GRP/FRP Cable Management Systems + Cable trays + Cable ladders + Trunking & accessories www.arcinsulations.com Works: Village: Ramdevpur, P.O.: Bawali P.S.: Bishnupur, Dist.: 24 Pgs(S) West Bengal, India Tel: +91 33 2495 4231 Fax: +91 33 2495 4233 E-mail: [email protected]Correspondence: Flat 25B, Tower - A South City 375, Prince Anwar Shah Road Kolkata - 700 064 West Bengal, India Mobile: +91 9830433678, 9748708809 Designed by: Techno Vision, Calcutta, India. | [email protected]
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+ Cable trays + Cable ladders + Trunking & accessories ... Trays.pdfGRP/FRP Cable Management Systems Uncompromised Insulation Quality The growing use of composites as an alternative
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The growing use of composites as an alternative to traditional materials such as steel, aluminium, etc, is basically due to the specific characteristics of the composite, such as:
• The unique resistance to corrosion contributes to reduce the life cycle costs of the composite installation.
• A specific mechanical strength is higher at lower weight, in comparison to conventional materials of construction.
• Easy & quick installation.
• High electrical Insulation properties.
Above all durability & resistance to corrosion lead to lower costs during the life of installation.
The ARCFRP Cable trays are designed & manufactured to provide a stable & dependable cable support in highly corrosive applications. From power plants to fertilizer industries, paper mills to refineries & laboratories, sound electrical design requires an adaptable cable support system that is reliable. The ARCFRP Cable trays provide a solution for cabling networks that must be upgraded, reconfigured or relocated, The variety and sophistication of overhead distribution systems offer greater choice in selecting the right cable tray for new construction and retrofit applications. Whether concealed in suspended ceilings or installed in open overhead spaces, cable trays offer a high degree of flexibility, both in terms of locating the components and accessing the cabling contained within them. The ARCCable Support Systems possess unique properties which enable them to resist many corrosive environments, particularly where conditions indicate that conventional materials will not provide art economic service life.
Constructed from glass reinforced thermoset Isopthalic resins, ARCCable Support Systems are designed and manufactured with a structural integrity normally only associated with steel and aluminum, but without their corrosion, weight and electrical conductivity problems.
The ARC profiles art designed and manufactured as structural components. Hence, it is essential to control the position and orientation of the glassfibre reinforcement in longitudinal and transverse direction to maintain their structural integrity. Additionally the presence of surface veil causes a resin (Isopthalic) rich barrier layer which enhances the degree of corrosion resistance. UV stabilizers & Fire retardants are added to enhance the properties.
All cable support system components are manufactured using Isophthalic polyester fire retardant resin systems that enable compliance to a flame spread rating of less than 25 for ASTM E-84 and a self extinguishing rating under ASTM D 635. Cable trays are constructed from high strength pultruded channel profile. Tray can be provided plain or perforated to provide cable fastening and/or ventilation. All fitting, horizontal bends, risers, reducers, tees. etc. used to enable cable routings to deviate from a straight line onto another plane, are constructed from the same profiles as the straight ladder sections. Standard joining of cable ladder or tray sections and fittings, is accomplished via FRP splice plates and stainless steel fasteners. Fibreglass joining accessories are also available for systems requiring total insulating properties. Straight sections and fittings can be pre-drilled to accept joining accessories, if desired. Cut edges and drilled holes are all sealed at manufacture.
The Pultrusion process used to manufacture the profiles achieves the optimum combination of these parameters.
All ARC Cable Tray Systems (CTS) are designed using high strength to weight ratio pultruded structural composite profiles. The ARC CTS are manufactured as per:
• Full Ventilation - Power cables need not be derated in a ventilated cable tray system. Explosive gases cannot be trapped or transmitted as in totally enclosed wiring systems.
• Long Support Spans- ARC Cable Tray Systems are designed for up to 3mtr support spans, longer than most other wiring methods. Fewer supports reduce both installation time and cost.
• Corrosion Resistance - The inherent chemical resistance makes it desirable for severely corrosive environments. Life cycle costs of ARC cable tray installations can be dramatically reduced by the extended life expectancy of this product.
• Transparent to RF transmission - Fibreglass composites do not cause electromagnetic interference and are transparent to radio frequency transmissions. ARC Cable Support Systems provide a solution in applications where clarity of communication transmissions is paramount.
• Non Conductive and Non Magnetic - As ARC cable ladder and tray is non conductive, there is no concern of transmitting electricity into the support system from damaged cables. Additionally, there is no requirement for special support conditions to prevent electrolytic corrosion. Non conductive and non magnetic features mean a safer support system.
