Journeyman Electrician Practice Test
What size THWN copper conductors are required to supply a continuous-duty, 25 hp, 208-volt, 3-phase motor, where the motor is on the end of a short conduit run that contains only three (3) conductors, and located where exposed to an ambient temperature of 115 deg. F?
1 AWG
Receptacles supplying power to freestanding-type office furnishings shall be located NOT more than ______ from the furnishing that is connected to it.
1 foot
Where a 15-ampere rated general-use ac snap switch is used as a disconnecting means for an ac motor, the NEC requires the MAXIMUM full-load current rating of the motor to be NO more than _____ .
12 amperes
Branch-circuit conductors supplying a fixed storage-type electric water heater with a capacity of 120 gallons or less, shall have an ampacity of NOT less than _____ of the full-load current of the water heater.
125 percent
What is the MAXIMUM distance permitted between supports of straight runs of threaded trade size 2 in. rigid metal conduit (RMC)?
16 feet
Determine the ampacity of each size 12 AWG 75 deg. C rated copper conductor, where three (3) current-carrying conductors are in a common raceway with an ambient temperature of 125 deg. F.
16.75 amperes
What size aluminum THWN ungrounded (phase) feeder conductors are required to supply a 120/240-volt, single-phase, 200 ampere continuous load? Assume voltage drop and ambient temperature are not a consideration.
350 kcmil
Given: A rigid metal conduit (RMC) to be installed will contain the following three (3) circuits on the load side of the service overcurrent protective devices: two - 150 ampere, 3-phase circuits one - 300 ampere, single-phase circuit The load side equipment bonding jumper for this conduit must be a MINIMUM size of _____ copper.
4 AWG
Where an ac electrical service is supplied with four (4) parallel sets of size 500 kcmil aluminum ungrounded conductors, what is the MINIMUM size copper grounding electrode conductor required when connected to the concrete-encased reinforcing building steel that does not extend on to other types of electrodes?
4 AWG
What size 75ºC copper feeder conductors are required to supply the following group of 3-phase, continuous-duty, 240-volt ac motors? -one (1) 15 hp wound-rotor -one (1) 7½ hp induction-type -one (1) 3 hp induction-type
4 AWG THWN
Given: A single-family dwelling with a 200-ampere, 120/240-volt, single-phase main service panel is being supplied with size 2/0 AWG THW copper ungrounded service-entrance conductors in rigid metal conduit (RMC). The MINIMUM size of the supply side wire-type bonding jumper required for this service-entrance conduit is _____.
4 AWG copper
What is the MAXIMUM length permitted for the flexible cord used to supply an electrically operated in-sink kitchen waste disposer?
36 inches
Where voltage drop and ambient temperature are not a consideration, the conductors used to supply a continuous-duty, 3-phase, 208-volt, 10 hp, Design C, induction type motor are to have an ampacity of at LEAST _____.
38.5 amperes
Floor-mounted Type FCC cable shall be covered with carpet squares NOT larger than _____.
39.37 inches square
In new installations, the MINIMUM working space the NEC requires between a 480/277-volt, wye, switchboard and a 480-volt motor control center where facing each other is _____.
4 feet
Where track lighting is installed in a continuous row, each individual section of NOT more than _____ in length shall be securely supported.
4 feet
Cables installed in electrically heated floors in bathrooms, kitchens, and in hydromassage bathtub locations shall be _____.
GFCI protected
All 125-volt, single-phase, 15- and 20-ampere receptacles installed in residential garages shall be _____. I - protected by a listed arc-fault circuit interrupter II - provided with ground-fault circuit interrupter protection
II only
For an ac system operating at less than 1000 volts, a main bonding jumper shall connect the grounded conductor(s) to _____.
each service disconnecting means enclosure
Where a mobile home has the main service disconnecting means installed outdoors, the disconnecting means shall be installed so the bottom of the enclosure is NOT less than _____ above finished grade.
two feet
According to the NEC, service conductors that supply a building are permitted to pass through the interior of another building _____.
under no circumstances or conditions
Where the motor controller also serves as a disconnecting means, it shall open all _____ conductors to the motor.
ungrounded
Lampholders installed over highly combustible material shall be of the _____ type.
unswitched
Where installed indoors, individual dry-type transformers of more than 112½ kVA rating shall be installed in a transformer room of fire-resistant construction having a MINIMUM fire resistance rating of _____.
1 hour
With the exception of equipment grounding conductors and grounded circuit conductors, individual outside open overhead conductors on insulators, of 600 volts or less, must be covered or insulated when they are WITHIN _____ of a building
10 feet
The spacing required between the bottom of a 600 volt rated switchboard and the noninsulated busbars mounted in the switchboard cabinet is _____ .
10 inches
In a health care facility, low voltage electrical equipment that is likely to become energized that is frequently in contact with the bodies of patients, shall operate on a voltage of _____ or less if the equipment is not approved as intrinsically safe, double-insulated or moisture-resistant.
10 volts
Where a 240-volt, single-phase 90 ampere load is located 225 feet from a panelboard and supplied with size 3 THWN copper conductors; what is the approximate voltage drop on this circuit? (K = 12.9)
10 volts
For emergency systems where internal combustion engines are used as the prime mover, an on-site fuel supply shall be provided with an on-site fuel supply sufficient for NOT less than _____ full-demand operation of the system.
2 hours
All of the following copper conductors are to be installed in an electrical metallic tubing (EMT) ten (10) feet long: 24 - size 10 AWG THHW 10 - size 10 AWG THHN 14 - size 12 AWG THHN Determine the MINIMUM trade size EMT required.
2 in.
In general, where a 20-ampere branch circuit serves a single receptacle outlet, the rating of the receptacle must NOT be less than _____.
20 amperes
Regardless of the applied voltage, or the type of insulation, size 12 AWG copper conductors require overcurrent protection NOT in excess of _____.
20 amperes
For track lighting installed in a retail store, a MAXIMUM of two (2) feet of lighting track or fraction thereof shall be considered _____ .
150 VA
Determine the conductor ampacity where given the following related information: - conductors are size 500 kcmil THWN copper - ambient temperature is 125 deg. F - eight (8) current-carrying conductors are in the raceway
178.2 amperes
Direct-buried cables or conductors located in a trench below two (2) inch thick concrete or equivalent shall have a MINIMUM cover requirement of _____.
18 inches
Enclosures in a Class I, Division 1 location containing components that have arcing devices must have an approved seal located within at LEAST _____ of each conduit run entering or leaving such enclosures.
