Slide 1
LEARNING AND DEVELOPMENT PROGRAMSADARA ISOCYANATES PROJECT
(TDI/PMDI)
2015 SENDAN INTERNATIONAL COMPANY LIMITED
1
Never Stop Learning Because Life Never Stop TeachingCABLE
TRAY
What is Cable Tray Types of Cable TrayTypes of Material of Cable
trayInstallation Procedure of Cable Tray Support Procedure of Cable
tray Demonstration AREAS OF TRAINING
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingWhat is a
Cable Tray System?As per the National Electrical Code, a cable tray
system is "a unit or assembly of units or sections and associated
fittings forming a rigid structural system used to securely fasten
or support cables and raceways."
What does this mean? Cable trays support cable the way that
roadway bridges support traffic. A bridge is a structure that
provides safe passage for traffic across open spans. Cable tray is
the bridge that allows for safe transport of wires across open
spans. Therefore, think of cable tray as the structural component
of a building's electrical system.
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingWhat
standards / guidelines are available for cable tray systems? 1. The
National Electrical Code publishes the standards for all types of
electrical applications. Articles 318, 250, and 800 cover various
aspects of cable tray systems.2 NEMA, (National Electrical
Manufacturers Association), is an association comprised of the
major cable tray manufacturers in the industry. This committee has
published three documents to date: NEMA VE1, FG1 and VE2. NEMA VE1
Covers general cable tray definitions, manufacturing standards,
performance standards, test standards, and application information.
NEMA FG1 Addresses the standards for fiberglass cable tray
systems.NEMA VE2 Covers cable tray installation guideline which
covers receiving and unloading material, storage of material, and
general installation practices
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
What types of Cable Tray are available? Ladder Tray Solid Bottom
Cable Tray Trough ( ventilated ) Cable Tray Channel ( perforated
)Cable Tray Wire Mesh Cable Tray Single Rail Cable Tray
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching1. Ladder
Cable Tray: 1.1. Solid side rail protection and system strength
with smooth radius fittings and a wide selection of materials and
finishes. 1.2 maximum strength for long span applicationsstandard
widths of 150, 300, 450, 600, 750, and 900 millimeters 1.3 standard
depths of 50, 75, 100, 125 and 150 millimeters 1.4standard lengths
of 3 to 6 meters 1.5rung spacing of 150, 225, 300, and 450
millimeters 1.6Ladder cable tray is generally used in applications
with intermediate to long support spans, 3meters to 6 meters.
Figure 1-1 I-BeamFigure 1-2 Channel Flange In Figure 1-2 Channel
Flange Out
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching2. Solid
Bottom Cable Tray: 2.1. Non ventilated continuous support for
delicate cables with added cable protection available in metallic
and fiberglass. 2.2. Solid bottom metallic with solid metal covers
for non plenum rated cable in environmental air areas 2.3.standard
widths of 150, 300, 450, 600, 750, and 900 millimeters 2.4.
standard depths of 75, 100, 125, and 150 inches 2.5. standard
lengths of 3, 6, meters Solid Bottom cable tray is generally used
for minimal heat generatingElectrical or telecommunication
applications with short to intermediatesupport spans of 1.5 meter
to 3 meter.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
Figure 2-1 Pan Flange In Figure 1-2 Pan Flange Out Figure 2-3
Corrugated Bottom Figure 2-4 Solid Sheet on Top ofLadder Rung
Example of Solid Bottom Cable Tray
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching3. Trough
Cable Tray: 3.1. Moderate ventilation with added cable support
frequency and with the bottom configuration providing cable support
every 4 inches. Available in metal and nonmetallic materials. 3.2.
standard widths of 150, 300, 450, 600, 750, 900 millimeters3.3.
