\ Building automation system \ 250ft.2 \ pathway capacity - 1 cable each system

€h 05 - Horizontal Distribution System Flashcards by Ali Jeffery

5-1 horizontal pathways

Continuous pathways =

(2)

*Conduit

* containment

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5–1 horizontal pathway

Non continuous pathways =

J-hook

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5–7

Wet locations =

(3)

* Sand

* gravel

* soil

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5–9 considerations for horizontal pathways

Planning purposes =

Hallways

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5–9 maximum occupant density

Work area (WA) =

* 100 ft.²

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5–9

BAS =

(3)

* Building automation system

* 250ft.²

* pathway capacity - 1 cable each system

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5–10 cable diameter

4 pr cable =

.35in

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5–10 cable diameter

2-fiber cable =

.18in

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5-14 unsuitable conduit

Flexible conduit =

(4)

*Creep

* shift

* sheath damage

*not recommended

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5–14 unsuitable conduit

If flexible conduit must be used =

Size increase by one trade size

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5-14 acceptable conduit runs

ITS design =

Best direct route

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5–14 acceptable conduit runs

Continuous section =

No longer than 100 feet

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5–14 acceptable conduit runs

Pull boxes/pull points =

More than 100 feet

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5–15 unacceptable conduit runs

Conduit should not be run =

Near heat sources

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5-15 unacceptable conduit runs

Aluminum or ENT =

never be placed in concrete floors

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5–19 recommended conduit capacity

Cross-section area formula =

.785 x diameter²

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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

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5–19 been radii for conduits

4 pair cable =

4 times

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5–19 bend radii

Multi-pair copper cable=

10 times

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5–19 been radii

TBB cable=

8 times

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5–20 design with conduit bends

If run requires (2) 90° bends =

Pull point

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5–20 designs with conduit bends

Third 90° bend =

Derate the design capacity by 15%

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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

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5–21 conduit terminations

Protrude through structural floor =

1 inch to 4 inch

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5–21 completing conduit installation Complete conduit install = (4)

\* Clean \* reamed \* capped \* Labeled

5–21 complete conduit install Equipped with pull cord =

200 lb test rating

5–23 points or pull boxes for conduits Slip sleeve = (2)

\* Larger than the main conduit \* length 12 times the diameter

5–23 pull points or pull boxes for conduits Gutter =

sheet metal housing or busduct

5-23 Using slip sleeves and gutters =

except used as splice locations

5-24 pull points and pull boxes pulling and looping boxes only for cables =

\> 2in OD

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"

5–26 two general types of access floors Standard height = low-profile floors =

\* 6 in or higher \* less than 6 in

5–26 access floor components Access floor consist =

Except longitudinal cross-members (does not belong)

5–26 access floor components Panel sizes =

18" to 24"

Figure 5.7

## Footnote \* space for tiles \* stringers \* aluminum locking pedestals \* steel footings

5-27 Freestanding and cornerlock systems restricted installations =

finished heights 12in or less

5–28 design access floor General office areas finished floor height =

8" or higher

5–28 design access floors HVAC finished floor height =

12" or higher

5–28 design access floors Finished floors =

Min 2" of free space

5-29 access floor building structure Depressed slab =

New construction

5–29 access floor building structure Normal slab =

Renovated buildings

5–30 floor panel coverings Computer room =

High-pressure laminate

5–30 floor panel coverings Office =

Factory laminated

5–31 load bearing capacity Uniform load capacity =

100 lbf/ft²

5–31 load bearing capacity Concentrated load capacity =

2000 lbf

5–31 load bearing capacity General office =

50 lbf/ft²

5–31 load bearing capacity Dynamic loads =

Falling objects

5-32 - running telecom cables connecting hardware =

not be placed in access floor with the exception of CP

5-32 Underfloor air distribution on cabling Access floors maybe used as =

a plenum space for distributing conditioned air

5–33 access floors Disadvantages =

High initial cost

5–35 ceiling distribution systems Ceiling zone method =

904 ft.²

5–38 design ceiling system Min ceiling space = (2)

\* 3" above conduits \* 12" above tray or raceway

5–40 pathway and cable support Pathways must = (2)

\* Min of. 3" above ceiling tiles \* sufficient space then 6 inch above ceiling tiles

5–40 pathway and cable support J hooks distance = 100 feet run =

\* 5ft apart \* 20 j-hooks

5-41 pathway and cable support 50 or more cables =

cable tray

5–42 cable tray fittings Used for changing direction =

Except covers (does not belong)

5–43 cable tray types Ladder =

Two side rails

5–43 cable tray types Ventilated trough =

Ventilated bottom

5–43 cable tray types Ventilated channel =

Channel

5–43 cable tray types Solid bottom =

Solid bottom

5–43 cable tray types Spine =

Rigid spine

5–43 cable tray types Basket tray =

Wire mesh

5–45 supporting cable trays Trays and wire ways =

Supported on 5 feet centers

5–46 ceiling homerun method conduit One or two boxes =

Inside diameter of 1 inch

5–46 ceiling homerun method conduit Three boxes =

Inside diameter of 1.25 in

5-46 zone conduit size 250 ft² - 600 ft² = 600 ft2 - 904 ft² =

## Footnote \* 2 trade size conduit \* 2 1/2 trade size conduit

5–50 attaching utility columns Utility poles =

10ft, 12ft, 15ft

5-52 other horizontal pathways other types of pathways include = (5)

\* catenary wire (messenger) \*perimeter (surface) raceway \* overfloor ducts \* molding raceways \* poke-thru

5-52 perimeter raceways perimeter raceways = (2)

## Footnote \* cubicle furniture \* power run seperate

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

5-60 topology application specific-devices not used in horizontal cabling = (3)

## Footnote \* baluns \* splitters \* crossover patch cords

5–61 Centralize optical fiber cabling limited =

984 ft

5–61 centralized optical fiber cabling Pull through method limitation = (Desktop)

295 ft

5–61 centralize optical fiber cabling Q: 1000 ft spool / 295 ft pull-through method =

3 pulls

5-65 multidrop conduit system Multidrop conduit system recommended =

buildings to preselected locations

5–68 duct floor systems Junction boxes =

60 ft

5–69 duct system Distribution ducts =

Distributing cables from the TR to specific floor areas

5–70 duct systems Feeder ducts =

Connects TR to distribution ducts

5 – 70 duct system Enclosed feeder j boxes =

5" handhold opening

5–71 feeder duct types Large lower =

Feeders

5–71 feeder duct types Standard Upper=

Power

5-71 Feeder duct types Large upper =

Telecommunications

5–73 design underfloor ducts Determining duct size =

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

5–73 design underfloor duct Feeder duct size =

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

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

5–75 design underground duct Slab thickness: one level = 2 level = Feeder beam concept =

\* 5" \* 7" \* 7"

5–80 terminating ducts TR duct do not pass =

3 inch to 6 inch

5–80 terminating ducts TR duct pass =

Elbow

5-93 Cellular Floor System steel cellular floor =

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

5–102 trench duct for under floor Trench duct cover plates =

4 feet long x up to 38" wide

5–103 removing trench duct cover Lifting device =

Stored in TR

5–103 removing trench duct cover Suction cups =

.25" eye bolts

5-103 removing trench duct cover plates building personnel =

should remove trench duct cover, but telecom personnel is expecteted remove 1 or 2

5–117 references TIA-569-B =

Pathways and spaces