18 inches
Luminaires mounted in walls of permanently installed swimming pools, shall be installed with the top of the luminaire lens NOT less than _____ below the normal water level of the pool, unless the luminaire is listed and identified for use at lesser depths.
18 inches
Where used outdoors, aluminum grounding electrode conductors shall not be terminated within _____ of the earth.
18 inches
In a dwelling unit bedroom, any wall space that is LEAST _____ or more in width must be provided with a general-use receptacle outlet.
2 feet
Where a 2-gang box contains two (2) single-pole switches, unless the box is equipped with permanently installed barriers, voltage between the switches shall NOT be in excess of _____.
277 volts
Where interlocked armor metal-clad cable (Type MC) is used as a wiring method to minimize the transmission of vibration from a motor, the cable is permitted to be unsupported where the cable is NOT more than _____ in length.
3 feet
When intermediate metal conduit (IMC) is threaded in the field, a standard cutting die with a _____ taper per foot shall be used.
3/4 in.
Where a feeder tap is to be made at a high bay manufacturing building, overcurrent protection at the tap is not required, if the tap conductors are not over 100 feet total length and the tap is made NOT less than _____ from the floor.
30 feet
Shore power for boats shall be provided by single "twist-lock' receptacles rated NOT less than ______.
30 amperes
The MAXIMUM ampacity of an individual branch circuit in a flat conductor cable (FCC) assembly shall be _____ .
30 amperes
What is the MAXIMUM standard size overcurrent protective device that may be used to protect a 30-gallon storage-type water heater with a rating of 4,500 watts, 240-volts, single-phase?
30 amperes
The MAXIMUM unsupported and unsecured length of Type MC cable used to supply a luminaire in an accessible ceiling is permitted to be NOT more than _____ in length.
6 feet
The NEC mandates the MAXIMUM length permitted for a flexible cord supplying a 208-volt, single-phase, room air-conditioner to be _____.
6 feet
Where a single-phase, 125-volt, 15- or 20 ampere rated receptacle outlet is installed in the floor of a meeting room of a hotel, the outlet is required to be located at a distance of NOT less than _____ from any fixed wall.
6 feet
Where switches containing fuses or circuit breakers are used as the main disconnecting means for a building service, they shall be installed such that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is NOT more than _____ above the floor or working platform.
6 feet, 7 inches
Determine the voltage drop on a branch circuit given the following related information: - current = 5 amperes - conductor length = 300 ft. - conductor resistance = 4 ohms per 1,000 feet
6 volts
When installing wiring for sensitive electronic equipment, the MAXIMUM voltage to ground is required to be _____.
60 volts
Armored cable (Type AC) installed horizontally through wooden or metal framing members is considered supported where the support doesn't exceed _____ intervals.
4½ feet
What is the MAXIMUM distance allowed between supports by staples, straps or hangers when installing nonmetallic sheathed cable (NM)?
4½ feet
In general, flexible metal conduit (FMC) shall be secured by an approved means at intervals NOT exceeding _____ and within at LEAST _____ of every outlet box, panelboard, conduit body or other conduit termination.
4½ feet - 12 inches
What percent of electrical supplied spaces in a recreational vehicle park must be equipped with at least one (1) 30-ampere 125-volt receptacle outlet?
70 percent
Where Type UF cable is installed as a substitute wiring method for NM cable, the conductor insulation shall be rated for _____.
90º C
Which of the following listed conductor insulations is oil resistant?
MTW
Where underground installed service conductors emerge from grade and extend up a pole, they are to be protected by enclosures or raceways to a point at least 8 feet above grade. Where the raceway is subject to physical damage, a type of raceway NOT approved for such use is _____.
Schedule 40 PVC conduit
Where rigid metal conduit (RMC) or intermediate metal conduit (IMC) is threaded in the field and corrosion protection is necessary, the threads shall be coated with a/an _____ compound.
approved electrically conductive, corrosion resistant.
GFCI protection is required for _____ provided for public use. I - automotive vacuum machines located at car washes II - tire inflation machines located at convenience stores
both I and II
In a commercial garage work area, which of the following receptacles, if any, are required to have GFCI protection? I - 15-ampere general-purpose receptacles for hand tools and portable lighting equipment. II - 20-ampere receptacles serving electrical diagnostic equipment only.
both I and II
In general, when grounded or ungrounded conductors are installed in parallel, (electrically joined at both ends) the paralleled conductors in each phase shall _____. I - be the same size in circular mil area II - have the same insulation type
both I and II
The critical branch of the hospital essential electrical system shall provide power to all the operating rooms and all _____. I - emergency room treatment areas II - nurses' stations
both I and II
The continuity of the grounding system for portable electrical carnival equipment shall be verified _____ .
each time the equipment is connected
In general, the disconnecting means for an air-conditioning unit _____.
shall not be located on panels of the A/C unit that are designed to allow access to the unit
All 125-volt, single-phase, 15- and 20-ampere receptacle outlets installed in the following listed locations of dwelling units, shall be provided by a listed ground-fault circuit interrupter EXCEPT _____.
hallways
A listed _____ shall be installed in or on all emergency systems switchboards and panelboards.
surge protective device (SPD)
In general, battery back-up exit luminaires (unit equipment) shall receive power from _____.
the branch circuit serving the normal lighting in the area
In Class II, Division 1 locations, an approved method of connection of conduit to boxes or cabinets is _____ .
threaded bosses
Unless specifically permitted in the NEC, neutral conductors shall NOT be used for more than one_____.
- branch circuit - multiwire branch circuitc. - set of ungrounded feeder conductors
For the purpose of determining conductor fill in conduit, what is the total area, expressed in square inches, for the following combination of conductors? three - size 4/0 AWG THWN one - size 3/0 AWG THWN one - size 4 AWG THWN
1.3214 square inches
A 120/240-volt, single-phase feeder of a retail department store is to supply a noncontinuous load of 18,000 VA and a continuous load of 13,356 VA. What MINIMUM size 75 deg. C copper conductors are required for this installation?
1/0 AWG
A size 2 AWG copper conductor having a temperature rating of 75 deg. C has an ampacity of _____ when installed in an area where the ambient temperature is expected to reach 100 deg. F
101 amperes
In regard to new outdoor installations of permanently installed swimming pools, luminaires installed above the pool or within 5 feet horizontally from the inside wall of the pool, shall be installed at a height of NOT less than _____ above the maximum water level of the pool.
12 feet
Given: Type UF cable is to be used for direct buried residential branch circuits of 120-volts. The conductors are GFCI protected and overcurrent protection is rated 20-amperes; the cables do not cross under any driveways or concrete. What is the MINIMUM permitted burial depth of the cable?
