| • | Avoid excessive pressure when sawing, drilling, 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 Enduro sealant for sealing surfaces and cut edges after field cuts are made. |
| • |
When using adhesives, be sure to prepare the surface properly before applying. Follow label instructions carefully. A combination of mechanical fasteners and adhesives make the strongest, most reliable connections. |
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SUPPORT LOCATIONS
- Cable Tray & Fittings
(REFERENCE: NEMA FG
- 1 (current issue)
Straight Sections
Supports must be located
so that connectors (splice joints) between horizontal runs fall between
the support point and the quarter point of the span.
Vertical straight lengths should be supported at intervals dictated by the building structure not exceeding 24 Ft. on centers.
A support should be located 2 Ft. on each side of an expansion connection.
Supports should be placed within 2 Ft. (.61m) of each fitting extremity, and as follows: 90 degree supports at the 45 degree point of the arc, 45 degree supports at the 22.5 degree point of the arc (except for the 12" radii), 30 degree supports at the 15 degree point of the arc (except for the 12" radii).
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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 2 Ft. (.61m) of the lower extremity of the fitting. 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 2 Ft. (.61m) of the lower extremity of the fitting.
Supports should be placed within 2 Ft. (.61m) of each of the three openings connected to other cable tray items for 12" (305mm) radius. On all other radii, at least one support should also be placed under each side rail of the tee.
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Straight reducer and right/left hand reducer fittings should be supported within 2 Ft. (.61m) of each fitting extremity.
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Supports should be placed within 2 Ft. (.61m) of the four openings connected to other cable tray items for the 12" (305mm) radius. On all other radii, at least one support should also be placed under each side rail of the cross.
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Vertical tee fittings should be supported within 2 Ft. (.61m) of each fitting extremity.
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For Access After Installation
If the assembly will require occasional removal of the nuts, the rod should be lightly coated with a dry lubricant, silicon spray, or a light oil prior to assembly.
For Permanent Installation
If the assembly is designed to be a permanent installation, the nuts and studs should be bonded with an epoxy adhesive. Apply a light coating of adhesive to the stud and nut threads, then quickly secure the assembly before adhesive has time to set, otherwise the mil thickness of the adhesive will make it impossible to thread. Next, apply a thick coat of adhesive to the exposed stud and nut surfaces. This provides a locking mechanism which eliminates the need for extra torque and lock washers.
For Hanging System Installation
The optimum method of installation for a hanger system is to finger tighten the assembly and then only tighten the nuts one-half turn to secure any jam nut assemblies. Follow the permanent installation procedure whenever possible. This results in minimum torque and allows maximum thread shear.
To insure maximum resistance to chemical attack once the assembly is completed, the exposed stud thread and nut surfaces should be coated with EnduroSealª (Part No. ES-Q or ES-G; see pg. 31).
Metal and FRP Installation
When utilizing metal fasteners, connectors, or nuts, consideration must be given to reduced strengths. DuroThreadª rod and nuts are designed with maximum thread engagement and extra nut thickness. Metal products have less thread engagement. When installation requires metal components, special tests may be necessary to define ultimate strengths of the fastener systems. For Beam Clamp Installation Maximum installation torque of 10 foot-pounds is recommended to secure set screw.
Site Conditions
Vibration and dynamic loading conditions on the DuroThreadª assembly should be eliminated or minimized. If this is not possible, additional safety factors should be used in designing the fastener system.
Tools Required
The oversize hex nut design of the DuroThreadª nut requires a larger than normal socket wrench, but either a six point or twelve point socket will work.
Important - do not exceed the torque values listed in the table above.
Caution
Do not over torque the DuroThreadª nut and rod. The thread shear and torque values are NOT mutually exclusive, they are additive.
| Example: 1/2" - 13 has a thread shear of 2,200 Lbs. and an ultimate torque strength of 18 foot-pounds. If you use the maximum installation torque of 8 foot-pounds, the amount of thread shear remaining is reduced to 1,225 pounds. Specifying engineers should apply this information at the design stage, applying the proper safety factors to insure a secure installation. |
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DuroStrut™ Loading INFORMATION - CHANNEL FRAMING
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Loading Table Description:
Beam Loads: Table lists the total allowable load for various simple spans based on a minimum safety factor 2:1. If load is concentrated at center of span, multiply the load from the table by 0.5 and the corresponding deflection by 0.8.
