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Exam 7: Introduction to Residential Service Entrances

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Question 1

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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

E) B) and D)
F) None of the above

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Question 2

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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

E) A) and B)
F) None of the above

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Question 3

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Service entrance cables must be supported by straps or staples within __________ inches of any electrical enclosure or weatherhead and at intervals not exceeding __________ inches.

Ground rods must be at least ________ feet long.

Article _______________ of the NEC covers the grounding and bonding requirements for residential services.

The __________ is the conductor used to connect the system grounded conductor to a grounding electrode.

A system or circuit conductor that is intentionally grounded is called a(n) _______________ conductor.

If a service entrance is rated at 200 amperes, the service entrance conductor size would be a minimum of 2/0 copper or 4/0 aluminum.According to Table 250.102(C) (1) the minimum grounded conductor or bonding jumper size would be _____ AWG.

A piece of electrical equipment used by the utility company to step down the high voltage of the utility system to the 120/240 volts required for a residential electrical system is called a(n) _______________.

The _______________ conductor of an AC service is connected to a grounding electrode system to limit the voltage to ground from lightning, line surges, and unintentional high-voltage crossovers, and to stabilize the voltage to ground during normal operation.

Underground service conductors installed as a cable assembly are required to be buried at least __________ feet by the NEC.

A metal underground water pipe in contact with the earth for 10 feet or more is permitted to be the only grounding electrode needed to meet NEC requirements.

Who is the final authority for determining the required vertical clearances for service conductors?

Where service entrance conductors extend from the weatherhead, a _______________ is required to keep water from entering the weatherhead and getting into the meter enclosure.

Grounding electrode conductors in contact with the earth do not need to comply with the Section 300.5 rules for burial depths when being installed underground but need to be buried or otherwise protected if they are subject to physical damage.

When a ground ring is used as a grounding electrode, it must be at least a 2 AWG copper conductor at least __________ feet long.

Service conductors are considered outside of a house when they are installed under at least 2 inches (50 mm) of concrete beneath a house; where installed in a conduit under at least 18 inches (450 mm) of earth beneath a house; or where they are installed in rigid metal conduit (RMC) or intermediate metal conduit (IMC) when used as a service mast that extends through an eave.

Where more than one ground rod, pipe, or plate is used, the grounding electrodes must be at least __________ feet apart.

Outdoor light fixtures are permitted to be attached to trees.

The type of cable normally used as the service drop for a 120/240-volt residential service entrance is called __________.