Master Electrician Exam Review
1200 Amperes
19. When an equipment room houses electrical equipment rated at LEAST _____or more, the personnel doors intended for entrance to and egress from the working space, shall open in the direction of egress.
25'
A 125-volt, single-phase, 15- or 20- ampere-rated receptacle outlet shall be installed at an accessible location for the servicing of heating, air conditioning, and refrigeration equipment The receptacle shall be located on the same level and within ______of the heating, air-conditioning, and refrigeration equipment The receptacle outlet shall not be connected to the load side of the equipment disconnecting means
four times as great
A copper wire with twice the diameter of another wire has a current carrying capacity:
115%
A disconnecting means that serves a hermetic refrigerant motor compressor shall have an ampere rating of at least percent of the nameplate rated load current or branch circuit selection current, whichever is greater.
6 feet
A separation of at least ______shall be maintained between communications wires and cables on buildings and lightning conductors, where practicable
700
A service switchboard sized over 5000 amps with a 100% rating shall have copper bus bars sized on an ampacity of _____per square inch
Energy
A watt-hour meter is used to measure
1
At least_____ 125 V, single phase, 15 A or 20 A, duplex with ground-fault circuit interrupter receptacle shall be provided in each elevator machine room and elevator machinery space.
5 times
Bending radius in type AC cable should be at least _____ the diameter of the AC Cable
12 AWG
Communications circuits shall have a minimum grounding conductor of _____AWG
1 1/2"
Flat:top underfloor raceways over 4 inches, but less 8 inches wide, with a minimum 1 inch spacing between raceways, shall be covered with concrete to a depth of not iess than 1 inch. Raceways spaced less that 1 inch apart shall be covered with a concrete to a depth of
36"
For switchboards that are not totally enclosed, a space of ____ or more shall be provided between toe top of the switchboard and any combustible ceiling
locking
GFCI protection at a carnival is not required for equipment at circuit if the receptacle is of the ____________type
1000A
Ground-fault protection of equipment shall be provided fro solidly grounded wye electrical services of more than 150 volts-to-ground, but not exceeding 600V phase-to..phase for each service disconnecting means rated
12
How many # 10 conductors can be legally installed in a 4 inch square box, 2 1/8 deep?
One
How many receptacles are required within the perimeter of a balcony, deck or porch with a useable area of less than 20 SQ. feet
Combination Range hood/ Microwave oven
In a Dwelling Unit which appliance is allowed to have a 24" cord with attachment ground plug?
shall not be opened under load can be used only as isolating switch
Knife switches rated for more 1200 amps at 250v or Less ______
25A
Lighting systems covered by Article 411 shall have a power supply rated not more than______and not more than 30V
10'
Lighting systems operating at 30V or less shall not be·installed within_______of pools, spas, fountains, or similar locatipns
Cable Tray
MV cable rated 35 KV cannot be installed in
10 feet
Nonmetallic cables can enter the top of surface-mounted cabinets, cutout boxes, and meter socket enclosures through nonflexible raceways not less than 18 in. or more than ______ft in length if all of the required conditions are met.
0.001 inch
One circular mil is the area of a circle whose diameter is:
4"
Open conductors installed outside shall be separated from open conductors of other circuits or systems by not less than
18"
Receptacle outlets in floors shall not be counted as part of the required number of receptacle outlets unless located within ______ of the wall
10 AWG Copper
Service Lateral conductors that supply power to limited loads of a single branch circuit-such as a small polyphase power, controlled water heaters, and similar loads-shall not be smaller than
in a straight line
The grounding of communications wires should be run to the grounding electrode:
two
The number of receptacle outlets for guest rooms in hotels and motels shall not be less than that required for a dwelling unit These receptacles can be located to be convenient for permanent furniture layout but at least _____receptacle outlets shall be readily accessible
USE
Type______ is a multi conductor cable identified for use as underground service-entrance cable
not less than 1 1/4 in. from
Where cables or nonmetallic raceways are installed through bored.holes in joists, rafters, or wood members;holes shall be bored so that the edge of the hole is the nearest edge -of the wood member.
