NEC 110.12(B) warns against the possible damage to electrical equipment due to paint, plaster, cleaners, abrasives, or corrosive residues.
Select one:
True
False
The correct answer is 'True'.
When the term voltage is used throughout the Code, it means the voltage at which the
circuit ? .
a. is approved
b. is protected from overcurrent
c. is rated
d. operates
NEC Reference
The correct answer is: operates
The correct answer is: 110.4
One of the ways that conductor sizes are expressed in the NEC is by using ? .
a. American Wire Gage or circular-mils
b. resistance or Ω
c. square-mils
d. color of conductor insulation
NEC Reference
The correct answer is: American Wire Gage or circular-mils
The correct answer is: 110.6
Electrical equipment shall be installed in a neat and workmanlike manner.
a. True
b. False
NEC Reference
The correct answer is: True
The correct answer is: 110.12
A piece of electrical equipment with a UL label on it shall be installed in accordance with any ? included in the listing or labeling.
a. field marks
b. hardware
c. instructions
d. lists
NEC Reference
The correct answer is: instructions
The correct answer is: 110.3(B)
When the word conductor is not identified with a material, it indicates the use of ? .
a. aluminum
b. aluminum or copper-clad aluminum
c. copper
d. copper, aluminum, or copper-clad aluminum
NEC Reference
The correct answer is: copper
The correct answer is: 110.5
Manufacturers are required to mark their products so the manufacturer can be identified.
The marking may consist of manufacturer’s ? .
a. information about the material the product is made of
b. name and information about the material the product is made of
c. trademark
d. trademark or name
NEC Reference
The correct answer is: trademark or name
The correct answer is: 110.21(A); 110.21(A)(1)
Which of the following is/are required relating to the general requirement for
identification of a disconnecting means that is not located and arranged so that its
purpose is evident?
a.Each disconnecting means must be legibly marked to indicate its purpose.
b.The marking must be of sufficient durability to withstand the environment involved.
c.Both a. and b.
d.Neither a. nor b.
The correct answer is: Both a. and b.
Unused openings in boxes are generally required to be ? .
a. approved
b. closed
c. identified
d. used
NEC Reference
The correct answer is: closed
The correct answer is: 110.12(A)
The width of the working space in front of electrical equipment 1,000 volts or less shall ? .
I. allow at least a 90° opening of equipment doors
II. allow at least a 180° opening of all equipment doors
III. not be less than 30" wide or the width of the equipment (whichever is greater)
IV. not be less than 36" wide or the width of the equipment (whichever is greater)
a. I. only
b. I. and III.
c. II. and IV.
d. III. only
NEC Reference
The correct answer is: I. and III.
The correct answer is: 110.26(A)(2)
NEC 110.14(B) requires a splice in a conductor to be covered with an insulation ? .
a.as thick as the conductor’s insulation
b.equivalent to the conductor’s insulation or with an identified insulation device
c.of the same material as the conductor
d.thicker than the conductor's insulation
The correct answer is: equivalent to the conductor’s insulation or with an identified
insulation device
Which statement(s) is/are true according to NEC 110.14(A) for terminals?
a.Terminals for more than one conductor shall be so identified.
b.Terminals used to connect aluminum conductors shall be so identified.
c.Both a. and b.
d.Neither a. nor b.
The correct answer is: Both a. and b.
Which statement(s) is/are true according to NEC 110.13(A) and (B)?
a.Electrical equipment provided with ventilating openings shall be installed so that the
ventilated openings are not obstructed.
b.Electrical equipment shall be firmly secured to the surface on which it is mounted.
c.Both a. and b.
d.Neither a. nor b.
The correct answer is: Both a. and b.
The temperature rating associated with the ampacity of a conductor shall be so selected and coordinated as to not exceed the lowest temperature rating of any connected ? .
a. conductor
b. termination
c. device
d. all of the above
NEC Reference
The correct answer is: all of the above
The correct answer is: 110.14(C)
On a 4-wire, delta-connected system where the midpoint of one phase winding is
grounded to supply lighting and similar loads, the conductor or busbar 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.
a. green
b. light blue
c. orange
d. red
NEC Reference
The correct answer is: orange
The correct answer is: 110.15
Electrical equipment such as switchboards, switchgear, panelboards, industrial control
panels, meter socket enclosures, and motor control centers, that is in other than dwelling units, and is likely to require examination, adjustment, servicing, or maintenance while energized, shall be ? to warn qualified persons of potential electric arc flash hazards.
a. engraved
b. field or factory marked
c. identified
d. marked
NEC Reference
The correct answer is: field or factory marked
The correct answer is: 110.16(A)
Each disconnecting means shall be legibly ? to indicate its purpose unless located and arranged so the purpose is evident.
a. engraved
b. field marked
c. identified
d. marked
NEC Reference
The correct answer is: marked
The correct answer is: 110.22(A)
Why does the NEC specify that sufficient access and working space shall be provided and maintained about all electric equipment?
a. To permit cleaning crews safe access around the electrical equipment
b. To permit ready and safe operation and maintenance of such equipment
c. To permit safe operation at 1,000 V and above
d. To permit safe operation at 1,000 V, nominal, or less
NEC Reference
The correct answer is: To permit ready and safe operation and maintenance of such
equipment
The correct answer is: 110.26; 110.32
For equipment rated ? or more and over six feet wide, that contains overcurrent
devices, switching devices, or control devices, there shall generally be one entrance to and egress from the required working space not less than 24 inches wide and 6 / feet high at each end of the working space.
a. 200 A
b. 600 A
c. 1,200 A
d. 1,600 A
NEC Reference
The correct answer is: 1,200 A
The correct answer is: 110.26(C)(2)(1)
All switchboards, switchgear, panelboards, and motor control centers shall generally be located in ? spaces and protected from damage.
a. accessible
b. dedicated
c. guarded
d. open
NEC Reference
The correct answer is: dedicated
The correct answer is: 110.26(E)
For electrical equipment rated 1,000 volts, nominal or less, the space equal to the width and depth of the equipment and extending from the floor to a height of ? above the
equipment or to the structural ceiling, whichever is lower, shall generally be dedicated to the electrical installation.
a. 6'
b. 10'
c. 25'
d. 30'
NEC Reference
The correct answer is: 6'
The correct answer is: 110.26(E)(1)(a)
In general, the Code requires that live parts of electrical equipment operating at ? to
1,000 volts, nominal, shall be guarded against accidental contact.
a. 24 V
b. 50 V
c. 120 V
d. 600 V
NEC Reference
The correct answer is: 50 V
The correct answer is: 110.27(A)
Service equipment at other than dwelling units shall be legibly marked in the field with the available fault current. The field marking(s) shall include ? and be of sufficient durability to withstand the environment involved.
a. the date the calculation was performed
b. the date the fault-current calculation was performed
c. the name of the engineer or engineering firm that performed the calculation
d. the name of the individual that performed the calculation
NEC Reference
The correct answer is: the date the fault-current calculation was performed
The correct answer is: 110.24(A)