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Text Book: Article 230
House Wiring: Chapter 7, pages 174-204
Multiple
Choice
Identify the choice that best completes the
statement or answers the question.
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1.
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The overhead service conductors from the last pole to the point connecting them
the service entrance conductors at the building are called __________ conductors.
a. | service drop | b. | riser | c. | service
lateral | d. | None of the above |
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2.
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The point of connection between the wiring of the electric utility and the house
wiring is called the __________.
a. | service drop | b. | service lateral | c. | service
point | d. | service conductors |
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3.
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When installing service drop conductors above a residential roof, conductors
must have a vertical clearance of at least __________. (General Rule)
a. | 3 feet | b. | 5 feet | c. | 8
feet | d. | 10 feet |
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4.
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The NEC requires a clearance of at least __________ feet above final grade for
service conductors where they are connected to the building, above sidewalks and other areas
accessible to pedestrians.
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5.
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The NEC requires a minimum clearance of __________ feet above residential
property and driveways where the voltage to ground does not exceed 300 volts.
a. | 18 | b. | 10 | c. | 15 | d. | None of the
above |
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6.
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The NEC requires a vertical clearance of at least __________ feet above public
streets, alleys, roads, and parking areas subject to truck traffic.
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7.
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Underground service conductors are required to be buried at least __________
feet by the NEC.
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8.
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Direct buried conductors emerging from the ground must be protected to a point
at least __________ feet above finished grade.
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9.
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When a warning ribbon is required to mark the location of buried underground
service conductors, it must be placed at least __________ above the buried conductors.
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10.
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Service entrance cables must be supported by straps or staples within __________
inches of any electrical enclosure and at intervals not exceeding __________ inches.
a. | 8, 24 | b. | 12, 24 | c. | 8,
30 | d. | 12, 30 |
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11.
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One set of service entrance conductors is permitted to supply __________ service
disconnecting means in lieu of a single main disconnect.
a. | 2 to 4 | b. | 2 to 6 | c. | 3 to
6 | d. | 3 to 5 |
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12.
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Ground rods must be at least __________ feet long.
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13.
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Where more than one ground rod, pipe, or plate is used, the grounding electrodes
must be at least __________ feet apart.
a. | 4 | b. | 8 | c. | 10 | d. | None of the
above |
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14.
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A(n) __________ is a conducting object through which a direct connection to the
earth is established.
a. | bond wire | b. | grounding electrode | c. | main bonding
jumper | d. | grounded conductor |
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15.
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A(n) __________ is the conductor connected to the neutral point of a system and
is intended to carry current under normal conditions.
a. | grounding conductor | b. | ungrounded conductor | c. | service
conductor | d. | neutral conductor |
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16.
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The type of cable normally used as the service drop for a residential service
entrance is called __________.
a. | quadplex cable | b. | Romex | c. | triplex
cable | d. | UF cable |
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17.
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When bonding together the noncurrent carrying metal parts of a service entrance,
which of the following methods may be used?
a. | exothermic welding | b. | listed pressure connectors | c. | listed
clamps | d. | all of the above |
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18.
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The __________ is the conductor used to connect the grounding electrode to a
system conductor or equipment.
a. | grounding electrode conductor | b. | grounding conductor | c. | neutral
conductor | d. | service conductor |
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19.
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According to NEC Table 250.66, the minimum size copper grounding electrode
conductor for a service entrance installed with 4/0 copper conductors is __________.
a. | 8 AWG | b. | 6 AWG | c. | 4
AWG | d. | 2 AWG |
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20.
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The conductors that run overhead from the utility transformer to the residence
are called the __________.
a. | service entrance cable | b. | service drop conductors | c. | service
laterals | d. | SEU cable |
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Match each item listed with the letter in the residential service entrance
drawing.  a. | meter socket | f. | bonding
jumper | b. | main breaker | g. | neutral bar | c. | neutral | h. | hot | d. | ground electrode
| i. | weather
head | e. | hot |
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21.
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meter socket
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22.
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main breaker
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23.
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neutral
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24.
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ground electrode
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25.
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hot
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26.
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bonding jumper
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27.
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neutral bar
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28.
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hot
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29.
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weather head
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