(OLD) €h 5 - Horizontal Distribution System Flashcards by Ali Jeffery

5–1 horizontal pathway

Non continuous pathways =

J-hook

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5-1 horizontal pathways

Continuous pathways =
2

Conduit

* containment

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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

Standard floor space allocation =

100 ft.² of usable workspace

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5–9

BAS =
2

Building automation system

density

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5–9 BAS

BAS standard floor space coverage =

250 ft.²

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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

I TS 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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5–19 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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5–25 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 =

Busduct

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"

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

8" or higher

5–20 design access floors HVAC finished floor height =

12" or higher

5–28 design access floors Finished floors =

Min 2" of free space

5–29 load bearing capacity Uniform load capacity =

100 lbf/ft²

5–29 load bearing capacity Concentrated load capacity =

2000 lbf

5–29 load bearing capacity General office =

50 lbf/ft²

5–29 load bearing capacity Dynamic loads =

Falling objects

5-31 access floor building structure Depressed slab =

New construction

5–31 access floor building structure Normal slab =

Renovated buildings

5–32 floor panel coverings Computer room =

High-pressure laminate

5–32 floor panel coverings Office =

Factory laminated

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

5–42 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

5–50 attaching utility columns Utility poles =

10ft, 12ft, 15ft

5–60 horizontal cabling system Horizontal cabling installed =

Star topology

5–61 horizontal cabling system Centralize optical fiber cabling =

984 ft

5–61 centralized optical fiber cabling | Pull through method = Desktop

295 ft

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

3 pulls

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

571 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 =

3.9 in.², 80 feet 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

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

4 feet long, 38 inch width

5–103 removing trench duct cover Lifting device =

Stored in TR

5–103 removing trench duct cover Suction cups =

.25" eye bolts

5–117 references TIA-569-B =

Pathways and spaces