Electrical code
Given: a dispensing station gasoline pump is located outdoors. Electrical equipment is installed 12 inches above grade and 9 feet horizontally from the edge of the pump. This electrical installation sis classified as?
class 1 group d division 2
The ability of a material to PERMIT the flow of electrons through it is called?
conductance
Given : a building has a 120/208 volt, 3 phase service. A low voltage system that requires a separate grounding electrode is installed. Which of the following statements regarding the low voltage system grounding electrode conductor is true?
it must be connected to the power grounding electrode system
The purpose of the National Electrical Code is to proved:
safe electrical installations
Electrical space heating cable installed in a ceiling must be marked with which of the following information?
volts and amps
a 4 unit apartment building with each apartment having a 120/240 single phase service. Equipment is electric heating and cooking, and the net computed load is 40 KVA for each apartment. Using the Optional Method of calculation, the service for the complete building would have a total net computed load of? _______ KVA
72 KVA
a 120/240 volt single phase panel has a 92 KVA balanced incandescent lighting load. The load is in a stock room which comes on only 2 hours at a time. What is the minimum size required of each ungrounded aluminum THW conductor in the feeder circuit to supply this panel
750 kcmil
Given: An AC transformer arc welder has a nameplate primary current of 40 amps and a duty cycle of 90%. Overcurrent ( circuit breaker) protection for the conductors in the circuit that supplies this welder needs to have an ampacity of how many amperes?
76 amps
What low voltage classification is assigned to a remote controlled safety control equipment circuit if failure of the the equipment to operate induces a direct fire or life hazard?
class 1
A grounding electrode system consisting of a ground ring shall encircle a building and consist of at least 20 feet of bare copper conducter an be not smaller than?
#2
You are supported at 12 inches from the weatherhead, what is the minimum size copper wire that can span 60 feet?
#8
An office building has an elevator system with a 5 car(multi-car system). How many elevator car lights are allowed to be connected to a single branch circuit?
1
unprotected cable is to be installed in holes bored in wood studs. Each hole shall be bored so that the edge of the hole is what minimum distance from the edge of the stud?
1 1/4
What is the minimum separation distance from combustible material for a 122 1/2 kva dry type transformer installed indoors unless separated from the combustible material by a fire resistant, heat resistant barrier?
1 foot
What is the fire rating of a transformer vault protected by automatic sprinklers?
1 hour
What is the minimum fire resistant construction rating of the room housing a 300 kVA transformer dry type transformer install indoors?
1 hour
if a transformer is installed in a vault with automatic fire sprinklers, what is the minimum fire rating for the vault door?
1 hour
The time of discharge of residual voltage of a capacitor shall be reduced to 50 volts, nominal, or less within _____ after the capacitor is disconnected from the source of supply
1 minute
What is the MAXIMUM allowable voltage that conductors within electrical flexible metallic tubing (FMT) may carry?
1,000 volts
An Ungrounded copper service entrance conductor of 350 kcmil shall have what size of grounded electrode conductor of copper clad aluminum?
1/0
what is the minimum size service entrance grounding conductor needed for (5) five 600 kcmil conductors?
1/0
What is the minimum required size grounded conductor for 6, 500KCMIL wires in parallel
1/0 awg
When 500 kcmil copper conductor feeds a building, what size of grounding conductor is required to be attached to the buildings structural steel frame?
1/0 awg
Where installe din two or more raceways, the size of the grounded conductor in each raceway shall be based on the size of the ungrounded conductors in the raceway but not smaller than_____.
1/0 awg
single-conductor cables installed in an industrial cable tray shall be a minimum of _____
1/0 awg
What is the minimum emt conduit size for 2-#10 and 2-#8 THWN conductors?
1/2 inch
in a cord and plug connected motor, what is the maximum horsepower for the attachment plug and receptacle?
1/3
What is the maximum horsepower for a cord and plug connected load in a dwelling unit?
1/4 ( less than)
Surface type cabinets or electrical equipment in damp or wet locations shall be mounted so there is at least how much air space between the cabinet and the wall or other supporting surface.
1/4 inch
Where type UF cable is terminated in a plastic single gang box, the cable sheath must not extend less than _____ inside the box and beyond the cable clamp.
1/4 inch
in FACP what is the minimum clearance between low voltage fire alarm cable and linevoltage supply conductors?
1/4 inch
on 120 volt lines, what is the separation in fire alarm panels?
1/4 inch
You must repair the drywall or plaster if there is a space greater than _____ at the edge of the box.
1/8 inch
Refer to the diagram illustrating four gasoline dispenser pumps and canopy lights, how many conduit seals are required?
10
What is the maximum size overcurrent device allowable on a non power limited fire alarm (NPLFA) system using 16 awg conductors?
10 amp
Non-metallic sheathed cable is used to wire an electric range connected to a 50 ampere circuit breaker. What is the minimum size equipment grounding conductor required to be brought with the ungrounded conductors and grounded conductor inside the cable?
10 awg
A company has an electrical contractors license. The Master Electrician decides to leave the company. How many days does the company(Licensee) have to notify the division?
10 days
What length must a hallway be before an outlet is required?
10 feet
Where practical, vaults containing more than _____ KVA transformer capacity shall be provided with a drain.
100
in a gas station, an emergency shutoff must be located within ______ of the pumps.
100 feet
How heavy must a manhole cover be for an enclosure housing conductors over 600 volts?
100 lbs
How much should an underground box cover weigh for 1000 volts?
100 lbs
where the voltage exceeds _____ volts, nominal, permanent and conspicuous warning signs shall be provided.
1000
The primary side of a transformer is 240 volts and the secondary side is 24 volts. what is the ratio of the transformer?
10:1
A 20 unit apartment complex with no laundry facilities, each apartment is 950 square feet with a 6 KW range. What is the calculated load for each individual apartment?
11,998 watts
What is the demand factor for a single 20.8kW range?
11.6 kw
a 2 hp continuous duty motor with a marked temperature rise of 55 degrees C must have a separate overload device at what percent of the full load current rating of the motor?
115
in a hermetic refrigerant motor compressor, the ampere rating shall be _____ percent of the nameplate rated load current.
115
Which of the following is not considered a standard fuse rating?
115 amps
Disregarding all exceptions. the ampacity of the conductors from the generator terminals to the first over current device shall be a minimum of _____ of a nameplate current rating of & the generator.
115%
If a evidentially licensed journeyman and master electrician, and a commercially licensed journeyman and master electrician are all on a jobsite, how many apprentices are permitted
12
In kitchen and dining areas of dwelling units, a receptacle outlet shall be installed at each counter space ________ inches or wider.
12
What is the maximum amperage for a cord and plug connected load toa receptacle of a 15 amp circuit?
12
a 20 ampere branch circuit has three 15 ampere receptacles. Each receptacle may supply a maximum cord and plug connection load of _________ amperes.
12
Overhead conductors 300 volts or less to ground shall have a minimum clearance of ____ over a residential driveway.