12 inches
Determine the MAXIMUM number of 125-volt, general-purpose receptacles the NEC permits to be protected by a 20-ampere, 120-volt, single-pole inverse time circuit breaker in a commercial occupancy.
13
Wire-type equipment grounding conductors for solar photovoltaic source and PV output circuits shall NOT be smaller than _____.
14 AWG
Class 3 single conductors shall NOT be smaller than _____.
18 AWG
Determine the largest trade size raceway permitted to be installed in a junction box given the following related information: - junction box is 12 inches in length - conductors are size 4 AWG - a straight pull of the conductors is to be made
1½ in.
For the purpose of determining box fill, size 12 AWG THWN copper conductors are to be calculated at ____ per grounded or ungrounded conductor.
2.25 cubic inches
Circuits that supply outline lighting systems containing incandescent luminaires shall be rated NOT to exceed _____.
20 amperes
Given: A straight pull of size 4 AWG and larger conductors is to made in a junction box that will have a trade size 3 in. conduit and two (2) trade size 2 in. conduits entering on the same side and exiting on the opposite wall. No splices or terminations will be made in the box. Which of the following listed junction boxes is the MINIMUM required for this installation?
24 in. x 24 in.
As a general rule, in the kitchen of a dwelling unit, at least one 15- or 20-ampere, 125-volt, receptacle outlet shall be installed so that no point along the wall line on countertops and work surfaces is more than _____ measured horizontally from a receptacle outlet in that space.
24 inches
Unless specifically identified for a higher percentage of fill, the cross-sectional area of the conductors or optical fiber tubes in a conduit seal, in Class I, Divisions 1 and 2 locations, shall NOT exceed _____ of the cross-sectional area of a rigid metal conduit (RMC) of the same trade size.
25 percent
When a building has a 208Y/120-volt, 3-phase, 4-wire service with a balanced net computed load at 90 kVA, determine the current each ungrounded (phase) conductor will carry at full-load.
250 amperes
Ceiling-suspended (paddle) fans, cord or pendant connected luminaires, and track lighting are not permitted to be located in a zone measured _____ horizontally from the top of a bathtub rim or shower stall threshold.
3 feet
In general, electrical metallic tubing (EMT) shall be securely fastened within _____ of each junction box, panelboard, or other conduit termination.
3 feet
When an inverse-time circuit breaker is used as the disconnecting means for a 20 hp, 480-volt, 3-phase, continuous-duty motor, the circuit breaker shall have an ampere rating of at LEAST _____.
31.05 amperes
Apply the general method of calculation and determine the demand load, in VA, for a one-family dwelling having a total connected load of 96,400 VA for the general lighting, small appliance and laundry loads.
35,690 VA
A 30 hp, 480-volt, 3-phase wound-rotor, ac motor has a full-load running current rating of ____.
40 amperes
When exceptions are not a consideration, branch-circuit conductors supplying residential electric ranges of 8.75 kW or more in rating shall be rated at LEAST _____.
40 amperes
Where a conduit or tubing longer than 24 inches contains two (2) ungrounded conductors, one (1) grounded conductor and one (1) equipment grounding conductor, the conduit is permitted to be filled to a MAXIMUM of_____ of its cross-sectional area.
40 percent
A 240-volt, 10 kW, single-phase commercial dishwasher has a full-load current rating of _____.
42 amperes
Standard trade size 2 in. rigid Schedule 40 polyvinyl chloride conduit (PVC), shall be supported at LEAST every _____.
5 feet
The MINIMUM distance permitted from wall switches to the inside walls of an indoor installed spa or hot tub shall be _____.
5 feet
Determine the MINIMUM size THWN copper branch-circuit conductors required by the NEC to supply one 40 hp, 480-volt, continuous duty, 3-phase, induction-type, Design C, motor.
6 AWG
A one-family dwelling it to have the following fastened in place appliances installed: -1,200 VA dishwasher -4,000 VA water heater -1,150 VA garbage disposer -700 VA attic fan -1,920 VA garage door opener The demand load, in VA, on the ungrounded service-entrance conductors for the listed appliances is _____ when applying the general method of calculations for dwellings.
6,728 VA
Apply the general method of calculation for dwellings and determine the demand load, in kW, on the service-entrance conductors for one (1) household 8 kW rated electric range.
6.4 kW
Household-type appliances with surface heating elements having a MAXIMUM demand of more than _____ shall have its power supply subdivided into two (2) or more circuits.
60 amperes
For one-family dwellings and each unit of a two-family dwelling, at least one 125-volt, single-phase, 15- or 20-ampere receptacle outlet readily accessible from grade and NOT more than _____ above grade level shall be installed at the front and back of the dwelling.
6½ feet
When bonding the structural reinforcing steel of a swimming pool, what is the smallest wire-type size bonding conductor permitted for this installation?
8 AWG
When exceptions are not to be taken into consideration, what are the smallest size copper conductors permitted for use as overhead service-drop conductors?
8 AWG
Where an ac transformer arc welder has a 50-ampere rated primary current and a 60 percent duty cycle, determine the MINIMUM size copper 60 deg. C rated conductors required to supply this welder.
8 AWG
A driven ground rod is required to be driven a MINIMUM depth of _____ into the earth.
8 feet
The transformer oil used in transformers acts as:
Both insulating material and coolant
A disconnect switch enclosure installed in a Class II, Division 2 location shall be listed as _____.
Dustthight
Class _____ locations are those that are hazardous because of the presence of easily ignitable fibers or where materials producing combustible flyings are handled, but in which such fibers/flyings are not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures.
III
Which of the following circuits is prohibited for the grounded conductor to be dependent on receptacle devices for continuity?
Multiwire branch circuits.
Which one of the following listed cables has an overall covering that is fungus resistant?
