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Master Electrician Exam Review
1. branch circuit: That portion of a wiring system extending beyond the final overcurrent device is called the:
2. Calculated load: The final sum of the computed loads, based on the minimum code requirements, is the
3. Resistance: As compared to #10, a #8 wire of the same Length has less:
4. 0.001 inch: One circular mil is the area of a circle whose diameter is:
5. 1,000,000 cm: A round bus-bar one inch in diameter, has a circular mil area of:
6. four times as great: A copper wire with twice the diameter of another wire has a current carrying capacity:
7. 10.4: The specific resistance of copper wire @ 20° C in ohms per circular mil ft. is
8. permit current to flow: Conductance of an electric circuit is that property that will:
9. 1O ohms: The equivalent value of 0.1 mho is
10. directly proportional to its length: The resistance of copper wire is:
11. Feeder: The portion of a wiring system between a point of distribution and the branch circuit overcurrent device is
12. locking: GFCI protection at a carnival is not required for equipment at circuit if the receptacle is of the
type
13. 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.
14. located on a balcony accessible only to qualified persons located in
2 / 15 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
15. 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.
16. 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.
17. 50': What is the maximum run length of a 18AWG fixture wire that is tapped on to a 20 amp branch circuit?
18. 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
19. 2 in of concrete: Conductors are considered outside a buildings when they are buried under not less than
20. 8: In straight pull, the length of the box shall not be less than.
times the trade size of the largest raceway.
21. 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
22. 1000A: Ground-fault protection of equipment shall be provided from 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
23. 18": Receptacle outlets in
floors shall not be counted as part of the required number of receptacle outlets unless located
4 / 15 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
33. 8: Communications
Wires and cables shall have a vertical clearance of not less the feet from all points of roofs above which they pass.
34. Cable Tray: MV cable rated 35 KV cannot be installed in
35. in a straight line: The grounding of communications wires should be run to the grounding electrode:
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36. 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
37. 35KV: Dry type transformers installed indoors rated over.
shall be installed in a vault.
38. 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 less than 1 inch. Raceways spaced less that 1 inch apart shall be covered with a concrete to a depth of
39. 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
40. 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
41. 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.
42. 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
43. 3 inches: Branch circuit conductors within of a ballast shall have
an insulation temperature rating not lower than 90 degree Cor 194 degree F
44. 12 AWG: Communications
circuits shall have a minimum grounding conductor of AWG
7 / 15 three continuous white stripes on other than green insulation along its entire length
56. 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,
57. 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
58. 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?
59. USE: Type is a multi conductor cable identified for use as underground service-entrance cable
60. 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?
61. 18 feet: The minimum clearance for overhead feeder conductors not exceeding 600V that pass over commercial areas Subject to truck
traffic is.
62. 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
63. 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
64. 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.
65. 4": Open conductors installed outside shall be separated from open conductors of other circuits or systems by not less than
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66. 180 VA: For other than dwelling occupancies, banks, or office buildings, each receptacle outlet shall be calculated at
not less than VA.
67. 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.
68. 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
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
70. 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.
71. 5 times: Bending radius in type AC cable should be at
least the diameter of the AC Cable
72. 8 AWG: What is the minimum size of an overhead service drop
73. 8": What is the minimum thickness of a transformer vault floor made up with bricks or cement filled blocks
74. 30": What is the min Horizontal Climbing Space on a power conductors below communication conductors
75. 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
76. 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
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85. 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.
86. Shall or Shall Not: In the NEC, the words " " indicate a
mandatory requirement
87. 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
88. 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.
89. white with colored stripe other than green or distinguished by other suitable approved means:
Where conductors of ditterent 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
90. 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 ettective means. Such identification shall be placed at each point on the system where ·a connection is made if the grounded conductor is also present.
91. 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
92. 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
93. 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
94. Refrigerator or Electric Clock: A receptacle connected to one of the dwelling unit small appliance branch circuits can be
11 / 15 used to supply an in any of the rooms specified in 210.52(B)(l)
95. 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
96. 20 amp: There shall be a minimum of one branch circuit for laundry outlets required by 210.
97. 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.
98. 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.
99. Conductance: The reciprocal of resistance
100. Energy: A watt-hour meter is used to measure
101. 0.622": The internal diameter of 1/2"EMT is:
102. 116 Conductors: What is the Max number of #6 THHN current carrying conductors in 4" EMT for general use is
103. 40%: The total cross sectional area of conductors (not lead covered) in a new conduit.with four wires shall not exceed:
104. 1.5": The outside diameter of a threaded rigid conduit is measured to be about two Inches. The nominal trade size is:
105. 6": A field bend of a one inch rigid conduit, for RH wire, shall have a minimum radius of
106. Sizes are specified by Nominal inside Diameter: Concerning rigid conduit used for electrical work:
107. 13: How many receptacle outlets are permitted .on a 20A. 120V circuit in a commercial building?
108. 200 VA: For show-
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119. 4%: The maximum voltage drop from Service point to the last overcurrent device in a dwelling unit?
120. for the
practical safeguarding of persons and property: The NEC is
121. an electrical system essentially free from hazard: Compliance with the provisions of the NEC will result in
122. a. efficient use ,convenience, good service or future expansion·of electrical use: The Code
contains provisions considered necessary for safety, which will not necessarily result in
123. overloading of wiring systems by methods or usage not in conformity with the NEC,
initial wiring not providing for increases in the use of electricity: Hazards often occur because of
124. True: The Code isn't a design specification standard or instruction manual for the untrained and unqualified
125. signaling, electrical conductors, equipment, and raceways, communications: The following
systems shall be installed in accordance with the NEC requirements:
126. electrical conductors and equipment, optical fiber cables
within or on public and private buildings, outside conductors and equipment on the premises: The NEC applies to the installation of
127. True: The NEC does not cover electrical installations in ships, watercraft, railway rolling stock, aircraft, or automotive vehicles.
128. Accessible (as applied to equipment): Admitting close approach, not guarded by locked doors, elevation, or other
ettective means, is referred to as
129. accessible, readily.: Capable of being reached quickly for operation, renewal, or inspections without resorting to portable
ladders and such is known as
130. accessible (as applied to wiring methods): Capable of being removed or exposed without damaging the building
structure or finish, or not permanently· closed in by the structure or finish of the building is known as
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131. Ampacity: The current in amperes a conductor Can carry continuously, where the temperature will not be raised in excess of the
conductor's insulation temperature rating is called its_·
132. approved: Acceptable to the authority having jurisdiction means
133. connected: Bonded can be described as to establish electrical continuity and conductivity
134. Bathroom: A is an area that includes a basin with a toilet, tub, or shower.
135. main bonding: The connection between the grounded conductor and the
equipment grounding conductor at the service is accomplished by installing a(n) jumper.
136. Individual: A branch
circuit that supplies only one utilization equipment is a(n) branch circuit
137. cabinet: An enclosure for either surface mounting or flush mounting .provided with a frame in which
a door can behung is called a(n)
138. open: A circuit breaker is a device designed to open the circuit automatically on a predetermined overcurrent without damage to itself
when properly applied within its rating.
139. 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.
140. Controller: is a device that governs, in some predetermined manner, the electric power delivered to the apparatus to which it is
connected.
141. nonhabitable: A clothes closet is defined as a room or space intended primarily for storage of garments and apparel.
142. concealed: Cables are considered if rendered inaccessible by the structure or finish of the building
143. conduit body: A separate portion of a raceway system that provides access
through a removable cover to the interior of the system, defines the term