12 feet
A substation of 600 volts or more has a six foot fence with three strands of barbed wire along the top, how high above the fence must the top strand of barbed wire be?
12 inches
Cables buried directly in earth for residential branch circuits rated 120 volts or less with GFCI protection and maximum overcurrent protection of 20 amps shall be permitted with a minimum cover of at least how many inches.
12 inches
How many inches from a service head shall service cables be supported?
12 inches
What is the minimum separation beween coaxial cable and 120/240 volt power underground
12 inches
a 112 1/2 kVA transformer is installed indoors. What is the minimum clearance from combustible material?
12 inches
The radius any bent in Type MC cable shall be so made that the cable will not be damaged. The radius of the curve of the inner edge of any bend shall not be less than _____ the outside diameter (OD) of a single shielded conductor more than 3/4 inch but less than 1 1/2 inches.
12 times
The minimum bending radius of the diameter of shielded conductors is
12 times the overall diameter
Whyat is the maximum bending radius for lead covered cable over a thousand volts?
12 times the overall diameter
Given: (2) 12-2 NM cables and (2) 14-2 NM cables are run through a wood joist that must be sealed with fire resistant caulk. What are the ampacities of the cables after adjustments?
12-2 20 amps, 14-2 15 amps
if 1100 amps does not fit an overcurrent device, then you must increase the protection to how much?
1200 amps
in a photovaltaic source circuit currents, the maximum current shall be the sum of parallel module rated short circuit currents multiplied by:
125 percent
An overcurrent sensing device shall cause the main switch to open the load on an autotransformer if the continuous current per phase or neutral rating exceeds ______.
125%
What is the maximum over current primary only protection of transformers with a current of 10 amps?
125%
Where phase converter loads to be supplied are variable, they shall be protected from over current at no more than what percent of the phase converter nameplate single phase input full-load amperes
125%
Communication cables entering a building shall be grounded to the ground electrode by what minimum size conductor?
14 awg
An electic sign subject to vehicle traffic should be how high above the ground?
14 feet
What is the maximum distance between horizontal supports for 1 1/2" inch rigid metallic conduit?
14 feet
What is the Nema configuration on the receptacle shown in the NEC figure 550.10C?
14-50r
What conductor temperature rating is used for #10 awg Type SE cable installed in thermal insulation?
140 degree
Covert 63 degrees Celsius to Fahrenheit.
145 degrees
A transformer with a primary side load of 12 amps shall be supplied by what size breaker?
15 amp
A transformer with a primary side load of 12 amps shall be supplied by what size breaker? there is no secondary protection.
15 amp
A hot tub is to be wired with cord and plug wiring method with GFCI protection. What is the maximum allowable length of the cord?
15 feet
The maximum cord length for an outdoor hot tub is
15 feet
What is the nameplate current rating percentage ona 30 and 60 minute, varying duty motor?
150
Fuses in circuits of any voltage where accessible to other than qualified persons, and all fused in circuits over ____ to ground, shall be provided with a disconnecting means on their supply side.
150 volts
The maximum voltage between the conductors for swimming pool underwater lighting fixtures is?
150 volts
How many hours of continuing education are electricians required to complete every 2 years?
16
17 1/2 inches
17 1/2 inches
Convert 63 degrees Fahrenheit to Celsius
17 degrees
A 120 volt branch circuit has a load of 10 amps. The conductor length is 500 feet, and the wire has a resistance of 1.75 ohms per 1,000 feet. What is the voltage drop?
18
Under water lighting fixtures are in the wall of the permanently installed swimming pool. Disregard NEC exceptions. The top of the fixture lens must be at least ______ inches below the normal water level of the pool.
18
What is the minimum size copper conductor used for NPLFA circuit conductors?
18
What is the minimum multi-conductor non-power limited wire size allowed for a fire alarm?
18 awg
What is the MINIMUM number of feet that open conductors rated at 480 volts shall be above a commercial driveway which is subject to truck traffic?
18 feet (5.5 m)
Class I Division I hazardous locations, conduit seals shall be places a maximum of how many inches from enclosures of arc producing devices.
18 inches
Given: Underwater lighting fixtures are in the walls of a permanently installed pool. Disregarding National Electrical Code exceptions, the top of the fixture lens must be at least _____ inches below the normal water level of the pool .
18 inches
In a Class I, Div I location, a sealoff must be located within _____ of a pressurized enclosure.
18 inches
Underwater luminaries installed in a swimming pool shall not be located less than _____ below normal water level of the pool unless otherwise listed.
18 inches
in a Class 1 Zone 1 location, conduit seals must be installed within what distance of pressurized enclosures?
18 inches
A current of .019 amps equals how many millamps?
19
if you have 135 kilo ohms and 145 micro amps, what is the voltage?
19.575 volts
Plate electrode shall expose not less than ______ square feet of surface to exterior soild
2
a 3/8 inch flexible metal conduit with fittings on the outside of the conduit. What is the maximum number of insulated size 12 awg type TW conductors permitted in this conduit?
2
a ground ring shall be in direct contact with the earth at a depth below the earth surface not less than:
2 1/2 feet
Given the coaxial cable on a cable TV system is inside a building where electrical power conductors are NOT in the same raceways or cable trays. What minimum separation must this coaxial cable have from the electric power lines?
2 inches
What is the minimum clearance required for wiring located above a heated ceiling?
2 inches
What is the minimum required separation when Class 2 and Class 3 circuits are in an enclosure with light and power circuits?
2 inches
According to Utah state law, what is the ratio of apprentices to journeyman or master electricians on a commercial, institutional, or industrial job site?
2 to 1
if you have 32 apartments that are 930 square feet each, what is the lighting load for each unit?
2,790 va
What is the smallest transformer that can be used to run a 3 phase, 240 volt, 1 hp motor on a water pump to drain a basement?
2.18 kva
a size 12 awg conductor requires _____ cubic inches of free space within an aoutlet box.
2.25
a single non motor operated appliances must have over current protection not exceeding how many amps?
20
What is the maximum size circuit breaker that can be used on a class one that supplies a class two transformer?
20 amp
PLFA circuit transformer supplied from power supply conductors shall be protected by an over current device rated not more than?
20 amps
What is the highest branch circuit rating for fire alarms?
20 amps
What is the primary protection of a transformer that is 240 volts, 13 amps?
20 amps
What is the maximum length allowed for a primary grounding protector in on e and two family dwellings?
20 feet
Within how many feet of the inside walls of a swimming pool must an outlet be GFCI protected?
20 feet
A single family dwelling unit has a calculated load of 35,682 watts shall be corrected to ____, using the optional method.
20,273 watts
What is the voltage that medium voltage begins at?
2001
Refer to the illustration: Given: Two feeders are pulled through this box. One feeder has three size 350 kcmil conductors run between the 3 inch conduits, and the other has three size 2 awg conductors run between the i inch conduits. What is the minimum height of this box ( dimension 'C')?
21 inches
Bends of RMC ( rigid metal conduit) shall be made so that the conduit will not be damaged and so that the internal diameter of the conduit will not be effectively reduced. What is the minimum bending radius for a 4 inch conduit?