Type NMC
As a general rule, where conductors carrying alternating current are installed in ferrous metal raceways, _____.
all phase conductors, the grounded conductor and equipment grounding conductors shall be grouped together
The use of UF cable is prohibited by the NEC if used _____.
as service cable
Type AC cable shall be permitted _____.
for feeders
In all childcare facilities, all nonlocking-type, 125-volt and 250-volt, 15- and 20-ampere receptacles, shall be _____.
listed tamper-resistant
Receptacles that are located within the patient rooms, bathrooms, playrooms and activity rooms of pediatric wards in a health care facility shall be _____ or shall employ a listed tamper-resistant cover.
listed tamper-resistant
Which of the following is NOT permitted for use as a grounding electrode?
metal underground gas pipe
When splicing existing underground service conductors to extend to a new service location, the NEC requires _____ . I - the use of splice boxes II - the conductors to be protected with a covering of at least two (2) inches of concrete
neither I nor II
When sizing time-delay Class CC fuses for motor branch-circuit, short-circuit and ground-fault protection, they are to be sized at the same value as _____ .
nontime-delay fuses
Which of the following is NOT required to be marked on the nameplate of a transformer?
overcurrent protection
When a retail furniture store has 80 continuous linear feet of display show window, the NEC mandates at LEAST _____ receptacle outlets be provided within 18 inches of the top of the show window for the show window lighting.
seven
Grounding conductors and bonding jumpers shall NOT be connected by _____.
sheet metal screws
A premises wiring system supplied by a grounded ac electrical service, shall have a grounding electrode conductor connected to _____ .
the grounded service conductor
Where flexible cord is approved for and used with a specific appliance, it shall be considered to be protected _____.
when applied within the appliance listing requirements
Branch-circuit conductors supplying more than one motor shall have an ampacity of at LEAST_____ of the full-load current rating of the highest rated motor in the group, and 100 percent of the full-load current rating of the other motor(s) in the group.
125 percent
A 208-volt, 3-phase, 50 hp, squirrel-cage, continuous-duty, ac motor has a full-load running current rating of _____.
143 amperes
All 125-volt, single-phase, 15- or 20-ampere receptacle outlets installed within at LEAST _____ of the outside edge of a dwelling unit bathtub or shower stall require GFCI protection.
6 feet
When connecting to luminaires, trade size 3/8 in. flexible metal conduit (FMC) is permitted to enclose tap conductors, provided the length of the FMC does NOT exceed _____.
6 feet
Where a pull box to be installed will contain conductors of size 4 AWG and larger, and a straight pull of the conductors is to be made, the length of the box shall NOT be less than ____times the trade diameter of the largest conduit entering the box.
Eight
The NEC defines a continuous load to be a load where the maximum current on the circuit is expected to continue for at LEAST____ hours or more.
Three
Which of the following quantity is the same in a series electrical circuit:
Electrical current
Electrical Generator works on the principle of:
Flemings Right hand rule
In a health care facility, a patient bed location in a critical care (Category 1) space is required to have which of the following?
Fourteen single receptacles or seven duplex receptacles.
Class _____ hazardous locations are those in which flammable liquid-produced vapors, or combustible liquid-produced vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures.
I
Conductors with ______ insulation have a greater ampacity when used in a dry location compared to when used in a wet location.
THHW
When determining the required ampacity of the branch-circuit conductors to supply a 3-phase, continuous-duty ac motor, current values given on _____ shall be used.
Table 430.250 of the NEC
According to the NEC, what are the three (3) mandatory separate branches of the hospital Type 1 essential electrical systems?
The life safety branch, the critical branch and the equipment branch.
The NEC states each building or other structure shall have only one disconnecting means unless _____.
The multiple disconnecting means consists of no more than six, and are housed in separate enclosures with a main service disconnecting means in each enclosure.
Which of the following listed types of storage batteries is NOT permitted for use as a source of power for emergency systems?
automotive
The purpose of an intersystem bonding termination is to provide a means for connecting _____ to the grounding electrode system.
bonding conductors for communications systems
In dwelling units, all 125-volt, single-phase, 15- or 20-ampere receptacle outlets installed within six (6) feet of the outside edge of a sink in a laundry room shall be provided with _____.
both GFCI protection and AFCI protection
All motors shall be considered as _____ unless the nature of the apparatus it drives is such that the motor will not operate continuously.
continuous duty
A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected to, is recognized as a _____ in the NEC.
controller
In an underground installed rigid polyvinyl chloride conduit (PVC) system that consist of 50 feet length between pulling points, what is the MAXIMUM number of bends this run may have?
four (4) - 90 degree
Where size 14 AWG branch-circuit conductors protected by a 15-ampere rated circuit breaker supplies three (3) 20-ampere rated duplex receptacles, this branch circuit _____ .
is not in compliance with the NEC because the receptacles have a 20-ampere rating
In regard to residential occupancies, the branch-circuits supplying 125-volt, single-phase, 15- or 20-ampere receptacles in a garage _____.
is permitted to supply readily accessible outdoor receptacles
What is the MAXIMUM number of times a grounding electrode conductor is permitted to be spliced by use of listed split-bolt connectors?
none
Three-way and four-way switches shall be wired so that all switching is done _____.
only in the ungrounded circuit conductor
A single-gang (cover), 1¾ in. deep, Type FS box is permitted to house no more than _____ size 12 AWG conductors.
six
Which of the following is permitted in the dedicated electrical space above an indoor installed 3-phase, 480Y/277-volt panelboard?
sprinkler protection
At the time of installation, grounded (neutral) conductors larger than size 6 AWG may be identified at its terminations by _____ colored phase tape.
white
A single-phase, 125-volt receptacle installed to serve a washing machine in the laundry room of a dwelling unit must be installed within at LEAST ______ of the intended location of the appliance
6 feet
Conduit or tubing nipples not over 24 inches in length may be filled to a MAXIMUM of _____ of their cross-sectional area.
60 percent
When terminating conductor sizes 14 AWG through 1 AWG on circuit breakers, the conductors shall be considered to have a temperature rating of ______, unless the circuit breakers are listed and marked otherwise.
60ºC
A single-phase, 240-volt, 15 kVA standby generator may be loaded to a MAXIMUM of _____ per line.
62.50 amperes
Which of the following receptacle outlets in a commercial kitchen are required by the NEC to be GFCI protected?
All single-phase, 125-volt through 250-volt receptacles rated 50 amperes or less.
Where a size 4 AWG or larger conductor enters a panelboard, which of the following must be provided?
An insulated bushing.
Where an automotive vacuum machine is accessible, supplied by a 120-volt, 20-ampere branch circuit, and located for public use, it shall be provided with _____ protection.
Class A GFCI
In general, which of the following MUST be provided at a patient bed location used for general care, (Category 2) spaces in a hospital?
-A circuit on the normal system -A circuit on the critical branch. -"Hospital-grade" receptacles.
Disregarding exceptions, all 3-phase, 4-wire, 480Y/277-volt, electrical services, require ground-fault protection for each service disconnecting means when rated for at LEAST _____ or more.
1,000 amperes
In general, cables or raceways shall be permitted to be laid in notches in wood studs where the cable or raceway at those points is protected against nails or screws by a steel plate at LEAST _____ thick.
