Ch 09 - Bonding And Grounding

Question 1

9–2 safety

Primary responsibility =

Answer 1

Safeguarding personnel, property

Question 2

9–2 safety

Results of disturbances =

Answer 2

Death or injury

Question 3

9–2 safety

Best time to design =

Answer 3

Initial planning and construction phases

Question 4

9–4 background

Bonding =

Answer 4

Between two metallic items

Question 5

9–6 ITS consideration

New construction =

Answer 5

Electrical contractor must provide means of access

Question 6

9–6 ITS consideration

Disconnect =

Answer 6

Qualified electrical maintenance person

Question 7

9–9 measuring the equipment grounding conductor impedance

Equipment grounding conductor can only be accurately measured =

Answer 7

Ground impedance tester

Question 8

9–10 isolated ground (IG)

IG type receptacle =

Answer 8

Orange triangle

Question 9

9–10 IG

IG systems =

Answer 9

Not recommended

Question 10

9–10 signal reference grid (SRG)

SRG =

Answer 10

Grounding and bonding for raised floors

Question 11

Fig 9.1a

SRG =

(2)

Answer 11

*Signal Reference Grid

*bonding conductor at least 2 pts

Question 12

Fig 9.1b

Answer 12

ground every fourth pedestal

Question 13

9–12 telecom bonding infrastructure

Bonding overall purpose =

Answer 13

Equalize potentials

Question 14

9–12 telecom bonding infrastructure

ANSI J-STD-607A =

Answer 14

Commercial building GROUNDING AND BONDING requirements for telecom

Question 15

9–16 entrance facility (EF)

EF =

Answer 15

TMGB

Question 16

9–16 EF

TMGB =

(3)

Answer 16

*Telecommunications main grounding

*0.25in x 4in

*located as near as possible to cable EF

Question 17

9–16 EF

BCT =

(4)

Answer 17

*Bonding conductor

*6 AWG

*30ft

*AC panel

Question 18

9–17 EF

BCT two alternatives =

Answer 18

* Structural steel

* conductor between IT TMGB and AC branch circuit panel board

Question 19

9–18 equipment room (ER)

TGB =

Answer 19

*Telecommunications grounding bar

*0.25in x 2in

Question 20

9–19 TR

TBB =

(3)

Answer 20

*Telecommunications bonding backbone

* costly to achieve

* Long length

Question 21

9–20 sizing bonding conductor

6AWG =

Answer 21

Does not exceed 100 feet

Question 22

9–23 bonding connections

Bonding typical connections =

(2)

Answer 22

* Compression

* exothermic welding

Question 23

9–24 bonding connection inspection

Visual inspection =

Answer 23

Except impedance (does not belong)

Question 24

9–26 lightning exposure

Lightning exposure =

(3)

Answer 24

* Circuits in large metropolitan

* 140ft

* 5 or fewer thunderstorm days per year

Question 25

Figure 9.7

(2)

Answer 25

*Zone protecion

*2 story

Question 26

Fig 9.8

(2)

Answer 26

*cone protection

*1 story

Question 27

9–28 lightning exposure

Direct buried cable collects =

Answer 27

* Ground strikes

* 6.5ft to 20ft

Question 28

9–31 standards

ANSI J/STD-{670-A} =

Answer 28

Bonding and grounding (earthing) commercial bldgs

Question 29

9–31 standards

ANSI/TIA/EIA-{568-B.1-2} =

Answer 29

Grounding and bonding for horizontal cabling

Question 30

9–31 standards

IEEE 1100 =

Answer 30

Powering and grounding electronic equipment

(covers sensitive systems)

Question 31

9–32 standards

LPI =

Answer 31

NFPA 780

Question 32

9–32 standards

NFPA 70 =

Answer 32

Publishes and NFPA 70 ~ NEC

Question 33

9–32 standards

NFPA 780 =

Answer 33

Standard lightning protection