24 inches
Conductors may be installed in nipples with out derating when the nipples do not exceed a maximum length of:
24 inches
Thermoplasitc insulated fixture wires shall be durably marked on the surface at intervals not exceeding _____ .
24 inches
The total resistance to ground, measured with an ohm meter, of a grounding rod shall not exceed _______ ohms.
25
a four family dwelling unit has a heating and air conditioning unit installed on a roof. For servicing of the unit, a 125 volt receptical is required on the same level at a maximum of _______ feet from the unit.
25
if a grounding rod does not have a resistance of _____ ohms or less, it must be augmented by one additional electrode .
25
A transformer supplying a lighting system operating at 24 volts is limited to a secondary current of _____.
25 amps
What is the primary protection of a transformer that is 600 volts, 20 amps?
25 amps
Service outlets for roof top air conditioning equipment shall be installed withing how many feet of the equipment?
25 feet
At what voltage does RMC require two lock nuts, one inside and outside of boxes and cabinets for other than service equipment bonding, if concentric or eccentric knockouts are not encountered?
250 volts
What is the minimujm size of FPL cable?
26 awg
What is the minimum size multiconductor power-limited wire allowed for a fire alarm system?
26 awg
A continuous load is load where the maximum current is expected to continue for _____ hours or more
3
In a single family dwelling where the general lighting load is 6,000 va, How many 20 amp branch circuit would be required to serve this load?
3
In the state of utah, what is the maximum number of stories a commercial building allowed with a Residential?small Commercial License?
3
The maximum number of power or lighting conductors that can be installed in a raceway before derating factors apply is:
3
The minimum Clearance of service conductors which are installed as opened conductors from windows, doors, porches, fire escapes and similar locations is _____ feet.
3
in Utah, what is considered the smallest multi family dwelling unit?
3
in trades size 3/8 flexible metal conduit with outside fittings, how many 12 awg THHN conductors can fit inside?
3
Which of the following would you consider the smallest multifamily dwelling?
3 Plex
For other than a totally enclosed switchboard, a space not less than ______ shall be provided between the top of the switchboard and any combustible ceiling, unless a noncombustible shield is provided between the switchboard and the ceiling.
3 feet
How many feet from a bathroom should a fire alarm, smoke alarm or fire detector be installed?
3 feet
What is the maximum length of a flexible cord that can be used for stationary equipment for a permanently installed pool?
3 feet
in bathrooms, what is the maximum distance from the outside edge of each basin that an outlet can be installed?
3 feet
Each doorway leading into a transformer vault shall have a minimum of what hour fire rating
3 hour
A Continuous load is considered to be how long?
3 hours
The NEC classifies continuous load as equipment running at a maximum load for a minimum time of?
3 hours
In what case is the neutral not considered a current carrying conductor?
3 wire single phase 120/240v
Branch-circuit conductors within _____ inches of a ballast within the ballast compartment shall have an insulation temperature rating not lower than _________.
3, 90 degrees C
Given: a 120/208v 3 phase service has three parallelized size 500 kcmil copper conductors per phase. the grounding electrode conductor from the main service panel to the cold water pipeline must be at least _____ copper.
3/0 awg
Underfloor raceways that are not over 4 inches in width shall have not less than _____ of concrete or wood above the raceway.
3/4 inch
Given: a hermetic refrigerator mtor compressor has a rated load current of 20 amps branch circuit selection current of 26 amps. A disconnect means must be rated at least _______ amps
30
What is the maximum ampere circuit that can be used on a neon sign?
30 amps
What is the minimum depth you can direct bury a 13,800 volt line?
30 inches
What is the service demand factor load for 14 ranges at 13.4 kW each
30.5 KW
Communication wires and cables shall have a voltage rating of not less than _____ volts.
300
What is the voltage for FPL cable?
300
in a surface nonmetallic raceway, what is the maximum voltage difference allowed between conductors?
300
PLFA cable is rated for _____.
300 volts
What is the maximum length for a kitchen waste disposal cord?
36 inches
The motor overload protection for a 25 hp continuous duty motor with a nameplate rating of 31.6 amps needs to be rated at what amperes
36.34
Using the NEC, how many degrees of bending is allowed between pull points in a metal conduit?
360 degrees
What KV rating does a dielectric liquid filled nonflammable transformer need to be installed in a vault?
36kv
Given: Nine (9) size 6 awg type XHHW conductors are in a conduit 50 feet long in a wet location and operate at 110 degrees F. For calculation purposes consider termination as rated for 75 degrees C. What is the maximum ampacity of each conductor?
37 amps
Given: Nine (9) size 6 awg type XHHW conductors are in a conduit 50 feet long in a wet location and operate at 110 degrees F. for calculation purposes consider termination as rated for 75 degrees C. What is the maximum ampacity of each conductor?
37 amps
Given: An AC transformer arc welder has a nameplate primary current of 40 amps and a duty cycle of 90%. Each ungrounded conductor in the circuit that supplies this welder need a calculated ampacity of at least
38 amps
Given: a metal junction box is a trade size of 4 inches x 1 1/2 inches square. it contains 4 size 12 awg conductors, 2 pairs spliced together, 2 grounding conductors spliced together and a flat cover. There are no devices or clamps mounted in the box. What is the maximum additional size 12 awg conductors that may be added to this box?
4
The floors of transformer vaults in contact with the earth shall be of concrete with a minimum thickness of at least ______ inches.
4
Electrical conduit is available in the following sizes except:
4 1/2 inch
Disregarding exceptions, if the copper ungrounded conductors of a 120/240 volt single phase dwelling service are size 3/0 awg, what is the MINIMUM allowable awg size for the copper grounding electrode conductors?
4 awg
Where raceways containing ungrounded conductors _____ and larger enter a cabinet, the conductor shall be protected by a plastic bushing
4 awg
A door sill or curb of a transformer vault shall be of sufficient height to confine the oil from the largest transformer within the vault, and in no case shall be less than what height
4 inches
What is the height of a sill on a transformer vault?
4 inches
What's the smallest size box that can contain 3 #10 and 3 #6 wires?
4 x2 1/8 square
At what maximum intervals does FMC cable need to be fastened or secured?
4.5 feet
What is the adjustment factor (conductor fill %) for 33 conductors in nonmetallic tubing?
40
What is the maximum fill for 3 conductors in a 1 inch nipple 36 inches long?
40%
A 3 phase squirrel cage motor with full feature reactor starting has no code letter. To calculate the size of fuse to protect the branch circuit of the motor would not be sufficient for the starting current of the motor. The non time delay fuse to protect this motor would be permitted to be increased to a maximum of what perce3nt of the full load current.
400%
A main lug only (MLO) panel is limited to how many overcurrent protection Devices?
42
What is the minimum width of working clearance for a 42 inch wide cabinet?
42 inches
Generator terminal housings shall comply with which of the following?
445.17
a building has 32 apartments. Each apartment has an 8 KW electric range operating at 230/115 volts. What is the minimum service demand for the 32 ranges?