1/16 in.
Given: A rooftop run of electrical metallic tubing (EMT) with compression type fittings enclosing size 6 AWG ungrounded conductors is the wiring method used to supply a rooftop air-conditioning unit that is protected by an overcurrent protective device rated 60 amperes. What is the MINIMUM size wire-type copper equipment grounding conductor required to be installed in the EMT with the circuit conductors?
10 AWG
What is the MINIMUM size wire type equipment grounding conductor for a 50 ampere branch circuit as required by the NEC?
10 AWG
What is the MINIMUM size wire-type equipment grounding conductor required for a 5 hp, 3-phase, 208-volt motor having 20-ampere rated overload protection and branch-circuit, short-circuit and ground-fault protection rated 30-amperes?
10 AWG
At the electrical service provided for a residence, the service-drop conductors shall have a MINIMUM clearance from final grade of _____.
10 feet
In dwelling units, hallways of _____ or more in length shall be provided with at least one 125-volt, single-phase, general-use receptacle outlet.
10 feet
Circuit breakers rated _____ or less and 1000 volts or less shall have the ampere rating molded, stamped, etched or similarly marked into their handles or escutcheon areas.
100 amperes
Determine the MAXIMUM overcurrent protection permitted for size 14 THWN copper motor control circuit conductors tapped from the load side of a motor overcurrent protection device. Given: the conductors require short-circuit protection and do not extend beyond the motor control equipment enclosure.
100 amperes
The optional method of calculation for dwelling units is reserved for dwelling units with a demand load of at LEAST _____ or more.
100 amperes
The service equipment for a mobile home shall be rated NOT less than _____, 120/240 volts, single-phase.
100 amperes
The emergency controls, such as shutoff devices or electrical disconnects, for attended self-service gasoline stations or convenience stores with motor fuel dispensing facilities must be located NOT more than _____ from the motor fuel dispensers.
100 feet
A fused disconnecting means for motor circuits rated 1000 volts or less, shall have an ampacity of at LEAST _____ of the full-load current rating of the motor it disconnects.
115 percent
The ampacity of phase conductors from the generator terminals to the first overcurrent device shall NOT be less than _____ of the nameplate current rating of the generator where the design of the generator does not prevent overloading.
115 percent
Continuous-duty motors, rated more than 1 hp, with a service factor of less than 1.15, shall have the MINIMUM running overload protection sized at _____ of the motor nameplate full-load ampere rating, or may have the MAXIMUM running overload protection sized at no more than _____ of the nameplate FLA rating of the motor.
115% - 130%
In Class II, Division 1 locations, where pendant mounted luminaires are suspended by rigid metal conduit (RMC) or intermediate metal conduit (IMC) and a means for flexibility is not provided, the conduit stems shall have a length of NOT more than _____.
12 inches
Liquidtight flexible metal conduit (LFMC) shall be securely fastened WITHIN _____ of each box or other conduit termination.
12 inches
Determine the ampacity (current-carrying capacity) of four (4) size 1/0 AWG THW copper current-carrying conductors installed in a common raceway with an ambient temperature of 86 degrees F.
120 amperes
Determine the ampacity of a size 1/0 AWG THW copper conductor installed in a common raceway with three (3) other current carrying conductors of the same size and insulation where the ambient temperature is 86 deg. F.
120 amperes
What is the MAXIMUM voltage permitted between branch-circuit conductors supplying luminaires in a residence or guest rooms of hotels and motels?
120 volts
In general, branch circuit conductors supplying continuous loads, such as fluorescent luminaires in an office building, school classroom, or retail shopping mall, shall have an ampacity of NOT less than _____ of the load.
125 percent
The branch-circuit conductors supplying fixed electric space-heating equipment and any associated motors shall be sized not smaller than _____ of the load.
125%
Determine the MINIMUM number of 20-ampere, 120-volt general lighting branch circuits required for a 12 unit apartment building that is 12,000 sq. ft. in size. The apartment building is designed for permanent residents and does contain cooking facilities.
15
Information technology equipment shall be permitted to be connected to a branch circuit by a listed power-supply cord having a length NOT to exceed _____.
15 feet
A disconnecting means shall be provided on the supply side of all fuses in circuits having a voltage of at LEAST _____ to ground.
150 volts
Given: A transformer is to be fed with four (4) parallel size 500 kcmil conductors per phase. The conductors will enter the enclosure on the opposite wall of the terminals. What is the wire-bending space required for the conductors?
16 inches
Determine the conductor ampacity when given the following related information and conditions: -ambient temperature of 44 deg. C -250 kcmil THWN copper conductors -four (4) current-carrying conductors are in the raceway -length of raceway is 25 feet
167 amperes
Before demand factors are taken into consideration for commercial buildings, general-purpose receptacle loads are to be computed at NOT less than _____ per outlet.
180 VA
Determine the MINIMUM trade size electrical metallic tubing (EMT) required to enclose eight (8) size 6 AWG copper conductors with THHW insulation when installed in a 50 ft. conduit run.
1¼ in.
Determine the MINIMUM trade size electrical metallic tubing (EMT) required to enclose eight (8) size 6 AWG copper conductors with THHW insulation, when installed in a 50 foot conduit run.
1¼ in.
When installing Type NM cable through bored holes in wooden studs, the holes shall be bored so that the edge of the hole is NOT less than _____ from the nearest edge of the wood member, unless the cable is protected by a steel plate.
1¼ in.
Storage batteries for legally required standby systems shall have the capacity to maintain not less than 87½ percent of the system voltage of the circuits supplying the legally required standby power for a period of at LEAST _____ upon loss of the normal power.
1½ hours
Where electrical metallic tubing (EMT) is installed under metal-corrugated sheet roof decking, the EMT shall be installed so there is NOT less _____ clearance measured from the lowest surface of the roof decking material to the top of the raceway.
1½ in.
What is the MINIMUM size copper SE cable with type THHW insulation that may be used as ungrounded (phase) service-entrance conductors for a 150-ampere calculated demand load, 120/240-volt, single-phase residential service?
2 AWG
All 15- or 20-ampere, single-phase, 125-volt through 250-volt receptacles located within at LEAST _____ of the edge of a decorative fountain shall be provided with GFCI protection for personnel.
20 feet
Where a grounding ring consist of size 2 AWG bare copper wire encircling a building, buried 36 inches, in direct contact with the earth, what is the MINIMUM length of the wire permitted for the grounding electrode in this ground ring?
