(OLD) €h 5 - Horizontal Distribution System Flashcards
5–1 horizontal pathway
Non continuous pathways =
J-hook
5-1 horizontal pathways
Continuous pathways =
2
- Conduit
* containment
5–7
Wet locations =
3
Sand
gravel
soil
5–9 considerations for horizontal pathways
Planning purposes =
Hallways
5–9 maximum occupant density
Standard floor space allocation =
100 ft.² of usable workspace
5–9
BAS =
2
Building automation system
density
5–9 BAS
BAS standard floor space coverage =
250 ft.²
5–10 cable diameter
4 pr cable =
.35in
5–10 cable diameter
2-fiber cable =
.18in
5-14 unsuitable conduit
Flexible conduit =
4
- Creep
- shift
- sheath damage
- not recommended
5–14 unsuitable conduit
If flexible conduit must be used =
Size increase by one trade size
5-14 acceptable conduit runs
I TS design =
Best direct route
5–14 acceptable conduit runs
Continuous section =
No longer than 100 feet
5–14 acceptable conduit runs
Pull boxes/pull points =
More than 100 feet
5–15 unacceptable conduit runs
Conduit should not be run =
Near heat sources
5–19 recommended conduit capacity
Cross-section area formula =
.785 x diameter²
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
5–19 been radii for conduits
4 pair cable =
4 times
5–19 bend radii
Multi-pair copper cable=
10 times
5–19 been radii
TBB cable=
8 times
5–25 design with conduit bends
If run requires (2) 90° bends =
Pull point
5–20 designs with conduit bends
Third 90° bend =
Derate the design capacity by 15%
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
5–21 conduit terminations
Protrude through structural floor =
1 inch to 4 inch
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
