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RCDD > €h 05 - Horizontal Distribution System > Flashcards

€h 05 - Horizontal Distribution System Flashcards

1
Q

5-1 horizontal pathways

Continuous pathways =

(2)

A

*Conduit

* containment

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2
Q

5–1 horizontal pathway

Non continuous pathways =

A

J-hook

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3
Q

5–7

Wet locations =

(3)

A

* Sand

* gravel

* soil

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4
Q

5–9 considerations for horizontal pathways

Planning purposes =

A

Hallways

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5
Q

5–9 maximum occupant density

Work area (WA) =

A

* 100 ft.²

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6
Q

5–9

BAS =

(3)

A

* Building automation system

* 250ft.2

* pathway capacity - 1 cable each system

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7
Q

5–10 cable diameter

4 pr cable =

A

.35in

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8
Q

5–10 cable diameter

2-fiber cable =

A

.18in

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9
Q

5-14 unsuitable conduit

Flexible conduit =

(4)

A

*Creep

* shift

* sheath damage

*not recommended

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10
Q

5–14 unsuitable conduit

If flexible conduit must be used =

A

Size increase by one trade size

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11
Q

5-14 acceptable conduit runs

ITS design =

A

Best direct route

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12
Q

5–14 acceptable conduit runs

Continuous section =

A

No longer than 100 feet

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13
Q

5–14 acceptable conduit runs

Pull boxes/pull points =

A

More than 100 feet

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14
Q

5–15 unacceptable conduit runs

Conduit should not be run =

A

Near heat sources

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15
Q

5-15 unacceptable conduit runs

Aluminum or ENT =

A

never be placed in concrete floors

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16
Q

5–19 recommended conduit capacity

Cross-section area formula =

A

.785 x diameter²

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17
Q

5–19 recommended conduit capacity

Q: what is the cross-sectional area if the diameter of the cable is .35? =

A

.785 x (.35)² = .0962

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18
Q

5–19 been radii for conduits

4 pair cable =

A

4 times

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19
Q

5–19 bend radii

Multi-pair copper cable=

A

10 times

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20
Q

5–19 been radii

TBB cable=

A

8 times

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21
Q

5–20 design with conduit bends

If run requires (2) 90° bends =

A

Pull point

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22
Q

5–20 designs with conduit bends

Third 90° bend =

A

Derate the design capacity by 15%

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23
Q

5–20 using three bends in conduit

Third bend may be acceptable =

(3)

A

* Not longer 33 feet

* conduit size increased

* Bend is 12 inches of cable feed end

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24
Q

5–21 conduit terminations

Protrude through structural floor =

A

1 inch to 4 inch

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25
Q

5–21 completing conduit installation

Complete conduit install =

(4)

A

* Clean

* reamed

* capped

* Labeled

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26
Q

5–21 complete conduit install

Equipped with pull cord =

A

200 lb test rating

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27
Q

5–23 points or pull boxes for conduits

Slip sleeve =

(2)

A

* Larger than the main conduit

* length 12 times the diameter

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28
Q

5–23 pull points or pull boxes for conduits

Gutter =

A

sheet metal housing or busduct

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29
Q

5-23

Using slip sleeves and gutters =

A

except used as splice locations

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30
Q

5-24 pull points and pull boxes

pulling and looping boxes only for cables =

A

> 2in OD

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31
Q

5–24 choosing pull box size

Q: If (5) 4” conduits are entering in one pull box, what is the required width?

A

15+8+8+8+8 = 47”

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32
Q

5–26 two general types of access floors

Standard height =

low-profile floors =

A

* 6 in or higher

* less than 6 in

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33
Q

5–26 access floor components

Access floor consist =

A

Except longitudinal cross-members (does not belong)

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34
Q

5–26 access floor components

Panel sizes =

A

18” to 24”

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35
Q

Figure 5.7

A

* space for tiles

* stringers

* aluminum locking pedestals

* steel footings

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36
Q

5-27 Freestanding and cornerlock systems

restricted installations =

A

finished heights 12in or less

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37
Q

5–28 design access floor

General office areas finished floor height =

A

8” or higher

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38
Q

5–28 design access floors

HVAC finished floor height =

A

12” or higher

39
Q

5–28 design access floors

Finished floors =

A

Min 2” of free space

40
Q

5-29 access floor building structure

Depressed slab =

A

New construction

41
Q

5–29 access floor building structure

Normal slab =

A

Renovated buildings

42
Q

5–30 floor panel coverings

Computer room =

A

High-pressure laminate

43
Q

5–30 floor panel coverings

Office =

A

Factory laminated

44
Q

5–31 load bearing capacity

Uniform load capacity =

A

100 lbf/ft²

45
Q

5–31 load bearing capacity

Concentrated load capacity =

A

2000 lbf

46
Q

5–31 load bearing capacity

General office =

A

50 lbf/ft²

47
Q

5–31 load bearing capacity

Dynamic loads =

A

Falling objects

48
Q

5-32 - running telecom cables

connecting hardware =

A

not be placed in access floor with the exception of CP

49
Q

5-32 Underfloor air distribution on cabling

Access floors maybe used as =

A

a plenum space for distributing conditioned air

50
Q

5–33 access floors

Disadvantages =

A

High initial cost

51
Q

5–35 ceiling distribution systems

Ceiling zone method =

A

904 ft.²

52
Q

5–38 design ceiling system

Min ceiling space =

(2)