Column Loads: Table lists the total allowable axial load for various unsupported column heights based on a minimum safety factor of 3:1. Eccentric loads should be reduced according to standard practice.
Notes: All beams should be supported in a manner to prevent rotation at supports. Long, deep beams should be tied between supports to prevent twist. * = Deflection is in excess of 3.00 In. (76mm); mid-span support is recommended. NR = Not Recommended
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DuroStrut™
Guide Specification
1.0 Scope
1.1 This specification covers the requirements for Enduro Systems non-metallic
Channel Framing Systems & Accessories.
2.0 Standards
2.1 All channel shall have a flame spread rating of 25 or less, and the
Smoke Developed Index shall have a density of 450 or less when tested
in accordance with the provisions of ASTM E-84; therefore qualifying as
a class 1 material in the Uniform Building Code.
2.2 All channel shall have a Nexus polyester surfacing veil over the entire
surface in addition to a UV inhibitor in the resin system to protect against
degradation from ultra-violet light.
3.0 Materials
3.1 All channel shall be manufactured by the pultrusion process, and contain
a minimum of 50% glass by weight.
3.2 All channel shall conform, as a minimum requirement, to loads and
deflections shown on the tables in the latest version of the Enduro Systems
Composite Products Division technical catalog.
4.0 Non-Metallic Pipe Clamps
4.1 All pipe clamps shall be manufactured by the injection molding process
with an impact modified, 30% glass filled thermoplastic polyester resin.
4.2 All pipe clamps interlock with the channel framing described above.
4.3 All pipe clamps shall be designed for rigid PVC coated steel, Schedule
40 or 80 PVC, and filament wound fiberglass pipe or conduit. Clamps shall
be adjustable to accommodate a 3/4" minimum deviation in O.D. size.
5.0 Fasteners
5.1 All fasteners shall be injection molded glass reinforced nylon, 316
stainless steel, or pultruded vinyl ester rod with ground threads and
compression molded vinyl ester nuts.
6.0 Acceptable Manufacturer
6.1 DuroStrut™ is manufactured and fabricated exclusively by Enduro
Systems, Inc. Composite Products Division- Houston, TX.
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| Mechanical (coupon) | FR-P | FR-VE |
| Longitudinal Direction | ||
| Ultimate Tensile Strength, psi (ASTM D638) |
30,000
|
35,000
|
| Ultimate Compressive Strength, psi (ASTM D695) |
30,000
|
35,000
|
| Ultimate Flexural Strength, psi (ASTM D790) |
30,000
|
35,000
|
| Tensile Modulus, psi x 106 |
2.5
|
3.0
|
| Compressive Modulus, psi x 106 |
2.5
|
2.5
|
| Flexural Modulus, psi x 106 |
1.6
|
2.0
|
| Ultimate Shear Strength, psi |
5,500
|
7,000
|
| Ultimate Bearing Stress, psi |
30,000
|
35,000
|
| Izod Impact Strength, Ft.-Lbs. per inch of notch (ASTM D256) (sample thickness 1/8" except 1/4" for rod) |
25
|
30
|
| Electrical | ||
| Electric Strength, short term in oil, 1/8", vpm (ASTM D149)* |
200
|
200
|
| Electric Strength, short term in oil, KV per inch |
35
|
35
|
| Dielectric Constant, 60 Hz. (ASTM D150)* |
5.6
|
5.2
|
| Dissipation Factor, 60 Hz. (ASTM D150)* |
0.03
|
0.03
|
| Arc Resistance, seconds (ASTM D495)** |
120
|
120
|
| Fire Retardant Properties | ||
| Flame Resistance, ign/burn, seconds (FTMS 406-2023) |
75/75
|
75/75
|
| Intermittent Flame Test, rating (HLT-15) |
100
|
100
|
