Bonding And Grounding

Front 1

____ bonds the electrical systems grounding electrode system to the PBB (Primary Busbar)

Back 1

Telecomm Bonding Conductor (TBC)

Front 2

Copper conductor that interconnects the PBB to the SBB (Primary Busbar to Secondary Busbar)

Back 2

Telecomm Bonding Backbone (TBB)

Front 3

Recommended as a primary bonding design to accommodate the needs of the site

Back 3

Telecomm Bonding Backbone (TBB)

Front 4

Insulated, stranded copper conductor is used to equalize potentials between SBB's (Secondary Busbar) on the same floor of a structure

Back 4

Backbone Bonding Conductor (BBC)

Front 5

TIA-607-C recommends that a _____ be made on every third floor and the top floor

Back 5

Backbone Bonding Conductor (BBC)

Front 6

______ Connects equipment cabinets and racks to closest PBB or SBB.

Back 6

Telecomm Equipment Bonding Conductor (TEBC)

Front 7

Typical Connections on a busbar are made using _____

Back 7

Bolts or crimps

Exothermic Welding

Front 8

Lugs when possible will have _____

Back 8

2 hole

Irreversible

Inspection port

Front 9

______ is a set of conductors or conductive elements formed into a mesh grid

Back 9

Supplemental Bonding Network

Front 10

Integrity of bonding connections cannot always be easily determined because of:

Back 10

Distance

Access

Other parallel bond connections that often exist

Front 11

Visual inspection of bonding connections can reveal problems such as:

Back 11

Loose connections

Corrosion

Physical damage

System modifications

Front 12

It is essential for the installer to perform metering measurements upon completion of work with bonding and grounding. They should be made for

Back 12

2-point bonding resistance

True root mean square ac current

The dc current

The ac outlet wiring polarity/conductor impedance

Front 13

Recommended max. value for bonding resistance between the meter lead and busbar is _____

Back 13

0.1 ohms (100 milliohms)

Front 14

The presence of ac current on bonding conductors impacts personal safety and equipment performance, the cause of this unwanted current may be:

Back 14

Induction from nearby ac currents

Faulty wiring

Breakdown of ac circuit conductor insulation

Incorrect wiring condition at an ac outlet, subpanel, or other intermediate point in the ac electrical distribution system

Front 15

Wiring polarity/grounding impedance testers are useful to measure:

Back 15

Hot,neutral, and equipment grounding conductor impedance

Wiring polarity

Possible improper neutral/equipment ground bonds at outlets

Front 16

Basic function of telecomm circuit protectors:

Back 16

Arresting surges or overvoltages that come from exposed circuit pairs

Protecting against sustained hazardous currents that may be imposed

Front 17

3 types of telecomm circuit protectors

Back 17

Primary

Secondary

Data and Fire Alarm

Front 18

These must be installed as near as possible to the point at which the exposed cables enter the building, and grounding conductors must safely carry lightning and power fault currents

Back 18

Primary Protectors

Front 19

In addition to voltage protection this type must protect against sneak current.

Back 19

Secondary protectors

Front 20

Sneak current can be caused by

Back 20

Power faults, which are too low in voltage to operate primary protectors

Station equipment that will draw excess current and overheat station wire

Induction from power lines

Front 21

Though not required by codes, these modules must primary protection against lightning transients. They do not have the ability to protect against power faults

Back 21

Data and Fire Alarm Protectors

Front 22

A _____ is required where a circuit is exposed to electrical power faults and lightning

Back 22

Primary protector

Front 23

Interbuilding circuits have a lightning exposure unless any of the following conditions exist

Back 23

Interbuilding cable runs of 140 ft or less are directly buried or in underground conduit

The area has an average of 5 or fewer thunderstorm days per year (and earth resistivity is less than 0.1 ohms)

Circuits are in large metropolitan areas where buildings are close and high enough to intercept lightning

Front 24

_____ the original protectors.

An air gap between 2 elements is set to arc at 300V and 1000V and conducts a surge current to a grounding conductor.

Respond slowly at excess of 15 nanoseconds

Back 24

Carbon Blocks

Front 25

_____ are arresters that operate the same as carbon blocks, arcing over a gap to a grounding conductor. Arc at lower voltages providing better protection than a carbon block.