20 feet
Where 125-volt, 15- or 20-ampere receptacle outlets are installed for countertop portable appliances in dwelling unit kitchens, the outlets must be located above, but NOT more than _____ above the countertop or work surface.
20 inches
When conductors are installed in a conduit or tubing nipple of _____ or less in length, the ampacity adjustment factors for more than three (3) current-carrying conductors in the raceway are not required to be applied.
24 inches
Given: A 208-volt, single-phase, continuous-duty motor has the following information marked on the nameplate: FLA 18 amperes, temp. rise 40°C, and service factor 1.15. The initial value of the overload protective devices selected does not permit the motor to start and run without tripping. What is the absolute maximum rating or setting permitted for the overloads?
25.2 amperes
Where transformer vaults are not protected with an automatic fire-suppression system, they shall be constructed of approved materials that have a MINIMUM fire-resistance rating of _____.
3 hours
Where conduits enter a floor-standing switchboard or panelboard at the bottom, the conduits, including their end fittings, shall NOT rise more than _____ above the bottom of the enclosure
3 inches
For temporary wiring installations at a construction site that have an assured equipment grounding conductor program, all required tests shall be performed at intervals NOT exceeding _____.
3 months
Where an ac service is supplied with four (4) parallel sets of size 500 kcmil aluminum conductors, what is the MINIMUM size copper grounding electrode conductor required, when connected to a metal underground water line used as the grounding electrode system? Assume the grounding electrode conductor also extends to other types of electrodes.
3/0 AWG
Plate grounding electrodes shall be installed NOT less than _____ below the surface of the earth.
30 inches
The required width of the working space in front of panelboards, switchboards, disconnects and motor controllers, shall be the width of the equipment or _____ whichever is greater.
30 inches
When driving a ground rod and solid rock is encountered, the ground rod is permitted to be buried in a trench at LEAST _____ deep.
30 inches
Unless exceptions are a consideration, where feeder conductors of not more than 1000 volts supply a continuous load of 240 amperes, the conductors are required to have an ampacity of at LEAST _____.
300 amperes
Where exceptions are not applicable, when a feeder supplies a continuous load of 240 amperes, the overcurrent protection device protecting this circuit shall have a rating of at LEAST _____.
300 amperes
Given: A 20 ft. feeder tap for lighting has an ampacity of 150 amperes.What is the MAXIMUM ampere rating permitted for an overcurrent protection device protecting the conductors from which they are tapped?
450 amperes
Determine the ampacity of a 3-conductor size 6 AWG XHHW aluminum SER cable installed in the attic of a one-family dwelling where the ambient temperature is 44 degrees C.
47.9 amperes
Where a submersible pump is located in a pond of a water treatment plant, the on land service equipment for the pump shall be NO closer than _____ horizontally from the shoreline.
5 feet
Where applying the general method of calculation for dwelling units, the load for household electric clothes dryers shall be a MINIMUM of _____ or the nameplate rating, whichever is larger, for each clothes dryer served.
5,000 watts
Where a trade size 1/2 in. rigid metal conduit (RMC) is installed in a Class I location and a 1/2 in. conduit seal is required, the MINIMUM thickness of the sealing compound shall NOT be less than _____.
5/8 in.
A dry-type transformer of less than 1000 volts and _____ is permitted to be installed in a hollow space of a building, such as above an accessible lift-out ceiling, provided there is adequate ventilation.
50 kVA
A luminaire shall be supported independently of the outlet box where it weighs MORE than _____ unless the outlet box is listed for the weight to be supported.
50 pounds
Equipment supplied by Class 1 circuits such as fire alarm, control, and signaling circuits shall be grounded, UNLESS operating at less than _____ .
50 volts
For capacitors of over 1000 volts, a means shall be provided to reduce the residual voltage of a capacitor to _____ after the capacitor is disconnected from the source of supply.
50 volts or less within 5 minutes
Determine the initial rating or setting, in amperes, of the overload relays required for protecting a 3-phase, 208-volt, 15 hp, continuous-duty, induction-type motor. The motor nameplate is marked with: 45 FLA, temp. rise 38°C and service factor 1.15. Assume the value you select is sufficient to start the motor and carry the load and modification of this value is not necessary.
56.25 amperes
A bonding jumper connected between the communications grounding electrode and power grounding electrode system at the building or structure service where separate electrodes are used shall NOT be smaller than size _____ copper.
6 AWG
When two (2) ground rods are bonded together, the wire-type grounding conductor that bonds the two rods together shall NOT be required to be larger than size _____ copper, regardless of the size of the service-entrance conductors.
6 AWG
All 125-volt, single-phase receptacles not exceeding 30 amperes located at LEAST within _____ measured horizontally of the inside wall of a hydromassage tub shall be protected by a ground-fault circuit interrupter.
6 feet
In pull boxes or junction boxes having any dimension over _____, all conductors shall be cabled or racked up in an approved manner.
6 feet
Where exposed Type NM cable passes through a floor, the cable shall be enclosed in an approved conduit extending at LEAST _____ above the floor.
6 inches
What is the MAXIMUM overcurrent protection allowed for the protection of resistance-type electric space heating equipment?
60 amperes
What is the general lighting demand load on the service, in VA, of an industrial commercial (loft) building having dimensions of 100 feet by 300 feet?
66,000 VA
Given: A branch circuit is to supply the following continuous-duty ac motors from a motor control center: motor #1 - FLC = 10 amperes motor #2 - FLC = 20 amperes motor #3 - FLC = 30 amperes The circuit conductors are required to have an ampacity of at LEAST _____.
67.5 amperes
A 20-ampere, 120-volt load is located 150 ft. from a panelboard and is supplied with size 10 AWG copper branch-circuit conductors with THWN-2 insulation. What is the approximate voltage drop on the conductors? (K = 12.9)
7.5 volts
Where an 80 ampere, 240-volt, single-phase load is located 200 feet from a panelboard and is supplied with size 3 AWG copper conductors with THWN insulation, what is the approximate voltage drop on this circuit? (K = 12.9)
7.84 volts
Where an 80-ampere, 240-volt, single-phase load is located 200 feet from a panelboard and is supplied with size 3 AWG copper conductors with THWN insulation, what is the approximate voltage-drop on the circuit? (K = 12.9)
7.84 volts
A single-phase, 120/240 volt, 18 kW rated home standby generator has a full-load current rating of _____ .
75 amperes
Which one of the following listed inverse-time circuit breakers is NOT a standard ampere rating as per the NEC?
75 amperes
Splices and taps are permitted in a metal wireway provided they are accessible and do not fill the wireway to more than ____ of its area at that point.
