Chapter 6 Bonding and Grounding (Earthing)

Question 1

Grounding (Earthing)

Answer 1

The establishment of a reference for the electrical source

Question 2

Bonding

Answer 2

Connection intended to safely equalize the potential defferences between two metallic items

Question 3

GPR (Ground Potential Rise)

Answer 3

A voltage created when current passes through the resistance of the soil

Question 4

When to bond

Answer 4

Every other pedestal will need a ground rod, at the greatest 1001’, aerial every 500’

Question 5

Direct bury and power separation

Answer 5

3.28 feet

Question 6

NFPA Standard 780

Answer 6

Lightning protection cone zone

Question 7

Three-Point, Fall of Potential Method

Answer 7

Most common method used to measure the resistance of ground

Question 8

Common Types of Grounding

Answer 8

Ground Rods
Concrete encased electrodes (Ufer Ground)
Building Ground Rings
Ground Grid
Metallic Water pipes
Structural Steel
Galvanized strap
Chemically filled tubes

Question 9

Materials for Grounding

Answer 9

Copper
Copper Clad
Steel
Galvanized Steel
Stainless Clad Steel
Stainless Steel

Question 10

Standard ANSI 607

Answer 10

Bonding and grounding of telecommunication systems
Primary Protector
Primary bonding bus bar (PBB)
Telecommunication bonding conductor (TBC)

Question 11

Bonding at the Entrance Facility (EF)

Answer 11

PBB, Primary Protector, electrical panel

Question 12

Direct Buried Cable Bonding Requirements

Answer 12

6 AWG solid copper
less than 1M 3.28’ separation from power
Above ground over 6’ separation not needed

Question 13

Strand Bonding

Answer 13

every .40KM or .25 mile
At each branch
At the beginning and end of an aerial section

Question 14

Aerial to Underground bonding

Answer 14

Ground every 1001’ or at the last pole