A

* 3” above conduits

* 12” above tray or raceway

53
Q

5–40 pathway and cable support

Pathways must =

(2)

A

* Min of. 3” above ceiling tiles

* sufficient space then 6 inch above ceiling tiles

54
Q

5–40 pathway and cable support

J hooks distance =

100 feet run =

A

* 5ft apart

* 20 j-hooks

55
Q

5-41 pathway and cable support

50 or more cables =

A

cable tray

56
Q

5–42 cable tray fittings

Used for changing direction =

A

Except covers (does not belong)

57
Q

5–43 cable tray types

Ladder =

A

Two side rails

58
Q

5–43 cable tray types

Ventilated trough =

A

Ventilated bottom

59
Q

5–43 cable tray types

Ventilated channel =

A

Channel

60
Q

5–43 cable tray types

Solid bottom =

A

Solid bottom

61
Q

5–43 cable tray types

Spine =

A

Rigid spine

62
Q

5–43 cable tray types

Basket tray =

A

Wire mesh

63
Q

5–45 supporting cable trays

Trays and wire ways =

A

Supported on 5 feet centers

64
Q

5–46 ceiling homerun method conduit

One or two boxes =

A

Inside diameter of 1 inch

65
Q

5–46 ceiling homerun method conduit

Three boxes =

A

Inside diameter of 1.25 in

66
Q

5-46 zone conduit size

250 ft2 - 600 ft2 =

600 ft2 - 904 ft2 =

A

* 2 trade size conduit

* 2 1/2 trade size conduit

67
Q

5–50 attaching utility columns

Utility poles =

A

10ft, 12ft, 15ft

68
Q

5-52 other horizontal pathways

other types of pathways include =

(5)

A

* catenary wire (messenger)

*perimeter (surface) raceway

* overfloor ducts

* molding raceways

* poke-thru

69
Q

5-52 perimeter raceways

perimeter raceways =

(2)

A

* cubicle furniture

* power run seperate

70
Q

5–60 horizontal cabling system

Horizontal cabling installed =

(4)

A

* Star topology

* both ends terminated on same floor

* splices are not permitted, with the exception of fiber pigtails

* bridged taps not allowed

71
Q

5-60 topology

application specific-devices not used in horizontal cabling =

(3)

A

* baluns

* splitters

* crossover patch cords

72
Q

5–61

Centralize optical fiber cabling limited =

A

984 ft

73
Q

5–61 centralized optical fiber cabling

Pull through method limitation =

(Desktop)

A

295 ft

74
Q

5–61 centralize optical fiber cabling

Q: 1000 ft spool / 295 ft pull-through method =

A

3 pulls

75
Q

5-65 multidrop conduit system

Multidrop conduit system recommended =

A

buildings to preselected locations

76
Q

5–68 duct floor systems

Junction boxes =

A

60 ft

77
Q

5–69 duct system

Distribution ducts =

A

Distributing cables from the TR to specific floor areas

78
Q

5–70 duct systems

Feeder ducts =

A

Connects TR to distribution ducts

79
Q

5 – 70 duct system

Enclosed feeder j boxes =

A

5” handhold opening

80
Q

5–71 feeder duct types

Large lower =

A

Feeders

81
Q

5–71 feeder duct types

Standard Upper=

A

Power

82
Q

5-71 Feeder duct types

Large upper =

A

Telecommunications

83
Q

5–73 design underfloor ducts

Determining duct size =

A

1 in.² cross-section for each 100 ft.²

84
Q

5–73 design underfloor duct

Feeder duct size =

A

8.9 in.² cross-section for each 800 ft.²

85
Q

5–74 design underground duct

Distribution duct sizes =

(2)

A

* standard 3.3 in2 - 3.9 in.²

* use larger ducts when area is 60ft - 80ft long

86
Q

5–75 design underground duct

Slab thickness:

one level =

2 level =

Feeder beam concept =

A

* 5”

* 7”

* 7”

87
Q

5–80 terminating ducts

TR duct do not pass =

A

3 inch to 6 inch

88
Q

5–80 terminating ducts

TR duct pass =

A

Elbow

89
Q

5-93 Cellular Floor System

steel cellular floor =

A

do not use feeder (conduit to a cell) below deck

90
Q

5–102 trench duct for under floor

Trench duct cover plates =

A

4 feet long x up to 38” wide

91
Q

5–103 removing trench duct cover

Lifting device =

A

Stored in TR

92
Q

5–103 removing trench duct cover

Suction cups =

A

.25” eye bolts

93
Q

5-103 removing trench duct cover plates

building personnel =

A

should remove trench duct cover,

but telecom personnel is expecteted remove 1 or 2

94
Q

5–117 references

TIA-569-B =

A

Pathways and spaces

RCDD (24 decks)

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