47 KW
The width of the free working space in front of a 480v/120v transformer 48 inches wide must be a minimum of _____.
48 inches
A means shall be provided to reduce the residual voltage of a capacitor to 50 volts in less than ____ minutes after it is disconnected from the source of supply
5
Electrical equipment shall be grounded if within ____ feet of a pool.
5
Given: A run of 3/4 inch rigid metallic conduit crosses ceiling joists that are spaced more than 3 feet apart. the conduit must be securely fastened within what distance of each box, outlet, cabinet or conduit termination
5 ft
What is the recommended maximum total voltage drop on both feeders and branch circuits to the farthest outlet?
5 percent
Grounding electrodes which are not listed and made of steel rods shall have a minimum diameter of at least _____ inch.
5/8
in a completed seal, the minimum thickness of the sealing compound shall not be less than _____ for an installation of 1/2 inch conduit.
5/8 inch
the minimum thickness of the sealing compound in class 1, division 1 and 2 shall not be less than the trade size of the conduit and in no case less than:
5/8 inch
Snap-switches with inductive loads shall not exceed _____ percent of the ampere rating of the switch at the applied voltage.
50
if the NEC requires that the electrical disconnect switch be placed within sight of the electrical equipment and controls, the switch must be within how many feet of the equipment
50
What is the maximum over current protection allowed for commercial infrared lamp heating appliance?
50 amps
a 50 ampere feeder busway tapped from a 200 ampere busway in industrial establishments need not have overcurrent. What is the maximum allowed length of the 50 ampere busway without overcurrent protection?
50 feet
Given: An electrical service consists of six(6) 600 kcmil THHN copper conductors per phase. Calculate the minimum allowable size grounded conductor required.
500
Given the following, what is the calculated demand including outlets? Finished living space at 35 x 26, unfinished basement for future use at 35x26, and upstairs at 35x 15
5000 VA
Which of the following is not considered a standard breaker?
55 amp
A feeder is loaded with a 55 amp non continuous load. There are no motors in this load. What is the minimum ampacity this feeder can be rated for?
55 amps
Where the feeder conductor carries the total load supplied by a service conductor, the feeder conductor shall have an ampacity of:
55 or less
For any building, the service disconnecting means shall consist of not more than how many switches or circuit breakers before a main disconnect is needed?
6
What is the maximum number of service disconnects allowed in a single enclosure?
6
Within how many feet from an outside edge of a basin must an outlet be GFI protected?
6
in a residential stairway with one or more lighting outlets, how many risers before you are required to have a wall switch at each floor level?
6
An insulated grounded conductor of _____ or smaller shall be identified by a continuous white or gray outer finish or by three continuous white stripes on other than green insulation along its entire length.
6 awg
Generally, what is the minimum size aluminum service drop allowed by the NEC?
6 awg
The conductor between the surge arrester and the line and surge arrester and the grounding connection shall be smaller than _____ copper or aluminum. or What size wire should be used between a lighting surge arrester and a grounding electrode?
6 awg
The conductor between the surge arrestor?lighting protection and the line and the surge arrestor and the ground connection shall not be smaller than:
6 awg
CATV cables must maintain _______ distance between lightning conductors.
6 feet
MC cable must be secured within 12 inches of every box or fitting and supported at a minimum of every _____.
6 feet
What is the maximum distance ENT shall be supported from a tap luminaire terminal connection?
6 feet
What is the maximum length allowed for FMT?
6 feet
if an additional electrode is needed for grounding, what is the spacing required?
6 feet
the headroom of working space above a 240 volt motor control center shall be at least ______ feet.
6 feet
Switches and circuit breakers used as switches shall be installed so that the center of the grip or operating handle is not more than _______ feet above the floor.
6 ft 7 inches
How many inches of wire is needed in a box for termination?
6 inches
What is the minimum length of free conductor cable measured from the point in a box where it emerges from its raceway or cable sheath in an outlet box?
6 inches
Where passing through a floor, cables shall be protected from physical damage at what distance above the floor?
6 inches
What is the impedance of a 240 volt circuit that draws 35 amps?
6.86 ohms
every electrical swimming pool water heater shall have its heating elements subdivided in loads not exceeding 48 amps and protected at not more than?
60 amps
A conduit nipple 18 inches long is installed between two boxes. This nipple may be filled to a maximum of ______ without derating conductors. (Note: Up to 24 inches is the same.)
60%
What voltage is a NPLFA type wire rated for?
600 volts
a 32 unit apartment complex has an 18 kw range in each apartment. What is the demand factor for the complex?
61kw
A crane has two motors, one is rated at 30 amps and one is rated at 50 amps. How many amps are in this crane?
65 amps
What is the general lighting and general use receptacle load for a 30,000 sq. ft. bank? (updated method for 2020 NFPA 70)
69 kVA
Overcurrent circuit protection for NPLFA conductors 18 awg shall not exceed:
7 amperes
Transformer and electronic power supplies for electric signs shall have a secondary ground fault protection rating of
7,500 volts or less.
What is the minimum width of the working space in front of an electrical motor control center rated at 480 volts with no live or grounded parts in front of the panel. The panel measures 78 inches wide.
78 inches
CATV cables must maintain a vertical clearance of how many feet above a roof that they pass?
8 feet
Direct buried service conductors emerging from the ground shall be protected from mechanical damage to a height of at least _____ above finished grade.
8 feet
A fourth year apprentice can be left alone on a job for how long?
8 hours in any 24 hour period
How much longer does a box need to be containing #2 straight pull in a 2 inch conduit?
8 times
The demand load rating of one 12 kw range is how many kw?
8.0 kw
Portable appliances are to be used on a 15 or 20 amp branch circuit on which there are two or more outlets. The rating of any cord and plug connected appliance shall not exceed what percent of the branch circuit?
80%
What is the branch circuit rating for portable utilization equipment?
80%
The instantaneous trip breaker of a squirrel cage wound rotor motor shall be what percentage of the full load current?
800
What is the minimum radius of a one shot bend for 2 inch conduit?
9 1/2 inches
What is the minimum ampacity of conductors supplying two 240 volt fixed spaced heaters on a 30 amp branch circuit?
9,000 VA
Branch circuit conductors within three inches of a ballast inside a ballast compartment, shall have an insulation rating not lower than:
90 Degrees C
What is the minimum required headroom of the working space of a switchgear that measures 96 inches high?
96 inches
Refer to the illustration. The switch shown is single pole. the pilot light is a neon lamp rated for 120 volts ac. the grounded connection are made up properly. there are no jumpers between screw terminals except as shown. Which figure shows the connections that will allow the pilot light to be on all the time?
A
a hydromassage tub must have_______.
A GFCI breaker
What is the definition on an intrinsically safe circuit?
A circuit in which any spark or thermal effect is incapable of causing ignition of a mixture of flammable or combustible material in air under prescribed test conditions
Section 430.102(B) requires a disconnecting means located within sight from the motor or driven machinery location. Which of the following is the meaning of the term "within sight from" as used in this section?
