Ch. 5 * (Horizontal Distribution Systems) Flashcards
Usable floorspace includes ___
Hallways
Work area
100 sq’
BAS density
250 sq’
4 pair copper diameter
.35”
2-Fiber diameter
.18”
Flexible (unsuitable) conduit tends to ___
Creep
Shift
Cause sheath damage
Acceptable conduit runs
Direct route Parallel to bldg No single bend greater than 90° No more than 100 feet between pull boxes No more than 180° of bends between pull boxes
Unacceptable conduit runs
Should not be on top of cellular floor cells
Should not be run crosswise to cellular floor cells
Should not be run through flammable material storage areas
Should not be near heat sources
TBB
6 AWG
Ground bend rate
8X O.D.
Bend radius of multipair
10X O.D.
UTP bend radius
4X O.D.
Install a pull box if ___
More than (2) 90° bends Reverse bend between 100° and 180°
A completed conduit installation should be ___
Clean Reamed Capped Labeled Have a pull cord rated for 200lbs.
Slip sleeve
Larger than main conduit
Slip sleeve length
12 times the diameter of the largest conduit
Space requirements for (5) 4” conduits
47”
Access floor consists of ___
Footings Pedestals Stringers Modular floor panels Except "longitudinal crossmember"
Height of access (raised) floors
General office areas - 8”
Computer room - 12”
Depressed slab
New construction
Normal slab
Renovated building
Disadvantages of access (raised) floors
High initial cost
Load bearing capacity for access (raised) floors
Equipment room - 100lbs./sq’
General office - 50lbs./sq’
Low profile floor
Less than 6”
Ceiling zones
904 sq’
Ceiling space
3” above conduits
12” above tray or raceway
Access floor minimum requirements
2”
Cable support pathways should be installed ___
At least 3 inches above the ceiling tiles
J-hooks should be spaced
Every 5 feet
A 100 foot cable run should have ___ j-hooks
20
Cable tray fittings include:
Elbows Reducers Crossovers Tees Except "Cover"
Types of cable trays
Ladder - two side rails Ventilated trough - ventilated Ventilated channel - channel Solid bottom - solid Spine - spine Basket tray - wire mesh
Trays/Wireways should be supported ___
5’ on center
Ceiling home run conduit method
One or two boxes = 1”
Three boxes = 1.25”
Another name for power pole
Utility column or Utility pole
Utility pole sizes
10’
12’
15’
Centralized fiber
984’
Fiber to the desktop
Pull through method
1,000’ spool of fiber (pull through method)
3 pulls
Pull through method
295’ (90m)
J-Box
60’
Hand hole
5”
Large lower duct
Feeders (from electrical panels and TRs)
Standard upper ducts
Electrical power service
Large upper ducts
Telecommunications services
Duct sizing
1sq”/100sq’
Feeder beam slab thickness
7”
The duct elbow should extend __ AFF in TR
4”
Standard for spaces/pathways
569-B
Wet locations are considered ___
Slabs and direct contact with soil sand and gravel
Where do you store lifting devices for cover plates?
In the TR
Section cups
Eye bolts
Trench duct cover plates
4’ x 38”
TR duct in floor
Elbow into room
TR duct size
3-6”
Distribution duct size
3.9 sq”
Cross-sectional area of cable
.35 sq” x .785
Non-continuous pathway
J-hook
Continuous pathway
Conduit
Feeder duct size
8.9 sq”
Feeder ducts
Connect TR to distribution ducts
HVAC floor height
12”
Distribution duct
Floor
Load bearing for concentrated raised floor
2000 lb/ft
When using depressed slab for access flooring the depth should be ___
Equal to height of finished floor
Horizontal pathways do not include ___
Pull boxes
1.5” conduit can accommodate ___ .23” diameter cables
18
What is not always part of an access floor?
Stringer
Horizontal cabling runs may contain ___
One of the following:
TP, CP, HCP
Ventilated trough has ___
Side rails
How many 0.23” cables in a 4” conduit?
113