Reaction times of 10 to 15 ns

Back 25

Gas Tube

Front 26

_____ arresters rely on high-power semiconductor technology.

Reaction times are 3 to 5 ns

With clamping voltages of 150V to 300V

Back 26

Solid State

Front 27

Protector terminals should be located up to ______ away from the electrodes

Back 27

20ft (6.1m)

Front 28

Number of pairs for a minimum capacity 12AWG?

Back 28

1-2

Front 29

Number of pairs for a minimum capacity 10 AWG

Back 29

3-6

Front 30

Number of pairs for a minimum capacity 6AWG

Back 30

> 6

Front 31

Aside from the concern for the size of the protector ground conductor, the installer also must consider the variables that may affect the conductors impedance when exposed to ac transient events.

What are the variables

Back 31

Tightness of connections

Length of the conductor

Bend radius of the conductor

Number of bends in the conductor path

Front 32

Secondary protectors may include

Back 32

Heat Coil

Sneak current fuse

Positive temperature coefficient resistor

Front 33

All bonding conductors need to meet this criteria

Back 33

Green jacket

Shall not decrease in size as bending path moves closer to the termination point on the busbar

Bonded with 2 hole lug

No bend shall exceed 90°

minimum inside bend radius of 8in

(10x the diameter is recommended)

Front 34

Bonding conductors are given specific names to denote function. These are?

Back 34

TBC - Telecomm Bonding Conductor

TBB- Telecomm bonding backbone

BBC - Backbone bonding conductor

TEBC- telecomm equipment bonding conductor

Front 35

A _____ is a conductor used for the joining of metal parts together to firm an electrically conductive path

Back 35

Bonding Conductor

Front 36

Typical binding connections made to an SBB (Secondary Busbar)

Back 36

PBB- Primary Busbar

Cable tray

Ladder rack

Equipment racks and cabinets

Cable shields

Other conduits

Supplementary bonding network

Front 37

For the primary busbar in addition to the connection to the ac electrical grounding system, other connections can be made, what are they?

Back 37

Primary and secondary surge protectors

Cable tray

Equipment racks

Ladder racks

Branch circuit panels

Power conditioning equipment

Cable shields

Battery rack

Other conduits

Front 38

Primary busbar (PBB) should _____

Back 38

Be located in the EF

Be adjacent to telecomm circuit protectors

Serve equipment in the same room

Have an isolated mount

Be located to minimize bonding conductor length

Front 39

Busbar measurements

Back 39

4 inch tall

1/4 inch thick

Long as you need

2 inch standoff

(Space from wall)

Front 40

Telecomm bonding and grounding infrastructure is comprised of 4 general catagories

Back 40

Busbar

Bonding conductor

Connector

Supplemental bonding network

Front 41

Bonding and grounding infrastructure includes ________

And may include ________

Back 41

--Includes:

Telecomm Bonding Conductor (TBC)

Primary Busbar (PBB)

--May include:

Telecomm Bonding Backbone (TBB)

Telecomm Equipment Bonding Conductor (TEBC)

Secindary Busbar (SBB)

Backbone Bonding Conductor (BBC)

Front 42

Usually a rod, pipe, or plate in direct contact with the earth for the purpose of providing a low-impedance connection to the earth

Back 42

Grounding electrode

Front 43

Used to connect the grounding electrode to either the equipment grounding conductor, or to the grounded conductor of the circuit at the service equipment.

Back 43

Grounding Electrode Conductor

(GEC)

Front 44

The installer must recognize that the following 3 distinct yet interconnected grounding systems should be in place at every site

Back 44

Ac grounding electrode system

Equipment grounding system

Telecomm bonding infrastructure

Front 45

Bends of the bonding conductors terminating at the PBB or SBB shall have a minimum inside bend radius of:

Back 45

8in (200mm)

Front 46

Equalize voltages between metallic surfaces or equipment within telecomm spaces in the event of

Lightning

Electrostatic discharge

Electromagnetic induction

Ac electrical system faults

Back 46

Telecomm Bonding Infrastructure

Front 47

Establishes a zero voltage reference for ac electrical power systems

Provides a path for dissipation of currents due to lightning or accidental contact with higher voltage systems

Provides a path for the dissipation of electrostatic discharge currents

Back 47

Ac grounding electrode system

Front 48

Zero volts on all equipment enclosures

Intentional path for fault currents

Voltage reference for power supply

Back 48

Equipment grounding system