A distance visible and not more than 15 meters( 50 feet) from the motor.
Stationary motors of 2 hp or less require what kind of switch?
A general use-switch having an ampere rating not less than twice the full load current rating
For a stationary motor rated at 100 hp, the disconnection means shall be
A general-use switch labeled " do not operate under load"
An insulated grounded conductor larger than 6 awg shall be identified by which of the following means?
All of the above
What is a phase converter?
An electrical device that converts single phase power to 3 phase power
Given : In a normal operation , the load on an overcurrent device located in a panelboard will continue for 4 hours . Disregarding exceptions , the maximum total load allowed for this circuit is what percent of the circuit overcurrent device rating ?
Answer 80 %
All 15,20, and 30 amp, 125 volt, single phase receptacle outlets used by personnel for temporary power shall have ground fault circuit interrupter protection for personnel. GFCI protection can be incorporated into a _____ or other devices incorporating listed GFCI protection for personnel identified for portable use.
Any of These
Which of the following type of protection is required for branch circuits installed in living rooms, dining rooms, bedrooms and parlors?
Arc-fault circuit breaker
Cable splices made and insulated by approved methods shall be permitted to be located within a cable tray, provided they ____.
Are accessible and do not project above the side rails in a manner subjecting them to damage
on a 480 volt, 3 phase, 4 wire, delta connected system, which phase has the higher voltage?
B phase
Instant start fluorescent lamps will not operate without a _____.
Ballast
Where shall overcurrent devices not be located?
Bathrooms
Arc-fault circuit breakers shall be installed on branch circuit conductors and outlets located in dwelling unit ____.
Bedrooms
Arc-fault circuit breakers shall be installed on branch circuit conductors and outlets located in dwelling unit _____.
Bedrooms
The permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed is called?
Bonding (Bonded)
Which of the following shall not be used as a power source for PLFA circuits?
Both GFCI and AFCI circuit breakers
The circuit conductors between the final overcurrent device protecting the circuits and the outlets is called?
Branch circuit conductor
Which of theo following is a permitted use of flat cable?
Branch circuits
if using coaxial cable in an apartment building retrofit, what type of cable can run vertically from floor to floor?
CATVR
Which of the following communication cables is suitable for plenum installation
CMP
Which of the following can be installed in ceilings and plenums used for environmental air space?
CMP in hard pipe
Switches permitted to be used with aluminum conductors shall be marked with which of the following designators?
CO/ALR
An electrical component made up of two conducting materials that are separated by insulation and allows electricity to be stored is called?
Capacitor
When Ci precedes marking on a fire alarm cable, this means?
Circuit integrity
What type of connection device is used to ground to a water main?
Clamp
A low voltage circuit is used in a lower water cutout circuit for a boiler. This circuit must be classified as a ______ circuit if the failure of the equipment to operate introduces a direct fire or life hazard.
Class 1
in which hazardous location are open squirrel cage motors without brushes or centrifugal switches permitted? Disregard all exceptions
Class 1 Division 2
What class and division would a grain elevator be considered?
Class II Division I
What class and division would you be a wood shop with machines and dust particles?
Class III Division I
A load where the maximum current is expected to continue for 3 hours or more is a:
Continuous Load
A motor not marked with a duty cycle rating, shall be considered as:
Continuous duty
Grounded dc photovoltaic arrays located on dwellings shall be provided with ____ to reduce fire hazards.
DC GFCI
What defines electrocution?
Death
Receptacles that proved power for water pump motors shall meet each of the following conditions except?
Duplex receptacle protected in a weather proof enclosure
in a emergency system, automatic transfer switches should be held and operated ______.
Electrically operated and mechanically held
What makes current flow?
Electromotive force
If you have 2 # 12 THWN wires connected to a switch and 2 #14 THHN wires connected to a switch, what size box would be needed?
FD multiple cover/gang 2 3/8"
Which of the following defines 'unprofessional conduct'?
Failing to continuously maintain insurance and registration as required
Which of the following is considered "Unprofessional conduct" by an electrician?
Failure to carry the license at all times
Conductors between the service equipment and the final branch circuit over current device are called:
Feeder conductors
All temporary power receptacles shall be:
GFCI protected
All receptacles used on temporally installed wiring systems shall be what type?
Grounding type
Which of the following does not need to be GFI protected in a dwelling ?
Hallways and Stairways
What are the two principle effects of electrical current in a circuit?
Heating and Magnetic
When metals become hot, the resistance?
Increases
Who is responsible for Electircal work on the job site according to Utah state Law?
Journeyman and master Electricians
The voltage rating of equipment shall not be _____ the nominal voltage of a circuit to which it is connected.
Less than
What is SPD used for?
Limiting transient voltages by diverting surge current
in a Class I location with an explosionproof enclosure with one threaded entry for NPT threaded conduit or fittings, what should be used?
Listed conduit, conduit fittings, or cable fittings shall be used.
What type of cable or cord may be used as concealed wiring in class 1 division 2 and class 2 division 2 locations?
MI
Which of the following can you NOT connect grounding electrodes to?
Metal underground gas pipe
What cables are allowed in any building or structure without a height limit?
NM and NMC
in fire alarms, what type cable is used in ducts and plenums or other spaces for environmental air? -or- A company wants to run fire alarm supply cable through an environmental air duct, what type of cable is required?
NPLFP
Refer to the illustration. Colors marked on the conductors represent circuits wired with non metallic sheathed cable. Assume all grounding conductors are installed correctly. Conductors have not been re identified with colored tape. Which figure is wired correctly according to the NEC?
Neither 1 or 2
When installing conductor on equipment grounding conductor buses, which of the following applies?
No more than one conductor can be installed under one binding screw and terminal unless identified for more than 1
Refer to the illustration, is this circuit acceptable to code?
No, outlets are not rated properly
A circuit that is not capable of igniting flammable gas is called?
Nonincendive
Optical fiber cable in a vertical run, inside a shaft shall be of type?
OFCR or OFNR
Refer to the illustration, what type of circuit is this?
Parallel
When circuit components that are connected across the source they are called?
Parallel
When measuring voltage the meter should be connected in?
Parallel
How often should an emergency system be tested?
Periodically
thermostatically controlled switching devices are allowed to serve as a disconnect, when:
Provided with a marked "off" position
Enclosures secured by lock and key shall be accessible to which of the following?
Qualified persons
Conductors should be _______ to provide ready anbd safe access in subsurface enclosures.
Racked
Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus is known as
Rainproof
What should be done if the motor is running in the wrong direction?
Reverse the field Connection
Which of the following correctly defines alternating current?
Reversed intervals
Of the following cords, What type is approved for a supply conductor cord used for a portable, gas tube sign?
STO
Circuit breakers that are used as switches in 277 volt florescent lighting circuits shall listed be listed for such use and marked?
SWD
in or above a class 1 location, what schedule of pvc can be ran above ground?
