Code Quiz 2

The grounding electron conductor of a grounded 400 amp AC system , when connected to a made electrode and which is the sole connection to the grounding electrode, is permitted to be a _________.

• #6 Copper

• #4 Copper

• #2 Copper

• #1/0 Copper

A piece of electronic equipment is required to be connected with an isolated equipment grounding conductor. The design is such that the metal raceway containing the supply conductors is to be isolated from the equipment enclosure, but the raceway contains an insulated copper equipment grounding conductor. Which of the following best describes Code requirements for this installation?

• The raceway shall not be isolated from the equipment.

• The isolation fitting may be located at the panelboard.

• The isolation fitting may be anywhere in the conduit run.

• The isolation fitting must be located at the equipment enclosure.

An electrically operated organ shall have both the generator and motor frames grounded or _________.

• the generator and motor shall be effectively insulated from ground and from each other.

• the generator and motor shall be effectively insulated from ground.

• the generator shall be effectively insulated from ground and from the motor driving it

• both the generator and motor shall have double insulation.

In communication circuits the bonding together of all separate electrodes ___________.

• shall not be permitted.

• shall be permitted with a minimum size jumper #4

• Shall be permitted with a minimum size jumper #6

• Shall be permitted with a minimum size jumper #8

Which of the following is NOT a true statement concerning an equipment grounding conductor?

• Under certain conditions, equipment grounding conductors may be required to be larger than circuit conductors.

• Under certain conditions, equipment grounding conductors may be run parallel.

• One size of equipment grounding conductors shall be increased to compensate for voltage drop.

• One equipment grounding conductor may serve multiple circuits

On a 4-wire delta-connected secondary where the midpoint of one phase is grounded to supply lightning and similar loads, the phase conductor having the higher voltage to ground shall be identified by _________.

I. Durably and permanently marked

II. An outer finish that is orange in color

III. Other effective means

• I only

• II Only

• III Only

• I, II, and III

The neutral of a solidly grounded neutral system shall be permitted to be grounded at more than one point for _________.

I. Services

II. direct buried portions of feeders employing a bare copper neutral

• I. Only

• II. Only

• III Only

• I, II, and III

Where extensive metal in or on buildings may become energized and is subject to personal contact _______ will provide additional safety.

• adequate bonding and grounding

• bonding

• suitable ground detectors

• none of these

A grounding electrode conductor shall not be required for a system that supplies a ______ circuit and is derived from a transformer rated not more than 100va

• Class 1

• Class 2

• Class 3

• all of these

The paralleling efficiency of ground rods is increased by spacing them ____________.

• 8'

• 10'

• 15'

• twice the length of the longest rod