• Lightweight and Manageable - Pultruded fibreglass profiles used in ARC Cable Support Systems have a specific gravity of one-fourth that of steel and two-thirds that of aluminum, allowing for considerably simplified erection and handling. Unlike stainless steel, ARC Cable Support Systems can be easily cut and drilled on site using only hand tools.
• High Strength to Weight Ratio - ARC Cable Support Systems have a superior strength to weight ratio compared to steel or aluminum whilst maintaining a similar structural integrity. The Pultrusion process utilised in manufacture, results in high glass content and consistent reinforcement location. These are critical for consistent performance and achievement of the necessary physical properties.
GRP/FRP Cable Management Systems
• Cable Loads - The cable load is simply the total weight of all the cables to be placed in the tray. This load should be expressed in Kg / mtr.
• Concentrated Loads - A concentrated static load represents a static weight applied between the side rails. Tap boxes, conduit attachments and long cable drops are just some of the many types of concentrated loads. When so specified, these concentrated static loads may be converted to an equivalent, uniform load (We) in kilograms per linear meter by using the following formula:
We= 2 x concentrated static load
Span length (mtrs)
• Wind Loads - Wind loads need to be determined for all outdoor cable tray installations.
• Ice Loads - Glaze ice is the most commonly seen form of ice build-up. It is the result of rain or drizzle freezing on impact with an exposed object.
• Snow Loads - Snow is measured by density and thickness. The density of snow varies almost as much as its thickness.
• Seismic Loads - The cable tray/strut support system exhibit more seismic capacity than originally expected.
• Splices - A lot of attention has been given to the strength of the side rails. These load bearing side rails must be spliced to form a continuous system, therefore the design of the splice plate is very important.
• Simple Beam - A good example of simple beam is a single straight section of cable tray supported but not fastened at either end. When the tray is loaded the cable tray is allowed to deflect.
• Continuous Beam - Continuous beam is the beam configuration most commonly used in cable tray installations. An example of this configuration is where cable trays are installed across several supports to form a number of spans. The continuous beam possesses traits of both the simple and fixed beams.
• Cantilever Beam - A cantilever beam configuration occurs when one end of the beam is rigidly attached to the support and the other end is unsupported. This type of configuration is typically used when wall mounting a bracket to support cable tray. Since one end is unsupported.
• Fixed Beam - A fixed beam configuration has both ends of the beam rigidly attached to the supports. A good example of a fixed beam is the rung of a cable tray. By attaching the ends of the rung to the side rails, the ends are not free to move, bend or twist.
Structural Character ist ics of
Cable Tray and SupportsASTM standards define physical properties tests for the materials used to pultrude the cable tray. The specific ASTM test methods for mechanical, thermal and flammability properties are identified below. ASTM standard material properties for fiberglass channel and strut are identical to those of the cable tray because they are pultruded from the same materials.
Properties Test Method Unit / Value Longitudinal Transverse
Tensile Strength ASTM D638 MPa 207.0 48.0
Tensile Modulus ASTM D638 MPa x 104 1.724 0.552
Flexural Strength ASTM D790 MPa 207 69
Flexural Modulus ASTM D790 MPa x 104 1.10 0.552
Izod Impact ASTM D256 kJ/m 1.495 214.0
Compressive Strength ASTM D695 MPa 207.0 103.4
Compressive Modulus ASTM D695 MPa x 104 1.724 0.690
BARCol Hardness ASTM D2583 -- 45.0 45.0
Shear Strength ASTM D732 MPa 38 38.0
Density ASTM D1505 Kg/m3 1605 - 1716.0 -
Coefficient of Thermal Expansion ASTM D696 cm/cm/°F 5 x 10-6 -
Water Absorption ASTM D570 Max % 0.5 -
Dielectric Strength ASTM D149 kV/mm 8.0 -
Flammability Classification UL94 VO - -
Flame Spread ASTM E-84 25 max - -
Tests and Standards for the
Pu l t ruded Prof i les
GRP/FRP Cable Management Systems
Section 4 of NEMA FG 1 provides the performance standards and class designations, for fiberglass cable tray systems. Based on a twenty foot support span, three working load classifications are recognized:
Load Class Allowable Working Load (Kg / mtr)
A 74.4
B 111.6
C 148.8
The following Load / Span Class designations are applicable
Working Load Support Span NEMA Class Kg / mtr. mtr Designation
Note: 1) In all ladder type trays 90 kg concentric load will be kept after putting above written UDL, without breaking or developing cracks. 2) In perforated type trays no concentric load will be allowed.