Schedule 80
Class 1, Class 2, and Class 3 cables installed above a grid ceiling are allowed to be _____.
Secured to the building structure
IN order to determine amperage in a circuit, the amp meter should be hooked up in _____.
Series
Where an A/C system operating at less than 1000 volts is grounded at any point. This systems grounded conductors shall run to each:
Serviced disconnecting means
Refer to the illustration, What type of chart is this?
Sine Wave
What type of general use switch is used for AC or DC?
Snap Switch
Which of the following is not considered an electrical device?
Speaker
The input to a transformer is 240 volts and the output is 24 volts. This is known as a _____ transformer.
Step down
_______ shall not be used for switching emergency lighting circuits.
Switches connected in series or 3 and 4 way switches
What must be done in order for the electrical service to be hooked up on a manufactured home?
The grounding electrode must be installed and connected.
The purpose of the NEC is to provide _____
The practical safeguarding of persons and property from hazards arising from the use of electricity
an emt raceway runs across an earth quake expansion joint section in a building. the raceway is required to:
The raceway must be made electrically continuous by equipment bonding jumpers
if Class 2 circuits are in a raceway with Class 3 circuits, the insulation must be rated
The same as Class 3 circuits
What shall be done with the gap in raceways or sleeves when portions of them are subject to different temperatures or they pass from the interior to exterior of buildings?
They shall be filled with an approved material to prevent air flow
What is the maximum number of floors electrical non-metallic tubing is allowed to span?
Three
Which of the following is a type of flat cable used under carpet?
Type FCC
What type of cables that are rated over 1000 volts can be installed in the same tray as those rated at 1000 volts or less?
Type MC
Which of the following cables types may be direct buried in earth without protection?
UF
Which of the following is heat and moisture resistant
USE
How do you make a 3/4 inch pipe with NPT threaded fittings connect to a metric explosion proof box?
Use an adapter
Single conductor cable type _____ listed and labeled as photovoltaic wire shall be permitted in exposed outdoor locations in photovoltaic source circuits for photovoltaic module interconnections within the photovoltaic array.
Use-2
Which of the following is used to correctly;y test busways ( bus duct)?
Volt/Ohm meter
Locating the grounding connection point as close as practical to the photovoltaic source better protects the system from ______:
Voltages surges due to Lightning
What type of disconnect shall be used for a 110 hp ac motor?
a general-use or isolating switch marked "Do not operate under load."
Transformers and capacitors filled with flammable liquid installed ina class I Division I area needs to be in _____.
a vault
An insulated grounded conductor 6 awg or smaller shall be identified by which of the following means?
all of the above
High voltage equipment shall be effectively separated from the space occupied by low voltage equipment by a suitable _____.
all of the above
the name plate on an appliance must show?
all of the above
Where shall the circuit DC grounding connection be made on a photovoltaic output circuit?
at any single point
When rigid metallic conduit is installed in a Class 1 Div 1 location, it must be installed with:
at least 5 threads fully engaged
A reliable Conductor to ensure the required electrical conductivity between metal parts required to be electrically connected is called a ______.
bonding conductor or jumper
What class does ignitible fibers fall into?
class III
A mobile home pipe heating receptacle outlet shall be _______.
connected to an interior branch circuit
Thermostatically controlled switching devices are allowed to serve as a disconnect, provided all but one of the following conditions are met:
designed so that the circuit cannot be turned on automatically after the device is placed within sight
according to the NEC, Which of the following statements is true about installing listed or labeled equipment?
equipment must be installed according to the instructions included with the equipment
Which of the following defines 'unprofessional conduct'?
failing to provide proof of insurance coverage within 30 days when requested by the division
What kind of wiring methods cannot be used in ducts for environmental air?
flexible metal conduit exceeding 4 feet
in a raceway with different material being used, you want to avoid which of the following ?
galvanic action
in a class 1 Group A location, what is present?
gas
When is it acceptable to use a general use snap switch on a motor?
if the motor is less than 2 HP
under what condition shall alternating current system of less than 50 volts be grounded?
if the transformer supply system exceeds 150 volts to ground
Refer to the illustration, determine if the installation is NEC compliant or not
in Violation, receptacles should be replaced with 15 amp rated devices
Type MC cable is permitted to be installed in which of the following conditions:
in a metal raceway
modules of photovoltaic systems must be marked with which of the following?
in accordance with their listing
A glass bulb with a filament under vacuum is what type of light?
incandescent
As a conductor size increases, circular millls ______.
increase
A ground resitance reading is taken on the grounding electrode system, it does not read 25 ohms, hwat do you do?
install a second grounding electrode as per NEC 250.52(A).
When a motor control center is used as service equipment, which of the following applies?
it shall be provided with a single main disconnecting means
What may be used to disconnect a 120 hp motor?
knife switch
A circuit connected in parallel will carry ______ amps than one connected in series. ( This question assumes equal voltage and resistance)
more
at what HP should a continuous duty motor be protected against overloads?
more than 1 HP
Given: A ground rod Electrode is driven at least 8 feet in to earth. it's resistance to earth measured at 50 ohms. According to the NEC, this ground rod electrode:
needs to be supplemented by one additional electrode
What is the minimum size equipment bonding condcutor ( copper) required if the rating or setting of the automatic overcurrent device in the circuit is 40 amperes?
no. 10
Electrical apprentices, journeyman, & master must renew their licenses when?
november 30 of even numbered years
in a dwelling unit a multiwire branch circuit that supplies more than one device on the same yoke may be protected by
one double pole circuit breaker
What is the maximum time delay for ground fault protection over 3000 amperes?
one second
A service disconnecting means can be located remotely under what circumstance?
only where used for a water pump intended to provide fire protection
What is the color for the high leg conductor or busbar in a 4 wire delta connected system where the midpoint section of one phase winding is grounded?
orange
A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system is considered a
plenum.
Watt hour is a measurement of the consumption of ?
power
in a class 1 group d location, what kind of gases are present?
propane
all switches or circuit breakers used as switches for oil fired heating units shall be:
readily accessible
the term kilowatt, indicates:
real power
Where subject to physical damage, what schedule of pvc ( non metallic tubing) should be used?
schedule 80
Which of the following is not allowed for connections for grounding and bonding jumpers?
self tapping sheet metal screws and solder connections
When combination surface nonmetallic raceways are used both for signaling and lighting and power cirucits, the different systems shall be run in ______.
separate compartments
The disconnecting means for fixed electric space heating equipment shall
simultaneously disconnect the heater, motor, and supplementary over current protection devices
Given: The ungrounded conductors in a three phase service are size 2,000 kcmil copper. The system bonding jumper shall have an area not less than 12.5% of the area of the largest phase conductor. what is the smallest allowable copper system bonding conductor for this service?
size 250 kcmil
Required grounding contact circuit and bonding jumpers may not be connected solely by what type of connections?
soldered
How should class 2 or class 3 wiring be strapped or fastened in a commercial building?
strapped to the structural beams or supports.
