Deck 3: Grounding and Bonding and the 2011 National Electrical Code, Articles 250, 800, 810, and 820

Question 1

A ground rod connected to the earth protects against ground faults.

Answer 1

False

Question 2

A metal gas pipe is a suitable ground but only for communication equipment operating at 30V or less.

Answer 2

False

Question 3

The ground resistance of a single electrode should have a resistance to earth of not less than 25ohms.

Answer 3

True

Question 4

A bonding jumper for a supplemental grounding electrode is required to be not smaller than 14 AWG.

Question 5

A chassis ground provides safety from ground faults and possible short circuits.

Question 7

The maximum harmless current intensity for the human body is ______.

A) 5 mA
B) 10 mA
C) 500 mA
D) 1 A

Question 8

The ________ provides the conductive path to connect the non-current carrying parts of equipment together.

A) Grounded Conductor
B) Chassis Ground
C) Equipment Grounding Conductor
D) All the above

Question 9

All electrical systems and cables need to maintain at least _________ of separation from the lightning protection system.

A) 2 ft
B) 6 ft
C) 20 ft
D) 50 ft

Question 10

Not all clamps used for grounding and bonding need to be listed or labled.

Question 12

The following electrodes are permitted for grounding.

A) Interior metal water piping (within 5ft)
B) Metal frame of the building
C) Concrete encased electrode
D) All the above

Question 13

The length of the primary protection bonding jumper shall not exceed __________.

A) 2 ft
B) 6 ft
C) 12 ft
D) 20 ft

Question 14

The grounding electrode conductor is typically green in color.

Question 15

The NEC defines the term ground as "the earth".

Question 17

Which Article of the NEC covers grounding and bonding?

A) Article 250
B) Article 770
C) Article 800
D) Article 810

Question 18

When running coaxial cable systems, the outer conductive shield must be interrupted as close as possible to the point of entrance to the building.

Question 19

Alternating current systems less than 50V must always be grounded.

Question 20

Explain the term ground fault.

Question 25

List three methods permitted for attaching EGC's and bonding jumpers to equipment.

Question 26

List four suitable grounding electrodes for communication systems _________.

Question 27

Explain the difference between a main lug panelboard and a main circuit breaker panelboard _______.

Question 28

Describe the difference between a circuit neutral and a chassis ground.

Question 29

List the three conditions in which systems operating at 50V or less must be grounded.