It is important that thermal contraction and expansion be considered when installing cable tray systems. The length of the straight cable tray runs and the temperature differential govern the number of expansion splice plates required. The cable tray should be anchored at the support nearest to its midpoint between the expansion splice plates and secured by expansion guides at all other support locations. The cable tray should be permitted longitudinal movement in both directions from that fixed point.
Accurate gap settings at the time of installation are necessary for the proper operation of the expansion splice plates. The following procedure should assist the installer in determining the correct gap:
• Plot the highest expected tray temperature on the maximum temperature line.
• Plot the lowest expected tray temperature on the minimum temperature line.
• Draw a line between the maximum and minimum points.
• Plot the tray temperature at the time of installation to determine the gap setting.
ThermalContract ion and Expansion
Load Standards
X
X
X
X
X
X
Expansion Splice Plates
Typical Cable Tray Installation
Tray
Tem
perature
At Time
of Ins
tallatio
n
MaximumTemperature
MinimumTemperature
(3.2) (6.3) (9.5) (12.7)
(15.9)(0.0)
1/8 1/4 3/8 1/2
5/8
50
40
30
20
10
0
-10
-20
-30
-40
50
40
30
20
10
0
-10
-20
-30
-40
130
110
90
70
50
30
10
-10
-30
130
110
90
70
50
30
10
-10
-30
FºFº CºCº
1
3
2
4
0
GAP SETTING
Inches (mm)
100 mm C-Channelwith 4 mm thickness
100 mm C-Channelwith 6 mm thickness
GRP/FRP Cable Management Systems
• The installation of ARCCable Tray should be made in compliance with the standards set forth by the NEMA Publications FG-1 (current issue).
• Always observe common safety practices when assembling tray and fittings in the field. Assemble in well-ventilated areas as dust from field cuts can accumulate. This presents no serious health hazard but can cause skin irritation and, if allowed to accumulate with grease and other machining lubricants, can become abrasive. Personnel should wear safety goggles, dust mask, coveralls or a shop coat when sawing, machining and/or sanding.
• Avoid generating excessive heat in any machining operation, as heat softens the bonding resin in the fiberglass, resulting in a ragged rather than a clean-cut edge.
• Avoid excessive pressure when sawing, drilling, and routing, etc. Use carbide-tipped drill bits and saw blades for extended tool life.
• The use of lubricant during machining is not recommended.• To avoid chipping of material at cut edges, secure cable tray and fittings properly during field cutting operations.• We recommend the use of compatible sealant for sealing surfaces and cut edges after field cuts are made.
Supports must be located so that connectors (splice joints) between horizontal runs fail between the support point and the quarter point of the span. Standard engineering practice requires that the splice joints be located where they will resist little or no bending moment. This allows the cable tray system to act as a continuous member with spans working in conjunction with one another to resist loading. When a cable tray system is installed with the splice joints located directly over the support, the previous continuous span condition is changed to one of a number of simple spans. These spans act independently of each other and excessive stress will occur at substantially less loading. Vertical straight lengths should be supported at intervals dictated by the building structure not exceeding 7.4 mtrs. on centers.A support should be located 600 mm on each side of an expansion connection.
There are two types of FRP cable trays:
• The cable ladders comprises two channel side rails connected by transverse rungs. All rungs to side channel connections have both a mechanical and adhesive lock. They are used for any mixture of power or lighting cables with any mixture of control or signal cables. For electrical service of 2000 volts or less and 2001 volts or more.
• The perforated type, solid bottom, pre- drilled cable tray are designed for light loads namely instrumentation and control cables and for transition from cable trays to individuals control points. Perforations are on standard 300 mm centres and provide both ventilation and sites for cable tie down.
Supports should be placed within 610 mm of each fitting extremity, and as follows: 90° supports at the 45° point of the ARC, 45° supports at the 22.5° point of the ARC (except for the 12” Ø), 30° supports at the 15° point of the ARC (except for the 305 mm Ø).
Vertical fittings at the top runs should be supported at each end. Fittings at the bottom of runs should be supported at the top of the fitting, and within 610 mm) of the lower extremity of the fitting.
Insta l la t ion Guide
Support Support
Straight Sections
splice atL/4
splice at
length of span = Lin multiple span condition
L/4
30 , 45, 90
2’-0’’ M
AX
2’-0’’ MAX
(.61m
)
(.61m)
1/2Ø Ø
2’-0’’ MAX
(.61m)Ø
Ø
Ø 30 45 60 90
Horizontal Tee Supports Horizontal Cross Supports
Supports should be placed within 610 mm of each of the three openings connected to other cable tray items for 305mm Ø. On all other radii, at least one support should also be placed under each side rail of the tee.