All of the following are true in regards to the uses permitted of nonmetallic rigid conduit except?
subject to physical damage
Which of the following is not permitted to be used when hanging a 75 pound ceiling fan?
supported by an outlet box
Which of the following is true for threaded rigid metal conduit
taper of 1 in 16 (3/4 inch taper per foot)
The ampacity of a conductor is defined as the current in amperes the conductor can carry continuously while in use without exceeding its:
temperature rating
Fire alarm circuits shall be identified at terminal and junction locations that will prevent unintentional interference with the signaling circuit during:
testing and servicing
if a single phase 2 wire inverter output is connected to the neutral and one ungrounded conductor of a 3 phase 4 wire wye connected system, the maximum load connected between the neutral and any one ungrounded conductor plus the inverter rating shall not exceed:
the ampacity of the neutral conductor
The voltage rating of electrical equipment shall not be less than
the nominal voltage of the circuit
Where two (2) separate services supply one (1) building and are required to be connected to a grounding electrode, each service shall be connected to :
the same grounding electrode
Which of the following locations is allowable for bonding the grounding electrode conductor to the grounded service?
the service disconnecting means
Why does a photovoltaic system have a ground-fault interrupter?
to reduce fire hazards
Connections to an enclosure with eccentric knockouts may be made with ______.
two lock nuts, one inside and one outside.
USE cable is used for which of the following?
underground
Whgich of the following is not considered unlawful conduct?
underpaying or failing to pay an employee
A first citation for unlawful conduct may be fined _____.
up to $1000
Electrical equipment may not be mounted on a masonry wall with:
wooden plugs
if a strand on a wire has a cross sectional area of 10,000 circular mils, the diameter of the strand is
0.1 inches
a multi wire branch circuit is hooked for car lights in an elevator. How many elevators can be controlled through one circuit?
1
According to the NEC , electrical junction boxes shall be installed so that the wiring contained in the boxes:
can be rendered accessible
Given: A 15 HP, 208v, 3 phase , wound motor is supplied by top conductors 21 feet in length from a size 500 kcmil copper THW feeder to the fused motor disconnect. The feeder is protected by the maximum fuse size allowed. For calculation purposes consider all termination to be rated for 75 degrees C. What is the minimum size allowable for the copper type THW tap conductor?
1 awg
Given: A 220 volt, 3 phase, induction Continuous duty motor is rated at 40 HP. All termination are rated at 75 degrees C. What is the minimum allowable size for the copper type THW conductors in the branch circuit that supplies this motor?
1 awg
Refer to the illustration, and the conductor colors of Figure 1 and 2, these figures represent circuits wired with nonmetallic sheathed cable. Assume all grounding conductors are installed correctly . which figure is not wired according to the NEC and why
1, because a white wire can never be used as a switch leg return from the switch to the switched outlet
Given: A surface mounted florescent lighting fixture that contains a ballast is to be installed on lay-in ceiling tile that is made of combustible low density cellulose. The fixture is not approved for direct contact with the material. How far must this fixture be spaced from the surface of the fiberboard?
1-1/2 inches
What is the MINIMUM allowable awg size of copper conductor that may be connected in parallel?
1/0
A metal raceway system is installed in the washing area of a car wash. what minimum distance from the surface must the raceway be mounted?
1/4 inch
According to code, in a residential installation, in a nonmetallic box, how far must NMB sheathing penetrate the box?
1/4 inch
Fluorescent lighting fixture each containing 2 ballasts rated 0.8 amps each at 120 volts are to be installed for continuous general lighting in a store. The over current protection devices are not listed for continuous operation at 100 percent of their rating. according the the national electrical code, what is the maximum number of these lighting fixtures that may be permanently wired to a 20 amp 120 volt branch circuit
10
Refer to the illustration. This installation requires at least how many sealing fittings
10
A household clothes dryer has a nameplate rating of 5,000 watts and 240 volts. Based on the minimum load allowed by the National Electrical code, the conductors in this branch circuit must be at least what size copper THHN?
10 awg
an over current protective device for non motorized equipment is rated at 60 amps. What is the minimum allowable size for copper equipment grounding conductors for this circuit?
10 awg
Where only Class 1 circuit conductors are in a raceway, a derating factor shall apply only if such conductors carry a continuous load in excess of what percentage of the ampacity of each conductor?
10 percent
A building has the following facilities: 25,000 square feet of office space, 5,500 square feet for a restaurant; 3,000 square feet for an auditorium. what is the general lighting load feeder demand factor for this building?
100%
What is the MAXIMUM allowable voltage that conductors within electrical nonmetallic tubing (ENT) may carry?
1000
Refer to the illustration. This installation requires at least how many sealing fittings?
12
an open fixture in a commercial garage shall be placed over vehicular lanes at a height of at least
12 feet
Given: the following 3, 3 phase motors are the same except for HP. motor 1, 20 HP; Motor 2, 30 HP; Motor 3, 40 HP; Type;Squirrel cage; Voltage: 440 volts , 3 phase; Current: Nameplate current same as NEC current; Duty: continuous; Start: Autotransformer; Code Letter: A; Each ungrounded conductor in the common feeder circuit supply all three motors needs a calculated ampacity of at least?
132 amps
What is t he maximum number of size 12 awg type THHN Conductors that may be installed in a 20 foot run of 3/4 inch electrical metallic tubing (emt)
16
Given: a 3 phase, squirrel cage motor with full voltage reactor starting has no code letter. disregard all exceptions. the dual element time delay fuse used to proved short circuit protection for this motor branch circuit should be sized at what maximum percentage of the motor full load current?
175%
When an aluminum conductor is used outside for the grounding electrode conductor, what is the minimum number of inches that it must be from the earth?
18
what is the minimum size conductor you can use on electric skeleton tubing?
18 awg
a metal electrical box contains the following; 3 size 12 awg conductors, 3 size 10 awg conductors , 1 flush switch, the switch is connected to two (2) of the size 12 awg conductors. There are no other devices or fittings. The cover plate does not have its capacity marked on it. There are no grounding conductors. All conductors originate outside the box. What minimum capacity is required for the metal electrical box containing these conductors and this switch?
18.75 cubic inches
Refer to the illustration. Given: three size 2 awg conductors feed through this box from the 2 inch conduit on the left side into the 1 1/2 inch conduit on the bottom. What minimum distance is allowed for dimension A?
19 1/2 inches
A switch which controls a lighting transformer is rated at what amperes of the transformer
2
Refer to the illustration, how many receptacles are needed?
2
What is the maximum number of apprentice electricians that a journeyman or master electrician may supervise on a commercial job?
2
Given: a grounding ring consists of 300 feet if bare copper wire encircling a building in direct contact with the earth and buried 3 feet deep. What minimum size copper wire is allowed for this grounding ring
2 awg
Given: A single phase 3 wire, emt feeder has 2 undgrounded conductors that are type THHN size 4/0 awg copper. The neutral conductor is type THHN size 2/0 awg copper. What is the minimum allowable trade size conduit for these feeder conductors?