12 /40
Where communications wires and cables and electric light or power conductors are supported by the same pole and are run paralled to each other in span , the·supply service drops of 0-750 volts running above and parallel to communications service drops shall have a minimum separation of _______inches at any point in the span, including the point of and at their attachment to the building, provided the nongrounded conductors are insulated and that a clearance of not less than_______ inches is maintained between the two services at the pole
5/7
Where service equipment totaling 1000 KVA, or larger is installed separately, or as part of a switchboard, the room in which such switchboard is located shall be constructed of noncombustible materials having a two hour fire rating and shall be of dimensions adequate to house the switchboard and to provide the following minimum clearances: At least _____Feet in front of the switchboard if if is in one line, and at least_______ Feet in front of the board if boards are installed facing each other
50'
Where this code specifies that one equipment shall be "in sight from", "within sight from" or ''within sight of', and so forth, another equipment, the specified equipment is to be visible and not more than ______ distant from the other
Accessible non current-cariying metal parts are required to be connected to an equipment grounding·conductor.
Which of the following statements best describes the grounding requirements for central vacuum outlet assemblies?
Inverse time
_______ is a term indicating that there is an intentional delay in the tripping action of the circuit breaker, which decreases as the magnitude of the current increases
6'
outlets may be installed in a dwelling unit for specific appliance such as laundry equipment What is the maximum distance allowed between this outlet and the appliance?
Refrigerator or Electric Clock
A receptacle connected to one of the dwelling unit small applicance branch circuits can be used to supply an _______ in any of the rooms specified in 210.52(B)(l)
1,000,000 cm
A round bus-bar one inch in diameter, has a circular mil area of:
26"
Access openings in a manholes shall be not less than:
Resistance
As compared to #10, a #8 wire of the same Iength has less:
8
Communications Wires and cables shall have a vertical clearance of not less the ______feet from all points of roofs above which they pass.
35KV
Dry type transformers installed indoors rated over._______ shall be installed in a vault.
50%
Dwelling units circuits running through another dwelling unit in common areas. What percentage of change, will require it to be brought up to current code
50V
Exposed live parts of motors and controllers operating at or more between terminals shall be guarded against accidental contact by enclosure or by location
12"
For cord and plug connected electric vehicle supply equipment is used, the interrupting device of a listed personnel protection system shall be provided and shall be located in the power supply cable not more than ______from the attachment plug.
180 VA
For other than dwelling occupancies, banks, or office buildings, each receptacle outlet shall be calculated at not less than _____ VA.
protective barrier or a fixed ladder shall be provided
Manhole openings for personnel shall be located where they are not directly above electrical equipment or conductors inthe enclosure. Where this is not practicable
24"
Outdoor electrical vehicle charging sites, unless specifically listed for the purpose and location, the coupling means of the electric vehicle supply equipment shall be stored or located at a height of not less than ______ and not more than 4ft.
12Ft
Overhead feeder conductors shall have a minimum __________ vertical clearance over residential property and driveways, as well as those commercial areas not subject to truck traffic, where the voltage is limited to 300 volts-to-ground.
B
Panel boards 'supplied by a three-phase; 4-wire, delta-connected system shall have the phase with higher voltage to ground (high-leg) connected to the phase
36 inches
Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of horizontally shall be provided.
6 AWG
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
1O ohms
The equivalent value of 0.1 mho is
50'
What is the maximum run length of a 18AWG fixture wire that is tapped on to a 20 amp branch circuit?
Four
A hospital is a building or portion there of used for the medical, psychiatric, obstetrical, or surgical care, on a 24-hour basis, of _____ or more patients
Earth does not Carry significant current to open over current device
A light post with no equipment ground. But there are two separate ground rods with 25 ohms to ground. What will happen if there is a ground fault?
four
A load demand factor of 75 percent is permitted for _____or more appliances fastened in place such as waste disposals, dishwashers, trash compactors, water heaters, etc,
18"
At least one receptacle outlet shall be installed within of the top of a show window for each 12 linear feet measured horizontally across its length
125%
Branch circuit conductor that supply a single motor used in a continuous duty application shall have an ampacity of not less than Percent of the motors full-load current
3 inches
Branch circuit conductors within _____of a ballast shall have an insulation temperature rating not lower than 90 degree Cor 194 degree F
CL2 and CL3
Class 2 and class 3 cables listed as suitable for general purpose use with the exception of risers, ducts, plenums, and other spaces used for environmental air, shall be Type ______
permit current to flow
Conductance of an electric circuit is that property that will:
2 in of concrete
Conductors are considered outside a buildings when they are buried under not less than
4
Each general care area patient bed location shall be provided with a minimum of_______receptacles, which can be single, duplex, or a combination with each duplex counting as two receptacles
48 times
For straight pulls, the length of a pull box shall not be less than _____ time the outside diameter, over the sheath, of the largest shielded ·or lead covered conductor or cable entering the box on systems over 600 volts
physical damage
In locations where electrical equipment is likely to be exposed to ________ enclosures or guards shall be so arranged and of such strength as to prevent such damage.
