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Flashcards in €h 05 - Horizontal Distribution System Deck (94):
1

5-1 horizontal pathways

Continuous pathways =

(2)

 

*Conduit

* containment

2

5–1 horizontal pathway

Non continuous pathways =

 

J-hook

3

5–7

Wet locations =

(3)

 

* Sand

* gravel

* soil

4

5–9 considerations for horizontal pathways

Planning purposes =

 

Hallways

5

5–9 maximum occupant density

Work area (WA) =

 

* 100 ft.²

6

5–9

BAS =

(3)

 

* Building automation system

* 250ft.2

* pathway capacity - 1 cable each system

7

5–10 cable diameter

4 pr cable =

 

.35in

8

5–10 cable diameter

2-fiber cable =

 

.18in

9

5-14 unsuitable conduit

Flexible conduit =

(4)

 

*Creep

* shift

* sheath damage

*not recommended

10

5–14 unsuitable conduit

If flexible conduit must be used =

 

Size increase by one trade size

11

5-14 acceptable conduit runs

ITS design =

 

Best direct route

12

5–14 acceptable conduit runs

Continuous section =

 

No longer than 100 feet

13

5–14 acceptable conduit runs

Pull boxes/pull points =

 

More than 100 feet

14

5–15 unacceptable conduit runs

Conduit should not be run =

 

Near heat sources

15

5-15 unacceptable conduit runs

Aluminum or ENT =

 

never be placed in concrete floors

16

5–19 recommended conduit capacity

Cross-section area formula =

 

.785 x diameter²

17

5–19 recommended conduit capacity

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

 

.785 x (.35)² = .0962

18

5–19 been radii for conduits

4 pair cable =

 

4 times

19

5–19 bend radii

Multi-pair copper cable=

 

10 times

20

5–19 been radii

TBB cable=

 

8 times

21

5–20 design with conduit bends

If run requires (2) 90° bends =

 

Pull point

22

5–20 designs with conduit bends

Third 90° bend =

 

Derate the design capacity by 15%

23

5–20 using three bends in conduit

Third bend may be acceptable =

(3)

 

* Not longer 33 feet

* conduit size increased

* Bend is 12 inches of cable feed end

24

5–21 conduit terminations

Protrude through structural floor =

 

1 inch to 4 inch

25

5–21 completing conduit installation

Complete conduit install =

(4)

 

* Clean

reamed

* capped

* Labeled

26

5–21 complete conduit install

Equipped with pull cord =

 

200 lb test rating

27

5–23 points or pull boxes for conduits

Slip sleeve =

(2)

 

* Larger than the main conduit

* length 12 times the diameter

28

5–23 pull points or pull boxes for conduits

Gutter =

 

sheet metal housing or busduct

29

5-23

Using slip sleeves and gutters = 

 

 

except used as splice locations

30

5-24 pull points and pull boxes

pulling and looping boxes only for cables = 

 

> 2in OD

31

5–24 choosing pull box size

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

 

15+8+8+8+8 = 47"

32

5–26 two general types of access floors

Standard height =

low-profile floors =

 

* 6 in or higher

* less than 6 in

33

5–26 access floor components

Access floor consist =

 

Except longitudinal cross-members (does not belong)

34

5–26 access floor components

Panel sizes =

 

18" to 24"

35

Figure 5.7

 

Q image thumb

 

* space for tiles

* stringers

* aluminum locking pedestals

* steel footings

36

5-27 Freestanding and cornerlock systems

restricted installations = 

 

finished heights 12in or less

37

5–28 design access floor

General office areas finished floor height =

 

8" or higher

38

5–28 design access floors

HVAC finished floor height =

 

12" or higher

39

5–28 design access floors

Finished floors =

 

Min 2" of free space

40

5-29 access floor building structure

Depressed slab =

 

New construction

41

5–29 access floor building structure

Normal slab =

 

Renovated buildings

42

5–30 floor panel coverings

Computer room =

 

High-pressure laminate

43

5–30 floor panel coverings

Office =

 

Factory laminated

44

5–31 load bearing capacity

Uniform load capacity =

 

100 lbf/ft²

45

5–31 load bearing capacity

Concentrated load capacity =

 

2000 lbf

46

5–31 load bearing capacity

General office =

 

50 lbf/ft²

47

5–31 load bearing capacity

Dynamic loads =

 

Falling objects

48

5-32 - running telecom cables

connecting hardware =

 

not be placed in access floor with the exception of CP

49

5-32 Underfloor air distribution on cabling

 