standard depths of 75, 100, 125, and 150 millimeters 3.4. standard
lengths of , 3000, 6000 millimeters 3.5. fixed rung spacing of 100
millimeters on center Trough cable tray is generally used for
moderate heat generating applications with short to intermediate
support spans of 0.6, 3, 6 meters.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
Figure 3-1 Corrugated Bottom with Holes Figure 3-2 Pan with
Louvers Figure 3-3 Tray with Close Rung Spacing
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching4. Channel
Cable Tray: 4.1 an economical support for cable drops and branch
cable runs from the backbone cable tray system. 4.2. standard
widths of 75, 100, and 150 millimeters in metal systems and up to
200 millimeters in nonmetallic systems. 4.3. standard depths of 30
to 50 millimeters in metal systems and 25, 30, 40, and 50
millimeters in nonmetallic systems 4.4. standard length of 3, 4,
and 6 meters Channel cable tray is used for installations with
limited numbers of traycable when conduit is undesirable. Support
frequency with short to mediumsupport spans of 1.5 to 3 meters.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
Figure 4-Ventilated Bottom Figure 5- 2 Solid Bottom
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching5. Wire Mesh
Cable Tray: 5.1. A job site, field adaptable support system
primarily for low voltage, telecommunication and fiber optic
cables. These systems are typically steel wire mesh, zinc plated.
5.2. standard widths of 25, 50, 150, 200, 300, 400, 450, 500, and
600 millimeters 5.3. standard depths of 25, 50, and 100 millimeters
5.4. standard length of about 3 meter Wire Mesh tray is generally
used for telecommunication and fiber opticapplications and are
installed on short support spans, 1.2 to 2.4 meter.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
Figure 5-1 Wire Mesh Cable Tray Example of Wire Mesh Cable
Tray
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching6. Single
Rail Cable Tray: 6.1. These aluminum systems are the fastest
systems to install and provide the maximum freedom fort cable to
enter and exit the system. 6.2. Single hung or wall mounted systems
in single or multiple tiers. Standard widths are 6, 9, 12, 18, and
24 inches. 6.3. Standard depths are 3, 4, and 6 inches. 6.4.
Standard lengths are 10 and 12 feet. Single Rail Cable Tray is
generally used for low voltage and power cablesinstallations where
maximum cable freedom, side fill, and speed to installare
factors.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching Example of
Wire Mesh Cable Tray
Figure 6.1 Centre Rail Cable Tray Figure 6.2 Single Tier Wall
Mount Figure 6.3 Multi Tier Wall Mount
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingWhat
materials available for the various cable tray systems? 1. Steel
(Min. Yield = 33KSI) (35 KSI for Stainless) 1.1. Plain: hot rolled
pickled and oiled steel.1.2.Pre-Galvanized: mill galvanized
steel1.3.Hot Dip Galvanized After Fabrication1.4. Stainless Steel:
type 304 or 316L fully annealed stainless steel 2. Aluminum
(Min.Yield = 23 KSI) 2.1. 6063-T6 or 5052-H32 alloy per ASTM B209
3. Fiber Reinforced Plastic (FRP) 3.1. Polyester and Vinyl Ester
resin systems available 3.2. Meet ASTM E-84 smoke density rating;
Polyester 680, Vinyl Ester1025
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingWhat
configurations are available? 1.Straight sections are available to
route cables in a horizontal or vertical plane. 2. Fittings are
available to route cables in various directions in either the
horizontal or vertical planes. Typical examples of fittings include
elbows, tees, crosses, and risers. Each of these fittings are
available in various radii and bend angles. 3. Covers are
accessories and shouldn't be in here unless splices etc.
areincluded.