75 percent
When calculating the service-entrance conductors for a farm service, the second largest load of the total load, shall be calculated at _____ .
75 percent
Direct-buried conductors emerging from grade shall be protected by raceways or covers up to at LEAST _____ above finished grade
8 feet
In general, overhead (aerial) communications wires, cables and CATV type coaxial cable, shall have a vertical clearance of NOT less than _____ from all points above roofs which they pass.
8 feet
Where a 240-volt, single-phase, residential branch-circuit using copper Type NM cable supplies both, an 8 kW rated counter-mounted cooking unit and a wall-mounted oven rated 6 kW, what size Type NM cable is required?
8/3 with ground
Given: You have determined a conductor has a computed ampacity of 75 amperes. What is the MAXIMUM standard ampere rating of the overcurrent protection device the NEC permits to protect this circuit where this is not a motor circuit or part of a multioutlet branch circuit supplying more than one receptacle?
80 amperes
When a conductor has a computed ampacity of 75 amperes, the MAXIMUM standard ampere rating of the overcurrent protection device the NEC permits to protect this circuit is rated _____ if this is not a motor circuit or part of a branch circuit supplying multiple receptacles.
80 amperes
When ambient temperature is not a factor, a size 8 AWG single copper conductor with type FEPB insulation, installed in free air, will have a MAXIMUM allowable ampacity of _____.
80 amperes
Where a vertical raceway contains four (4) size 3/0 AWG copper conductors, the conductors shall be supported at intervals NOT greater than _____.
80 feet
Determine the ampacity of a size 3 AWG THHN copper conductor given the following related information: - Three (3) current-carrying conductors are in the raceway. - The ambient temperature is 35 deg. C. - The terminations are rated at 60 deg. C
85.0 amperes
Given: You are to install a back-up generator with a rating of 18 kW, 120/240-volts, single-phase, at a farmhouse. Where the design and operation of the generator does not prevent overloading, the ampacity of the conductors from the generator terminals to the first overcurrent protective device must be at LEAST _____.
86 amperes
Given: You are to install a transformer to supply a 208Y/120-volt, 3-phase, 243 ampere load. The transformer must have a kVA rating of at LEAST _____.
87½ kVA
In industrial establishments, where sizes 1/0 AWG through 4/0 AWG single conductor cables are installed in ladder type cable tray, the MAXIMUM allowable rung spacing for the cable tray shall be _____.
9 inches
Apply the general method of calculations for dwellings and determine the demand load, in kW, on the service and feeder conductors for one (1) 16 kW, 240-volt, single-phase, household electric range.
9.6 kW
Determine the initial standard size nontime delay fuses permitted for branch-circuit, short-circuit and ground-fault protection for a 5 hp, 240-volt, single-phase, ac continuous-duty motor with no code letter indicated on the nameplate.
90 amperes
A conductor with THHN marked on the insulation has a temperature rating of ______.
90 degrees C
When branch circuit conductors are installed inside a ballast compartment of a luminaire and they are within 3 inches of the ballast, the conductors shall have a temperature rating NOT lower than _____.
90°C
Receptacle outlets installed at a height of 16 inches above the floor in an unvented boat repair shop containing flammable liquids, are considered to be installed in a _____ hazardous location.
Class I, Division 2
Under which, if any, of the following conditions is the neutral NOT to be counted as a current carrying conductor? I - When it is only carrying the unbalanced current. II - When it is the neutral of a 3-phase wye-connected system where the major portion of the load consists of nonlinear loads.
I only
Unless exceptions are a consideration, all services supplying dwelling units must be provided with _____. I - a surge-protective device (SPD) II - ground-fault circuit interrupter (GFCI) protection
I only
The ampacity of a conductor is defined by the NEC to be the maximum current, in amperes, a conductor can carry continuously under the conditions of use without exceeding ______.
It's temperature rating
When sizing the overcurrent protection for a single non-motor operated appliance, which of the following need NOT to be taken into consideration?
The length of time the appliance operates.
At buildings where communications systems are likely to be used, an intersystem bonding termination shall be provided for the communications systems at an accessible location at the service equipment. It shall be an aluminum or copper busbar not less than ¼ in. thick x 2 in. wide and be of sufficient length to accommodate at LEAST _____ terminations for communications systems in addition to other connections.
Three
Which of the following wiring methods is/are approved for use for fixed wiring in an area above Class I locations in a commercial garage?
Type MI cable. Type TC cable. Type MC cabled. (All of the above)
For solar photovoltaic systems, single conductor cable Type ___ and single conductor cable listed and identified as photovoltaic (PV) wire is permitted in exposed outdoor locations in PV source circuits within the PV array.
USE-2
The interior of enclosures or raceways installed underground shall be considered as a _____ location.
Wet
According to the NEC, recessed lay-in type luminaires installed in suspended ceilings shall:
be attached to the ceiling framing members by bolts, screws rivets or clips.
All exposed non-current-carrying metal parts of an information technology system shall _____ or shall be double insulated
be bonded to the equipment grounding conductor
Thermostatically controlled switching devices serving as both controllers and disconnecting means for fixed electric space heating equipment shall _____.
be designed so that the circuit cannot be energized automatically after the device has been manually placed in the OFF position
Where rigid metal conduit (RMC) is used to protect a grounding electrode conductor, the conduit MUST _____.
be electrically continuous from cabinet to ground clamps
Which of the following statements, if any, are true regarding a built-in dishwasher located in a dwelling? I - The maximum permitted length of the cord supplying the dishwasher is 6½ feet. II - The receptacle provided for the dishwasher shall be located in the space adjacent to the space occupied by the dishwasher.
both I and II
In general, a motor disconnecting means must disconnect:
both the motor and controller.
A concrete-encased grounding electrode shall consist of at LEAST _____ in one continuous 20-foot length. I - size 4 AWG bare copper conductor II - ½ in. diameter steel reinforcing rod
either I or II
All 125-volt, single-phase receptacles supplied from the emergency system shall have a distinctive color or marking on _____.
either the receptacle or the receptacle cover plate
Direct-buried raceways which are subject to movement by settlement or frost, shall be arranged to prevent damage to the _____ or the equipment connected to the raceways.
enclosed conductors
Determine the MINIMUM number of 15-ampere, 120-volt, general lighting branch-circuits required for a dwelling with 2,600 square feet of habitable floor area.
five
Plug fuses of the Edison base type are prohibited _____.
for new work in all buildings
The NEC mandates specific branch circuits, receptacle outlets and utilization equipment to be provided with a ground-fault circuit interrupter (GFCI); this device is intended ______.
for the protection of personnel.
