Residential Wiring Chap.7 Quiz

Equipment is a general term used for material, fittings, devices, appliances, lighting fixtures, apparatus, machinery, and other parts used in connection with an electrical installation.

• True

• False

When installing service drop conductors above a residential roof, the general rule is that conductors must have a vertical clearance of at least __________.

• 10 feet

• 8 feet

• 3 feet

• 5 feet

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

• 3

• 1

• 2

• 4

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.

• 12 inches

• 24 inches

• 18 inches

• 8 inches

When a metal underground water pipe is used as a grounding electrode, it must be in contact with the earth for at least __________ feet.

• 12

• 10

• 5

• 8

Ground rods must be at least __________ feet long.

• 10

• 8

• 12

• 6

According to NEC Table 250.66, the minimum size copper grounding electrode conductor for a service entrance installed with 4/0 copper conductors is __________.

• 2AWG

• 8AWG

• 6AWG

• 4AWG

Overhead service conductors are not permitted to be attached to trees for support

• True

• False

Tags

NGSS.MS-ETS1-1

A metal underground water pipe in contact with the earth for 20 feet is permitted to be the only grounding electrode needed to meet NEC requirements.

• True

• False

If a single grounding electrode that is a rod, pipe, or plate does not have resistance to earth of 25 ohms or less, an additional electrode may be installed.

• True

• False