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingBREAK
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingCable Tray
Installation Step
Common Tools for Cable Tray installation Marking of Cable Tray
Cutting & Fabrication of Cable Tray Drilling of Cable Tray
Support Installation for Cable Tray Cable Tray Fitting &
Accessories Fixing of Cable Tray
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingCommon Tools
for Installation The following tools are commonly used for
installation of cable tray:
1. Metal cutting saw2. Touch-up material3. Screwdriver3. Drill
with bits4. File5.Open-end wrench6. Nylon cord or laser7. Sealant
for cut edges(fiberglass)8. Cutting saw (for fiberglass), carbide-
or diamond-tipped 9. Leveling device10. Tape measure11. Square12. C
clamp13. Torque wrench14. Ratchet wrench15 Offset bolt cutters
(wire mesh)16 Dust mask (fiberglass)17 Appropriate safety
equipment
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching Marking of
Cable Tray
Using a square that reaches across the width of the cable tray,
gauge off the edge of one side rail and mark both flanges.Mark the
web of the rail. Marking can be done with a scribe, marking pen, or
a pencil.
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingCutting
& Fabrication of Cable Tray
The cutting can be made using a hand-held hack saw, a circular
saw with carbide-tip or diamond-dusted blade, a hand-held band saw,
offset bolt cutters, or a high-speed grinder (for wire mesh only).
It isimportant to get a square cut to ensure a good splice
connection. Cable tray manufacturers offer jigs and other devices
to aid in field cutting. After cutting, smooth the cut edges to
remove any burrs. Fiberglass material should be cut with a circular
saw with a carbide tip or a diamond dusted blade.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
Cable Tray Bends & Offset Fabrication Tables
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching Cutting
with Hand-Held Hack Saw Cutting with Bolt Cuttersexamples of Cable
Tray Cutting
Channel Tray cutting
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingDrilling
Holes for splice plates must be drilled in field-cut cable trays.
The most common method of locating the hole positions is to use a
splice plate as a template.Drill jigs are also available. A short
piece of side rail that is punched with the standard factory hole
pattern can be bolted to the splice plate to serve as a stop that
rests against the end of the field-cut side rail Clamp the splice
plate to the rail, and drill through the splice plate holes and the
side rail . The correct drill size depends on the hardware supplied
with the cable tray. Match the holes that exist in the cable
tray.After drilling, remove burrs.
Drilling with Drill Jigs Drilling with Punched Side Rail
Drilling with Clamp and Side Rail
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingCable Tray
Supports.1. Trapeze Support (Single or Multi-tier) 2. Hanger rod
clamps, "J" hangers 3. Center Hung Support 4. Wall Support 5. Under
floor Support 6.Single Channel Cable Tray Hanger 7. Double Channel
Cable Tray Hanger
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching1. Trapeze
Type
1.1. Thread nuts onto threaded rod approximately 50 mm (2 in)
above the desired location for the bottomof the cable tray.1.2.
Slide on square washers followed by cross member and second set of
square washers.1.3.Thread the second set of nuts onto the threaded
rod.1.4. Move the cross member so that the top surface is located
where the bottom of the cable tray run willbe located.1.5. Move the
second set of nuts up the threaded rod until the cross member is
reached and held in place.1.6. Make sure the cross member is level,
then move the first set of nuts down the threaded rod until the
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
Figure 1-1 Strut Support
Figure 1-2 Angle Iron Support
Figure 1.3 C-Channel Support
Figure 1.4 Strut (Exploded View)examples of Trapeze Type
Supports
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching2. Hanger
Rod Clamp
2.1. Thread nuts onto threaded rod approximately 225 mm (9 in)
above the desired location for the bottom of the cable tray.2.2.