What is the MINIMUM number of 120-volt, 20-ampere, general lighting branch circuits required for a dwelling unit having a calculated lighting load of 9,600 VA?
four
Compliance with the provisions of the NEC will result in an electrical installation that is essentially _____.
free from hazard
In health care facilities, Type 1 essential electrical systems shall have a MINIMUM _____ .
of two (2) independent sources of power
On a 4-wire, delta-connected electrical system, the conductor having the higher voltage to ground, (high-leg), shall be identified as _____ in color, if the grounded conductor is also present to supply lighting or similar loads.
orange
Receptacles incorporating an isolated equipment grounding conductor connection intended for the reduction of electrical noise, shall be identified by a/an _____ located on the face of the receptacle.
orange triangle
Under which of the following conditions would a run of electrical metallic tubing (EMT) with compression fittings require a wire-type equipment grounding conductor to be installed in the EMT with the circuit conductors? EMT installed ______
outdoors on a roof supplying a rooftop HVAC unit
For a motor used in a continuous-duty application, the motor nameplate current rating is used to determine the size of the _____ required for the motor.
overload protection
Electrical equipment, that is in other than dwelling units, and are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field or factory marked to warn qualified persons of _____ .
potential arc flash hazards
Where ungrounded (phase) conductors are run in parallel (electrically joined at both ends) in multiple raceways, the wire-type equipment grounding conductor, where used, shall be _____.
run in parallel in each raceway.
Given: The total demand load for the show window lighting of a retail clothing store is calculated to be 16,000 VA. Your task is to determine the MINIMUM number of 120-volt, 20-ampere branch circuits required to supply the show window lighting.
seven
Type MI cable shall be supported and secured at intervals NOT exceeding _____.
six feet
The connection between the grounded circuit conductor and the supply-side bonding jumper, or the equipment grounding conductor, or both, at a separately derived system is defined as the _____ in the NEC.
system bonding jumper
All nonlocking-type, 125-volt, 15- and 20-ampere receptacles located in guest rooms of hotels and motels and their common areas shall be listed _____ receptacles.
tamper-resistant
The lightning protection system ground terminals shall be bonded to _____.
the building or structure grounding electrode system.
Where fuses are used for motor overload protection, if the supply system is a 3-wire, 3-phase, ac with one conductor grounded, the NEC requires a MINIMUM of _____fuses.
three
For the purpose of determining conductor fill in a device box, a single-pole switch and/or a three-way switch is counted as equal to _____ conductor(s), based on the largest conductor connected to the switch.
two
In guest rooms of hotels, motels, and sleeping rooms of dorms a MINIMUM of _____ general-purpose receptacles installed in the room is/are required to be readily accessible.
two
Induction motor during no load condition will have a power factor in the range:
0.2
In indoor areas where walls are frequently washed, such as laundries or car washes, metallic conduit and metallic panelboards shall be mounted with a MINIMUM _____ space between the wall and conduit or panelboard when the equipment is installed exposed.
1/4 in
Isolating devices or equipment disconnecting means of solar photovoltaic systems shall be installed in circuits connected to equipment at a location within the equipment, or within sight and within at LEAST ______ of the equipment
10 feet
Grounding electrodes made of pipe or conduit shall NOT be smaller than _____ electrical trade size.
3/4 in.
Determine the MAXIMUM number of size 14 AWG THHN conductors permitted to be installed in a trade size 3/8 in. flexible metal conduit (FMC) that contains a bare size 14 AWG grounding conductor, when the FMC has external fittings.
four
Given: A metal junction box has a volume of 27 cubic inches and contains a total of six (6) size 12 AWG conductors, no grounding conductors, devices or fittings are contained in the box. Additional wires of size 10 AWG need to be added in the box. What is the MAXIMUM number of size 10 AWG conductors may be added to this box?
five
Where a motor of more than 1 horsepower has a temperature rise of 50 deg. C indicated on the nameplate, for the purposes of selecting the overload device, this device shall be selected to trip at NO more than _____ of the motor's full-load ampere rating. (Assume modification of this value is not necessary.)
115 percent
Determine the conductor ampacity given the following related information: -conductors are size 500 kcmil copper -conductor insulation is THWN -eight (8) current-carrying conductors are in the raceway -ambient temperature is 125 deg. F -conduit length is 50 feet -installation is a wet location
178.2 amperes
For enclosing a mobile home supply cord, what is the MAXIMUM trade size conduit permitted between the branch circuit panelboard of a mobile home and the underside of a mobile home floor?
1¼ in.
Given: You are to install the following conductors in a 50 foot run of Schedule 40 PVC conduit: -three (3) size 2 AWG THWN circuit conductors -one (1) size 8 AWG THWN equipment grounding conductor What trade size Schedule 40 PVC conduit is required to contain the conductors?
1¼ in.
The NEC considers the area around the motor fuel dispensing pumps of an automotive service station to be a hazardous location. This area extends a height of 18 inches above grade, and up to a distance from the enclosure of the outdoor motor fuel dispensing pumps of ____.
20 feet
Given: A commercial building provided with a 208Y/120-volt, 3-phase electrical system has a calculated demand load of 72,000 VA; the ungrounded (phase) service-entrance conductors must have an ampacity of at LEAST _____.
200 amperes
Determine the MAXIMUM number of size 1 AWG XHHW compact conductors permitted in a trade size 3 in., rigid Schedule 40 PVC conduit more than 24 inches long.
21
A general-use snap switch with an ampere rating of NOT less than _____ shall be permitted as the motor controller for a single-phase 2 hp, 240-volt motor.
24 amperes
Outside open conductors of not over 1000 volts shall have a clearance of NOT less than _____ from signs, chimneys, and television antennas.
3 feet
What is the MAXIMUM length of a flexible cord that may be used for a recirculating water pump motor on a swimming pool at a dwelling?
3 feet
Where exceptions are not to be considered, service conductors installed as open conductors shall have a clearance of NOT less than _____ from windows that are designed to be opened, porches, doors or balconies.
3 feet
Infrared commercial and industrial heating appliances shall have overcurrent protection NOT exceeding _____.
50 amperes
Where the NEC specifies that one equipment shall be within sight of another equipment, the specified equipment is to be visible and NOT more than _____distant from the other.
50 feet
When conductors of different systems are installed in the same raceway, one system grounded conductor shall be white or gray. The other system grounded conductor shall be ____.
white or gray with an identifying colored stripe that is not green