8
In straight pull, the length of the box shall not be less than. ____times the trade size of the largest raceway.
Shall or Shall Not
In the NEC, the words "_______ " indicate a mandatory requirement
5'
Lighting track shall not be installed less than______ above the finished floor except' where protected from physical damage or where the track operates at less than 30 V rms, open-circuit voltage
Orange
On a 4-Wire, delta-connected system where the midpoint of one phase winding is grounded, only the conductor or bus bar having the higher phase voltage to ground shall be durably and permanently marked by an outer finish that is in ______ color or by other effective means. Such identification shall be placed at each point on the system where ·a connection is made if the grounded conductor is also present.
90
Temporary electrical power and lighting installations shall be permitted for a period not exceeding ____days for Christmas decorative lighting and similar purposes
branch circuit
That portion of a wiring system extending beyond the final overcurrent device is called the:
4 Feet
The dimensions of working space for access to live parts operating at 3OOV, nominal to ground, where there are exposed live parts on both sides of the work space is
Calculated load
The final sum of the computed loads, based on the minimum code requirements, is the
6 inch
The floors of vaults in contact with the earth shall be of concrete that is not less than ____ Thick, but where the vault is constructed with a vacant space or other stories below it, the floor shall have adequate structural strength for the load imposed on it and a minimum fire resistance of 3 hours.
3
The maximum total voltage drop on branch-circuit conductors is _______Percent
18 feet
The minimum clearance for overhead feeder conductors not exceeding 600V that pass over commercial areas Subject to truck traffic is.
Feeder
The portion of a wiring system between a point of distribution and the branch circuit overcurrent device is
Conductance
The reciprocal of resistance
3.5 Feet
The required working space for access to live parts operating at 300 volts to ground, where there are exposed live parts on one side and grounded parts on the other side is.
directly proportional to its length
The resistance of copper wire is:
10.4
The specific resistance of copper wire @ 20° C in ohms per circular mil ft. is
12 feet
The verticaI clearance from ground level over a residential driveway for overhead service conductors not subject to truck traffic and are less than 300 volts to ground shall be _____ ft:
30"
The working space in front of the electric equipment shall not be less than wide, or the width of the equipment, whichever is greater.
20 amp
There shall be a minimum of one branch circuit for laundry outlets required by 210.52
located on a balcony accessible only to qualified persons located in a room only accessible to qualified persons elevated 8 ft or more above floor or other working surface
To guard live parts over 50V but less than 600V, equipment is permitted to be
20A
Two or more ______small-appliance branch circuits shall be provided to supply power for receptacle outlets in the dwelling unit kitchen, dining_ room, breakfast room, pantry, or similar dining areas
12"
Underground service conductors that are not encased in concrete and that are buried 30 inches or more below grade, shall have their location identified by a warning ribbon that is placed in the trench at least_______inches above the underground installation for 40KV
30"
What is the min Horizontal Climbing Space on a power conductors below communication conductors
8 AWG
What is the minimum size of an overhead service drop
8"
What is the minimum thickness of a transformer vault floor made up with bricks or cement filled blocks
Over 100 Lbs
What is the weight in lbs, of a manhole cover that is use to keep out unqualified persons from accessible to opening the manhole?
6
When installing receptacle around the pool they should be set back from the inside walls of not less than ______feet
white or gray
When leads are supplied with lamp holders the conductor attached to the screw shell shall have a _______finish.
Not Allowed in NYC
When mounting a light fixture supported be EMT over a hot tub protected by GFCI must have a height of
Shall be Permitted
When the Code uses the words " " it means the identified actions are allowed but not required, and they may be options or alternative methods.
power supply failure
When the service disconnecting means is a power-operated switch or circuit breaker, it shall be able to be opened by hand in the event of a
white with colored stripe other than green or distinguished by other suitable approved means
Where conductors of different systems are installed in the same raceway, one system shall have a neutral having an outer covering of white or natural gray and each other system having a neutral shall have another covering of
24"
Where it is impracticable to locate the service head above the point of attachment, the service head location shall be permitted not farther than from the point of attachment
36"
Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working Space of _______horizontally shall be provided