Place a clamp around the side rail of the cable tray.2.3. Lift the
entire cable tray section onto the threaded rod, running the
threaded rod through the holes in the clamps.2.4. Thread a second
set of nuts onto threaded rod, moving them up until the bottom of
the cable tray reaches the desired location.2.5. Move the first set
of nuts down the threaded rod and secure clamps in place.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching examples of
Hanger Rod Clamp Supports
2.1. Single Cable Tray Hanger 2.3. Double Cable Tray Hanger1.2
Single Cable Tray Hanger 1.4. Double Cable Tray Hanger
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching 3. Center
Hung Support 3.1.Thread nut onto threaded rod approximately 225 mm
(9 in) above the desired location for the bottom of the cable
tray.3.2. Slide washer and support onto the threaded rod with
upright tube going through the center of the cable tray section
needing support.3.3. Place a square washer on the threaded rod and
thread on the second nut.3.4. Move cross member so its top surface
is located at the place where the bottom 3.5. the cable tray run
will be located.3.6. Move the second nut up the threaded rod until
it reaches the cross member and holds it in place.3.7. Move the
first nut down the threaded rod until it secures the cross member
in place. In most cases, hold-down/guide clamps may be mounted on
either the inside or outside of the cable tray.When installed on
the inside of the cable tray, the clamp and/or attaching hardware
should not extend into the cable pathway.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
Figure 3.1 Center Hangar Support Figure 3.2 Center Hangar
Support Exemple of 3.1 Center Hangar Support
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching4. Wall and
Cantilever Brackets
Secure the brackets to the structure or wall making sure they
are level and aligned with each other. .
Figure 4-1 Single Strut Cantilever BracketFigure 4-2 Gusset
Cantilever Bracket
Figure 4-4 Single-Rail Direct Wall MountFigure 4-3 Fiberglass
Cantilever Bracket 0
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching5. Floor and
Roof Installations
5.1. Cable tray should not be laid directly on the floor or
roof. 5.2. It should be mounted far enough off the floor or roof to
allow the cables to exit through the bottom of the cable tray.5.3.
If a strut is used for this purpose, mount the strut directly to
the floor or roof and attach the cable tray to the strut using
hold-down clamps and/or guide clamps.
figure 5-2 Under floor Support Attached toFloor Pedestals Figure
5-1 Under Floor Strut-Type Support
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching 6. Single
& Double Channel Cable Tray Hanger
6.1. Thread nut onto threaded rod to the height required.6.2.
Place hanger on the threaded rod and follow with one nut.6.3. Run
nut up the threaded rod until the bottom of the hanger is at the
desired height6.4. Run top nut down to tighten. 6.5. Place channel
on the hanger, and secure in place as necessary.
Figure 6-1 Single Channel Hanger
Figure 6-2 Double Channel Hangar
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching CABLE TRAY
FITTINGS & ACCESSORIES INSTALLATION
Horizontal Elbow Support Supports for horizontal cable tray
fittings should be placed within 600 mm (2 ft) of each fitting
extremity, and as follows: 90 supports at the 45 point of arc. 60
supports at the 30 point of arc. 45 supports at the 22-1/2 point of
arc (except for the 300 mm (12 in) radii). 30 supports at the 15
point of arc (except for the 300 mm (12 in) radii).
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching Horizontal
Tee Support
Place horizontal tee supports within 600 mm (2 ft) of each of
the threeopenings connected to other cable tray items for the 300
mm (12 in) radius. On all other radii, at least one additional
support should be placed under each side rail at the horizontal
tee, preferably as shown.
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingHorizontal
Cross Support Place horizontal cross support within 600 mm (2 ft)
of each of the fouropenings connected to other cable tray items for
the 300 mm (12 in) radius. On all other radii, at least
oneadditional support should be placed under each side rail of the
horizontal cross, preferably as shown.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching Reducer
Support Place reducer supports within 600 mm (2 ft) of each fitting
extremity.
3.5.1.6 Vertical Cable Tray Elbows Vertical cable tray elbows at
the top of runs should be supported at end. At the bottom of runs,
they should be supported at the top of the elbow and within 600
mm(2 ft) of the lower extremity of the elbows.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching Vertical
Cable Tray Tees Vertical cable tray tees should be supported within
600 mm (2 ft) of each fitting extremity.
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
Fixing of Cable Tray
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
Expansion Splice Plate Attachment Splice Plate Attachment
Straight Cable Tray Installation Straight Cable Tray
Installation
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
CABLE TRAY
Never Stop Learning Because Life Never Stop Teaching
CABLE TRAY
Never Stop Learning Because Life Never Stop TeachingTHANK
YOU
