Electrician Exam 2
Metal conduit installed in indoor wet locations must have a MINIMUM airspace clearance of_______ between the conduit and the wall or supporting surface.
1/4 inch 300.6(D), 70-144
In general, branch-circuit conductors serving continuous loads, such as luminaires in an office building or any commercial establishment, shall have an ampacity of NOT less than_______ of the load.
125 percent 210.19(A)(1)(a), 70-65
As a general rule, branch-circuit conductors that supply a single AC motor used in a continuous-duty application shall have an ampacity of NOT less than________ percent of the motor's full-load running current rating.
125% Article 430.22, 70-313
Disregarding exceptions, the overcurrent protection for size 12 AWG copper conductors, regardless of the insulation type, shall NOT exceed_________
20 amperes 240.4(D)(5), 70-99
A kW rated 208-volt, 3-phase electric steamer is to be installed in the kitchen of a commercial establishment, the steamer will withdraw_______ of current.
25 amperes (24.9) 208 x square root of 3 (1.732) = x/9kW
When exceptions are not a consideration, electrical metallic tubing (EMT) shall be securely fastened within_________ of each junction box, panelboard, or other conduit termination.
3 feet Article 358.30(A), 70-219
How much clear working space is required to be maintained between a 3-phase 480Y/277-volt main switchboard and a concrete block wall?
3 feet, 6 inches Table 110.26(A)(1), Condition 2, 70-50
The MINIMUM required width of the working space in front of panelboards, switchboards, disconnects, and motor controllers, rated 1000 volts or less, shall be the width of the equipment or NOT less than ________, whichever is greater.
30 inches 110.26(A)(2), 70-50
Generally, the ampacity of the of a size 8 AWG THWN copper conductor is
50 amperes Table 310.16, 70-161
The NEC permits electrical trade size 3/8 inch flexible metal conduit (FMC) to be used for tap conductors (fixture whips) to luminaires, provided the length of the FMC does NOT exceed
6 feet 348.20(A)(2)c, 70-208
Unless listed and identified otherwise, terminations and conductors of circuits rated 100 amperes or larger shall be rated at
75 degrees Celsius Article 110.14(C)(1)(b)(1), 70-48
An electrical metallic tubing (EMT) 50 feet in length to be installed will contain a total of nine(9) conductors. Six (6) of the wires are considered to be current-carrying. What is the adjustment factor, in percent, that must be applied to the ampacity of the current-carrying conductors?
80 percent Table 310.15(C)(1), 70-160
Where branch-circuit conductors supplying a fluorescent or HID luminaire are controlled within the ballast compartment and are within 3 in. of the ballast, the conductors are required to have an insulation temperature rating NOT lower than
90 degrees Celsius Article 410.68, 70-281
A motor with nine leads coming out is a________ motor
Dual-voltage
When an insulated black-colored conductor is identified by three(3) continuous white or gray strips along it's entire length, it is considered an
Grounded conductor Article 200.7(A)(2), 70-59
When inverse time circuit breakers are used to switch 120-volt and 277-volt, high-intensity discharge lighting branch-circuits, the circuit breakers shall be listed and marked
HID (High-intensity discharge) Article 240.83(D), 70-107
The reason the NEC requires all grounded and ungrounded conductors of a common circuit to be installed together in the same ferrous metal raceway is to reduce_______
Inductive heat Article 300.2(A), 70-147
For continuous-duty motors, the motor nameplate rating is used to determine the size of the_______ required for the motor.
Motor overload protection Article 430.6(A)(2), 70-309
Under normal conditions, an equipment grounding conductor will
Not carry current Article 100, 70-36
On a four-wire, delta-connected system, the conductor having the higher voltage to ground(high-leg) shall be identified as__________ in color, if the grounded conductor is also present to supply lighting similar loads.
Orange Article 110.15, 70-48
Where the premises wiring systems has branch-circuits supplied from more than one nominal voltage system, each ungrounded conductor of a branch-circuit shall be identified________ at the panelboard.
Phase and system Article 210.5(c)(1), 70-60
Electrical equipment rooms or enclosures housing electrical apparatus of not over 1,000 volts that are controlled by a lock(s) shall be considered accessible to
Qualified persons only 110.26(F), 70-52
As a general rule, when the ampacity of a specific conductor does not match the rating of a listed standard overcurrent device, _______ of the NEC permits the use of the next standard overcurrent device where loads are 800 amperes or less.
Section 240.4(B) 70-98
When an electrical trade size 3/4 inch electrical metallic tubing (EMT) is in excess of 24 inches in length, the conduit is permitted to contain NO more than _________ size 10 AWG conductors with THWN insulation.
10 Annex C, Table C.1, 70-731
The current load on a size 8 AWG THHN 90 degree copper conductor is limited to_________ where connected to a disconnect switch with terminals rated 60 degrees Celsius.
40 amperes Article 110.14(C), 70-48
