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Residential Wiring Exam Questions and Answers 2024
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Residential Wiring Exam Questions and Answers
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Residential Wiring Exam Questions andAnswers
Define the Service Point - Answer -NEC Article 100
The point of connection between the facilities of the serving utility and the premises
wiring. Utility provides electricity from the supply side because they are giving it to us
and we receive it on the load side.
Define the service-drop conductors - Answer -NEC Article 100
The overhead conductors between the serving utility and the serving point. These
conductors are installed, maintained, and owned by electrical utility.
Who is responsible for determining the service location? - Answer -Electric utility
a. The service head must be located (above) (below) the point where the service-drop
conductors are spliced to the service-entrance conductors - Answer -Above
b. What code section provides the answer to part (a) - Answer -NEC Article 230.26
What is a mast-type service entrance? - Answer -The most common method for
installing an overhead service entrance. Most commonly used in areas where the
electric utility distribution system has not been installed underground. Lies beneath the
service head.
When a conduit is extended through a roof, must it be guyed? - Answer -Only for extra
support
a. What size and type of conductors are installed for the service in this text? - Answer -
Panelboard A: 2 AWG, 4 AWG, and 6 AWG
Panelboard B: 3 AWG and 8 AWG
b. What size conduit is installed? - Answer -Panelboard A: size 2 and size 1 for the
other two
Panelboard B: Size 3 and size 1
What size grounding electrode conductor is installed? - Answer -4 AWG copper
grounding electrode conductor (GEC)
Is the grounding electrode conductor insulated, armored, or bare? - Answer -Armored
, How and where is the grounding electrode conductor attached to the water pipe? -
Answer -With a listed ground clamp to the metal water pipping where the pipping comes
through the basement wall.
a. Overhead service conductor clearance over private driveway: - Answer -12 ft
minimum
b. Overhead service conductor clearance over private sidewalks: - Answer -10 ft
minimum
c. Overhead service conductor clearance over alleys: - Answer -18 ft minimum
d. Overhead service conductor clearance over a roof having a roof pitch of not less than
4/12 (voltage between conductors does not exceed 300 volts): - Answer -
e. Overhead service conductor horizontal clearance from a porch: - Answer -
f. Overhead service conductor clearance from a fence that can be climbed on: - Answer
-10 ft minimun
What is the minimum size ungrounded conductors using copper conductors that have
type THW insulation for the following residential electrical services? (100 amperes) -
Answer -310.16: 4 AWG
310.12: 3 AWG
What is the minimum size ungrounded conductors using copper conductors that have
type THW insulation for the following residential electrical services? (200 amperes) -
Answer -310.16: 3/0
310.12: 2/0
What is the minimum size ungrounded conductors using copper conductors that have
type THW insulation for the following residential electrical services? (400 amperes) -
Answer -310.16: 500
310.12: 400
What is the minimum size copper grounding electrode conductor for each TWH
insulation? (100 amperes) - Answer -
A surge protective device for the service is required to be of which of the following
types?
a. Type 1
b. Type 2
c. Type 3
d. Type 4 - Answer -a. Type 1
b. Type 2
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