2 inch
Given: A single phase 3 wire, emt feeder has 2 ungrounded conductors that are type TW size 3/0 awg copper. The neutral conductor is type TW size 1/0 awg copper. What is the minimum allowable trade size conduit for these feeder conductors?
2 inches
What is the MINIMUM number of inches that open conductors for telephone signals inside a building shall be separated from open conductors of light or power?
2 inches
What is the minimum volt amp lighting load required for a show window that measures 14 linear feet?
2,800
When the number of receptacles i s unknown, how many volt amps per square foot are used to calculate the general lighting load for a bank building?
2.3
When the load for show window lighting is being determined, a minimum load of how many volt amps shall be used for each lineal foot?
200 va
Refer to the illustration, what is the minimum dimension of 'C'?
21 inches
Given: A 16 unit apartment building has identical units. Each unit has the following specifications: 735 Square feet of floor space; 120/240 volt single phase service; 1, 1.5 HP, 240 volt AC unit; 2, 6.0 KW 240 volt baseboard heaters; 1, 8.0 KW electric range; 1, 2.5 KW 240 volt water heater. Neither the units or the building have laundry facilities. There are no house loads in the building. Do not use the optional method. What is the total net computed load of the neutral conductor in the service for this 16 unit apartment building?
214 amps
an electrical junction box contains only the following : 3, #12 insulated conductors entering the box spliced to 3, #12 conductor leaving the box. one device on a mounting strap. Two cable clamps. Two bare #12 grounding conductors. What is the minimum cubic inch capacity for this junction box?
22.5 cubic inches
What is the maximum voltage allowed for branch circuits that supply exterior commercial lighting loads?
277 volts to ground
a 120/240 volt 3 phase, 4 wire, power panel which supplies all of the following. 1-15 HP, 240 volt, 3 phase wound rotor motor; 4-5 HP, 240 volt, 3 phase wound rotor motors; 6-5HP, 240 volt, single phase motors; 3-1 KW, 240 volt, single phase base board heaters; Each ungrounded conductor in the subfeeder to this power panel has a total net calculated load of:
296.9 amps
Given: a 3/8 inch flexible metal conduit, with fittings inside the conduit, has a bare grounding conductor. what is the maximum number of type thhn size 14 awg circuit conductors that may be run in this raceway?
3
What is the maximum number of apprentice electricians that a journeyman or master electrician may supervise on a residential job?
3
open overhead service conductors must have horizontal clearance from a porch of at least how many feet?
3 feet
one thirtieth (1/30) of a second is equal to how many hertz
30
Refer to the illustration, disregarding exceptions, what is the minimum width of a clear working space required by the NEC as noted by 'A'? (*note : 600 volts or less)
30 inches
According to the NEC, a class 1 power limited circuit must be supplied from a source having a rated output of NOT more than?
30 volts
Given: A store lighting branch circuit operates under a continuous load. The branch circuit rating is 40 amps. What is the maximum continuous load allowed on this branch circuit?
32 amps
A ceiling fan when supported by a standard outlet box the maximum weight is:
35 pounds
Given: a metal junction box is a trade size of 4 inches x 1 1/2 inches square. it contains 4 size 12 awg conductors, 2 pairs spliced together, 2 grounding conductors spliced together and a flat cover. there are no devices or clamps mounted in the box. what is the maximum additional size 12 awg conductors that may be added to this box?
4
ungrounded conductors entering a raceway in a cabinet shall be protected by an insulated bushing or fitting if the conductors are what minimum size?
4 awg
Refer to the illustration. Each of the supply side emt conduits contain three 500 kmil(mcm) copper TH@ service Conductors. One conductor in each conduit is connected in parallel for each of three phases. AS shown a separate bonding jumper is installed from each conduit to the grounded bus terminal. What is the minimum allowable size for each copper bonding jumper
4/0 awg
What is the maximum number of disconnects ( breakers) that are allowed in a lighting or receptacle panel board, other than the main disconnects?
42
a non locking disconnect for 480 volt motor controller must be visible from the controller and within a maximum of how far from the controller?
50 feet
fourteen (14) current carrying conductors are in an 80 foot conduit run operating at 28 decgrees C or 82 degrees F. Each conductor shall be derated to what percentage of its' original ampacity
50%
A feeder is supplying a continuous load of 240 amps, it is protected by an overcurrent device rated at 300 amps. Consider terminations rated at 75 degrees C. What minimum size type of THW aluminum conductors are allowed as phase conductors for this feeder?
500 kcmil
a park has 35 mobile home sites. the ungrounded wires in the service to supply this park must be calculated size of at least:
560 amps
Given: An explosion proof metal junction box has a capacity of 27 cubic inches and contains a total of 5 size 12 awg wires. Additional conducts of size 10 awg need to be added to the box. no grounding conductors, devices nor fittings are contained in the box. What is the maximum number of additional size 10 awg conductors that may be added to this box
6
Given: the largest service entrance conductor for a commercial building electrical system with a 100 amp main circuit breaker is size 1/0 awg copper. What is the minimum size allowable copper grounding electrode conductor for the system?
6 awg
Given: only the following type THW conductors are installed in an auxiliary gutter. 8,size 1 awg conductors; 7, size 2 awg conductors; 4, size 3 awg conductors; 6, size 6 awg conductors. What minimum size auxiliary gutter is required for these 25 conductors
6 inch x 6 inch
What is the maximum size breaker trip setting?
6 times
Given: A 30 HP wound rotor induction motor with no code letter is to be connected to a 460 volt 3 phase source. Disregarding all exceptions, what is the maximum rating allowed for a non timed delay fuse for short circuit protection of the motor branch circuit?
60 amps
Given: The largest service entrance conductor for a commercial building electrical system with a 100 amp main circuit breaker is size 1/0 awg aluminum. What is the minimum allowable copper grounding electrode conductor for the system?
8 awg
Equipment that is fastened in place has exposed non current carrying metal parts that are likely to become energized. this equipment shall be grounded if it is within what minimum vertical distance from the ground or from grounded metal objects?
8 feet or 96 inches
Given: The lighting load on one circuit in a store will remain on 12 hours a day. Disregard exceptions. What percent of the over current device rating is the maximum total load allowable?
80%
A new 5 unit apartment building has a 120/240 single phase service. Each apartment has a net computed load of 40 KVA. There is no house load in the building. Use the 'OPTIONAL" method. The service of this complete 5 unit apartment building has a total net computed load of?
90 kva
A remote gasoline pump is located outdoors. Electrical equipment is installed 12 inches above grade and 9 feet horizontally from the edge of the pump. This electrical equipment installation is classified as
Class 1 Group D division 2
Where shall outdoor outlets be provided for a single family dwelling:
Grade level front and back
As long as it has continuity top the grounding electrode system, an equipment grounding conductor may be a:
Steel conduit
What type of conductor insulation is required for 13 size 3 awg conductors that are to be installed in a run of 2 inch metallic tubing
THWN
According to the NEC, Electrical junction boxes shall be installed so that the wire contained in the box:
can be made accessible with out removing any parts of the building