Access floors maybe used as =

 

a plenum space for distributing conditioned air

50

5–33 access floors

Disadvantages =

High initial cost

51

5–35 ceiling distribution systems

Ceiling zone method =

904 ft.²

52

5–38 design ceiling system

Min ceiling space =

(2)

 

* 3" above conduits

* 12" above tray or raceway

53

5–40 pathway and cable support

Pathways must =

(2)

 

* Min of. 3" above ceiling tiles

* sufficient space then 6 inch above ceiling tiles

54

5–40 pathway and cable support

J hooks distance =

100 feet run =

 

* 5ft apart

* 20 j-hooks

55

5-41 pathway and cable support

50 or more cables = 

 

cable tray

56

5–42 cable tray fittings

Used for changing direction =

 

Except covers (does not belong)

57

5–43 cable tray types

Ladder =

 

Two side rails

58

5–43 cable tray types

Ventilated trough =

 

Ventilated bottom

59

5–43 cable tray types

Ventilated channel =

 

Channel

60

5–43 cable tray types

Solid bottom =

 

Solid bottom

61

5–43 cable tray types

Spine =

 

Rigid spine

62

5–43 cable tray types

Basket tray =

 

Wire mesh

63

5–45 supporting cable trays

Trays and wire ways =

 

Supported on 5 feet centers

64

5–46 ceiling homerun method conduit

One or two boxes =

 

Inside diameter of 1 inch

65

5–46 ceiling homerun method conduit

Three boxes =

 

Inside diameter of 1.25 in

66

5-46 zone conduit size

250 ft2 - 600 ft2 = 

600 ft2 - 904 ft2 =

 

* 2 trade size conduit

* 2 1/2 trade size conduit

67

5–50 attaching utility columns

Utility poles =

 

10ft, 12ft, 15ft

68

5-52 other horizontal pathways

other types of pathways include = 

(5)

* catenary wire (messenger)

*perimeter (surface) raceway

* overfloor ducts

* molding raceways

* poke-thru

69

5-52 perimeter raceways

perimeter raceways = 

(2)

 

 

* cubicle furniture

* power run seperate

 

70

5–60 horizontal cabling system

Horizontal cabling installed =

(4)

 

* Star topology

* both ends terminated on same floor

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

* bridged taps not allowed

71

5-60 topology

application specific-devices not used in horizontal cabling = 

(3)

 

* baluns

* splitters

* crossover patch cords

72

5–61 

Centralize optical fiber cabling limited =

 

984 ft

73

5–61 centralized optical fiber cabling

Pull through method limitation =

(Desktop)

 

295 ft

74

5–61 centralize optical fiber cabling

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

 

3 pulls

75

5-65 multidrop conduit system

Multidrop conduit system recommended = 

 

buildings to preselected locations

76

5–68 duct floor systems

Junction boxes =

 

60 ft

77

5–69 duct system

Distribution ducts =

 

Distributing cables from the TR to specific floor areas

78

5–70 duct systems

Feeder ducts =

 

Connects TR to distribution ducts

79

5 – 70 duct system

Enclosed feeder j boxes =

 

5" handhold opening

80

5–71 feeder duct types

Large lower =

 

Feeders

81

5–71 feeder duct types

Standard Upper=

 

Power

82

5-71 Feeder duct types

Large upper =

 

Telecommunications

 

83

5–73 design underfloor ducts

Determining duct size =

 

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

84

5–73 design underfloor duct

Feeder duct size =

 

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

85

5–74 design underground duct

Distribution duct sizes =

(2)

 

* standard 3.3 in2 - 3.9 in.²

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

86

5–75 design underground duct

Slab thickness:

one level =

2 level =

Feeder beam concept =

 

* 5"

* 7"

* 7"

87

5–80 terminating ducts

TR duct do not pass =

 

3 inch to 6 inch

88

5–80 terminating ducts

TR duct pass =

 

Elbow

89

5-93 Cellular Floor System

steel cellular floor  =

 

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

90

5–102 trench duct for under floor

Trench duct cover plates =

 

4 feet long x up to 38" wide

91

5–103 removing trench duct cover

Lifting device =

Stored in TR

92

5–103 removing trench duct cover

Suction cups =

.25" eye bolts

93

5-103 removing trench duct cover plates

building personnel = 

 

should remove trench duct cover,

but telecom personnel is expecteted remove 1 or 2

94

5–117 references

TIA-569-B =

Pathways and spaces