big one 1-20 Flashcards
________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.
a. Definite time
c. Adverse time
b. Inverse time
d. Thermal magnetic
Inverse Time
An insulated grounded conductor of _____or smaller shall be identified by a continuous white or gray outer finish, or by three continyous white stripes on other than green insulation along its entire length.
a. 8 Awg
c. 4 Awg
b. 6 Awg
d. 3 Awg
6 AWG
Equipment associated with the electrical installation can be located above or below other electrical equipment within their working space when the associated equipment does not extend more than _____from the front of the electrical equipment.
a. 3 inches
c. 12 inches
b. 6 inches
d. 24 inches
6 “
110.26 (A) (3)
How many receptacles are required within the perimeter of a balcony, deck or porch with a usuable area of less than 20 SQ. feet.
a. 1
c. 3
b. 2
d. none
1
210.52
The minimum headroom of working spaces about motor control centers is _____.
a. 3 Ft.
c. 6 Ft.
b. 5 1/2 Ft.
d. 6 1/2 Ft.
6-1/2
110.26 (E)
At least one entrance to enclosures for electrical installations shall not be less than _____wide and ____high shall be provided to give access to the working space around the electrical equipment over 600 volts nominal.
a. 24 inches / 6 feet
c. 30 inches / 6 feet
b. 36 inches / 6 1/2 feet
d. 30 inches / 6 1/2 feet
30 inches / 6 1/2 feet
110.26
What is the minimum height for a vertical overhead clearance for a service drop conductor over residential property and driveways with garage, not subject to truck traffic where the voltage does not exceed 300 volts to ground.
a. 10 Feet
c. 12 Feet
b. 18 Feet
d. 15 Feet
12’
230.12
Open conductors installed outside shall be separated from open conductors of other circuits or systems by not less than____.
a. 12 inches
c. 18 inches
b. 4 inches
d. 24 inches
4 “
225.14 (C)
What is the minimum thickness of a transformer vault floor made up with bricks or cement filled blocks
a. 4 inches
c. 6 inches
b. 10 inches
d. 8 inches
8”
450.52
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.
a. 18
c. 24
b. 14
d. 12
12”
300.50
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.
a. 115 %
c. 150 %
b. 125 %
d. 250 %
125%
430.22
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 it is in one line, and at least __ Feet in front of the board if boards are installed facing each other.
a. 5 / 7
c. 6 / 8
b. 7 / 5
d. 4 / 7
5 / 7
230.64
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 __inches from the floor to any energized part of the switchboard, except by special permission.
a. 6
c. 10
b. 8
d. 12
12”
Bending radius in type AC cable shall be made such that the cable is not damaged. The radius of the curve of the inner edge of any bend shall not be less than ____times the diameter of the type AC cable.
a. 6
c. 5
b. 3
d. 8
5
334.24
What is the minimum size Overhead service drop conductors in copper ?
a. # 6 AWG
c. # 8 AWG
b. # 2 AWG
d. # 4 AWG
8 AWG
230.31