Supports should be placed within 610 mm of the four openings connected to other cable tray items for the 305mm Ø. On all other radii, at least one support should also be placed under each side rail of the cross.
2’-0’’ MAX
(.61m)
1/2
2/3 R
L
L
2’-0’’ MAX
TYP
TYP
TYP
2’-0’’ MAX
(.61m)
TYP
TYP
2’-0’’ MAX
(.61m)TYP
Reducer Fitting Supports Vertical Tee Supports
Straight reducer and right/left hand reducer fittings should be supported within 610 mm of each fitting extremity.
Vertical tee fittings should be supported within 610 mm of each fitting extremity
2’-0’’ MAX
(.61m)TYP
2’-0’’ MAX
(.61m)TYP
2’-0’’ MAX
(.61m)
2’-0’’ MAX
(.61m)TYP TYP
2’-0’’ MAX
(.61m)TYP
2’-0’’ MAX
(.61m)TYP
2’-0’’ MAX
(.61m
)TY
P
laddertypesystem
perforatedtype
system
GRP/FRP Cable Management Systems
• These are manufactured by assembling various cross sections like side runners / 'C' channels and rungs. According to the loading condition, a suitable 'C' channel is selected.
• The working (allowable) load capacity represents the ability of fibreglass cable ladder to support the static weight of the cables. It is equivalent to the destruction load capacity, with a minimum safety factor of 1.5.
• The longitudinal members or side runners are the pultruded 'C' sections, which provide excellent strength.
• The Cable Ladder width is the distance between two channels which is fitted by rungs / unistruts. It is the length of the rung / unistruts, between the two channels. The rungs / unistruts are inverted channels of 40 mm width x 20 mm depth and 4 mm thickness. The rungs are secured to the side runners / longitudinal members by SS 304 / SS 316 fasteners. The rungs are designed to eliminate rolling over. Our rung / unistruts length range is 150 mm, 200 mm, 300 mm, 400, 450 mm, 500 mm, 600 mm, 750 mm, 900 mm, 1000 mm and 1200 mm.
• The Cable Ladder length is the length of the side runner / 'C' channels. Our range is 3000 mm length.
• The Cable Ladder rang spacing is the distance between two rungs / unistruts. Our rung spacing is 300 mm.
• The Cable Ladder height is the height of the side runner / 'C' channel. Our range is 100 mm and 150 mm.
• The Cable Ladder tray thickness is the thickness of the side runner / 'C' channel. Depending upon the load condition the thickness is selected. Our range is 4 mm, 5mm and 6 mm.
• The fittings are used whenever cable needs to be bent at variable angles (90°, 60°) by using variety of fittings. The fittings are mitered at 305 mm radius. Whenever the width of the cable ladder needs to be changed, reducers are used. To run the cable three ways, 'T' fittings are used and likewise to run a cable four ways 'Cross' fittings are used.
H - Height T - Thickness W - Width (mm) (mm) (mm) 100 4 30 100 6 30 150 4 40 150 6 40
The perforated type, solid bottom, pre-drilled cable tray are designed for light loads i.e. instrumentation and control cables and for die transition from cable trays to individual control points.
• Load design is for a support span of 2.5 mtrs. Standard tray length is 3.0 mtrs.
• Maximum deflection range 12.7 - 25.4 mm.
• Load bearing UDL for other models are available on request.
Specif icat ionsPerforated Type Cable Trays
FRP Cable Tray covers
• Most economical installation with Thermo- plastic Drive Rivets
• Cover Hold Down Clamps allow cover to be removed for easy access to cables
• Available in ventilated & non-ventilated type.
Two nos. of Coupler / Splice Plates are required for each 3 mfrs. length of Cable Tray to be clamped with nuts & bolts on two ends for connecting it to another length of cable tray.
• Eliminates the Need to Drill or Punch Holes While Allowing for Normal Expansion
• This Guide becomes a clamp with use of a 316 SS set screw on top.
• Set SCREW is included with part.
• Guide is also easily adaptable for right or left sided installations.
Mitered F i t t ings for the Perforated Cable Tray
22°-30°
22°-30°
10”
AR
W
45°
10’’
A
R
W
22º-30º
22º-30º
45º
W1
18’’ (+57)
18’’ (
+57)
W2
18’’ (+57)
18’’ (+57
)
W1
W2
(8)
(13)
A
(38)
1/2’’
11/2’’
5/16’’
2’’ (51)1/4’’ Bolt
3/16’’ (5)
This catalogue is issued to provide outline information only and is not deemed to form part of an offer or contract. With the policy of continuous development, ARC reserves the right to change details without prior notice.