Ch. 9 * (Bonding & Grounding) Flashcards Preview

RCDD > Ch. 9 * (Bonding & Grounding) > Flashcards

Flashcards in Ch. 9 * (Bonding & Grounding) Deck (29)
0

A primary responsibility of the ITS designer

Safeguarding personnel, property and equipment

1

Safeguard against ___ due to electrical shock

Death or injury

2

Device used to test the impedance of the equipment grounding conductor

Ground impedance tester

3

Ground every ___ floor pedestal

4th

4

Commercial building grounding and bonding standard

607-A

5

TMGB

Telecommunications Main Grounding Busbar

6

Minimum dimension of TMGB

.25" X 4"

7

Ground wire

6 AWG

8

BCT

30'

9

Bonding in the EF

Not cold water pipe

10

TGB dimensions

.25" X 2"

11

Consider the TBB for a large site may be ___

Costly to achieve

12

Typical bonding connections

Compression-type
Exothermic welding
Clamps

13

Visual inspection

Loose connections
Corrosion
Physical damage
System modifications
Except "impedance"

14

Direct-buried cable collects ground strikes within a distance of ___

6.5' - 20' determined by soil resistance

15

Lightning Protection Institute

Based on NFPA 780

16

NFPA 70

NEC (national electric code)

17

Standard for installation of lightning protection systems

NFPA 780

18

Lightning exposure exceptions

Metropolitan
140' or less
Five or fewer thunderstorms per year
Earth resistivity less than 100 ohm-meters

19

Distance limitation for 6 AWG

100'

20

Purpose of grounding

Equalize potentials

21

SRG

Raised floor (grounding and bonding)

22

IG

Isolated Ground

23

IG receptacle

Orange triangle

24

Bonding

Two metallic items

25

Water pipes ___ be used as a ground

Should never

26

IEEE standard for power and grounding

1100

27

Max DC current on bonding conductor

500 mA

28

Impedance of the equipment grounding conductor

As low as possible