___.
determine why it tripped before resetting the breaker
GFCI protection for personnel ___ protect a person against the sensation of feeling a shock.
does not
When a portable generator provides power for frame-mounted receptacles only, the NEC® ___ require the frame to be connected to a grounding electrode.
does not
The NEC® ___ underwater pool luminaires to be connected to a 240-volt circuit.
does not permit
For electrically-operated swimming pool covers, the electric motor and controller shall be connected to a circuit protected by a(n) ___.
ground-fault circuit interrupter
Cat 5e and 6 cables are highly ___ to interference from power wiring.
immune
An air conditioner pulls 23 amps at 240 volts. The electric utility rate is 9.1 cents per kW-hr. The air conditioner "runs" for 8.5 hours each day. The cost to operate the air conditioner for 30 days is ___.
$128.09
From NEC® Table 8 in Ch 9, the overall diameter of a 1/0 bare stranded copper conductor is ___ inches.
.372
The overall diameter (including insulation) of a 250 kcmil THHN/THWN copper conductor is ___ inches at the ?. The conductor shown below is close to its actual size.
.711
HVAC equipment is located in a finished mechanical room in a dwelling unit basement. How many receptacle outlets are required?
1
What is the minimum size LFMC (liquidtight flexible metal conduit) required where sixteen 10 AWG THHN/THWN copper conductors are to be pulled into the conduit?
1
What minimum size Schedule 40 PVC conduit is required where the following conductors are to be installed?
1
A piece of FMC (flexible metal conduit) must be at least a trade size ___ where twelve each 8 AWG THHN/THWN conductors are to be installed.
1 1/4
Trade size ___ is the minimum size Schedule 40 PVC (rigid polyvinyl chloride conduit) that can contain thirteen each 8 AWG copper THHN/THWN conductors.
1 1/4
Service-drop conductors from a 277/480-volt, 3Ø, 4-wire transformer are run over a drive-thru. Trucks cannot enter the drive-thru because of a bar hanging over the entrance. The minimum clearance (or height) above the drive-thru is ___ feet.
12
A short length of EMT is run between two panels. The ampacity values for the conductors in this EMT need not be derated, as long as the length of the EMT does not exceed ___.
24 inches
The Code reference that specifies the type of disconnecting means (circuit breaker for example) that can be used on a multiwire branch circuit that feeds devices mounted on the same yoke [a stack switch or a duplex receptacle for example] is ___.Note: Select N/A ( not applicable) if there is not an NEC® requirement.
240.15(B)(1)
NEC ® Section ___ covers standard size fuses and breakers.
240.6
Service conductors shall have a clearance of not less than ___ feet from windows, doors, or similar locations that open
3
This is a 11/2 trade size RMC with the approximate dimensions. A single 3 AWG THWN/THHN conductor is shown lying inside the conduit. If a run of conduit was made between two pull boxes, the maximum number of these 3 AWG conductors that can be installed in the RMC is ___.
8
A raceway with two, 3-wire branch circuits consists of four ungrounded conductors and two grounded conductors. All of the circuit conductors are current-carrying. The ampacity of these conductors must be based on ___ percent of the ampacity values as found in Table 310.16.
80
Generally, an overcurrent protective device is not permitted to be continuously loaded to more than ___ percent of its rating.
80
A terminal lug on a neutral bar is to be torqued to 110 in-lbs, but your torque wrench is calibrated in foot-pounds. You would set your wrench at ___ ft.-lb.
9.2
If the manufacturer specifies that a terminal lug be torqued to 7.5 foot-lbs but your torque wrench is calibrated in inch-pounds, you would set your wrench at ___ in.-lb.
90
Which of the following locations are required to have GFCI protection for receptacles? I. Unfinished basement II. Finished basement
Both
A breaker panel is permitted to be located ___. I. in the bathroom in a house II. in an electrical room in a school III. in a bathroom in a restaurant
II & III only
A fused switch is permitted to be located ___. I. in the bathroom in a house II. in an electrical room in a school III. in a bathroom in a hotel room
II only
Multiwire branch circuit LA-2,4 is installed using 14-3 AC cable to supply power to two receptacles. The 14-3 cable enters the first receptacle box then 14-2 cable exits this box and continues to the second receptacle box. The NEC® permits the two grounded conductors that enter and exit the first box to be ___. I. directly connected to the terminal screws on the receptacle II. connected together with a wire nut and a pigtail from there to the receptacle terminal screw
II only
According to Table 4 in Chapter 9 in the NEC®, the total cross-sectional area of a 2" FMC is ___ in2.
`3.269
Generally, circuit breakers ___ permitted to be connected to a neutral conductor.
are not
Generally, overcurrent devices ___ permitted to be connected to the grounded circuit conductor.
are not
Self-tapping sheet metal screws (TEK screws) ___ permitted to be used to connect the equipment grounding conductor to a metal box.
are not
The main service disconnect shall be located ___.
at the nearest point of entry of the service conductors.
For billing purposes, the utility uses a watt-hour meter to measure and record ___. I. wattage II. time
both
The battery compartment in an offshore service boat contains ten 18-volt batteries to operate a small crane that requires 90 volts to operate. The ten batteries are connected in ___.
combo series/parallel
To provide accurate protection for prolonged overloads, a dual-element, time-delay fuse will open after about 10 seconds at a current of ___ times the fuse rating.
five
The initial cost of metal halide luminaires is ___ than that of quartz luminaires.
greater
The NEC® has limitations on where OCPDs, such as panelboard installations, can be installed due to the presence of combustible materials. These are specified at ___.
none of these
A multiwire branch circuit from a 120/240-volt 1Ø, 3-wire panelboard will be used to supply power to a double single-pole switch. The NEC® requires that a multiwire branch circuit supplying more than one device or equipment on the same yoke have a means to simultaneously disconnect all ungrounded conductors at the panelboard where the branch circuit originated. This means that ___ can be used to disconnect the circuits from the receptacle.
one two-pole circuit breaker