| Flammability Test, average time of burning 5 seconds, average extent of burning 15mm (ASTM D635) | ||
| Surface Burning Characteristics, maximum (ASTM E84) |
15
|
15
|
| Mechanical (coupon) |
FR-P
|
FR-VE
|
| Transverse Direction | ||
| Ultimate Tensile Strength, PSI |
7,000
|
10,000
|
| Ultimate Compressive Strength, PSI |
15,000
|
20,000
|
| Ultimate Flexural Strength, psi |
10,000
|
14,000
|
| Tensile Modulus, psi x 106 |
0.8
|
1.0
|
| Compressive Modulus, psi x 106 |
1.0
|
1.2
|
| Flexural Modulus, PSI x 106 |
0.8
|
1.0
|
| Ultimate Shear Strength, psi |
5,500
|
6,000
|
| Ultimate Bearing Stress, psi |
30,000
|
35,000
|
| Izod Impact Strength, Ft.-Lbs. per inch of notch (ASTM D256) |
4
|
5
|
| Barcol Hardness (ASTM D2583-75) |
50
|
50
|
| Full Section in Bending | ||
| Modulus of Elasticity, psi x 106 |
2.5
|
3.0
|
| Tensile Strength, psi |
20,000
|
25,000
|
| Compressive Strength, psi |
20,000
|
25,000
|
| Thermal | ||
| Thermal Coefficient of Expansion, Inches/Inch/¡F (ASTM D696)** |
5 x 10-6
|
5
x 10-6
|
| Thermal Conductivity, BTU per Sq. Ft./Hr./¡F/In. (ASTM C-1776-76) |
4
|
4
|
| Specific Heat, BTU/Lb./°F |
0.28
|
0.28
|
| Other | ||
| Density, Lbs./In.3 (ASTM D792) |
0.065
|
0.065
|
| Specific Gravity (ASTM D792) 1.80 |
1.80
|
1.80
|
| Water Absorption, Max. % by weight (24 hour immersion) (ASTM D570) |
.50
|
.50
|
| *
Specimen tested perpendicular to laminate face. Note: 1 PSI = 6.894
K Pa, 1 Ft.-Lb./In. = 5.443 kg-m/m ** Indicates reported value measured in longitudinal direction. Note: Depending on the specific glass content and resin, the strength and stiffness properties may be significantly higher. Refer to FR-VE Resin for fire retardant properties of threaded rod. Test results are for studs with single nuts only. Proper safety factors should be applied to testing. All values are based on laboratory test results. |
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| For additional information refer to DuroStrutª Installation Guide (above). | |||||
| Properties |
3/8-16
UNC
|
1/2-13
UNC
|
5/8-11 UNC
|
3/4-10
UNC
|
1-8
UNC
|
| Thread shear strength using fiberglass nut in tensile - Lbs. |
1,250
|
2,200
|
3,100
|
4,500
|
6,500
|
| Transverse shear on threaded rod - double shear (load Lb.) (ASTM-B565) |
3,000
|
5,000
|
7,500
|
12,000
|
22,000
|
| Transverse shear on threaded rod - single shear (load Lb.) |
1,600
|
2,600
|
3,800
|
6,200
|
15,000
|
| Compressive strength longitudinal, psi (ASTM-D695) |
54,000
|
54,000
|
54,000
|
54,000
|
65,000
|
| Flexural strength, psi (ASTM-D790) |
55,000
|
55,000
|
55,000
|
55,000
|
60,000
|
| Flexural modulus, psi x 106 (ASTM-D790) |
2.0
|
2.0
|
2.0
|
2.50
|
2.75
|
| Torque strength using fiberglass nut lubricated with SAE 10W30 motor oil, Ft.-Lbs. |
8
|
18
|
35
|
50
|
110
|
| Dielectric strength, KV/In. (ASTM-D149) |
35
|
35
|
35
|
35
|
35
|
| Water absorption 24 hour immersion - threaded, % (ASTM-D570) |
1
|
1
|
1
|
1
|
1
|
| Coefficient of thermal expansion - longitudinal In./In./°F |
5
x 10-6
|
5
x 10-6
|
5
x 10-6
|
5
x 10-6
|
5 x 10-6
|
| Max recommended operation temp - based on 50% retention of ultimate thread shear strength °F |
200
|
200
|
200
|
200
|
200
|
| Stud weight, Lb./Ft. |
0.07
|
0.12
|
0.18
|
0.28
|
0.50
|
| Flammability |
Self-extinguishing
on all.
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Note: 1 Ft.-Lb.
= .138 kg-M; 1 Lb = .4536 kg, 1 PSI = 6.984 K Pa |
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ENDURO
FIBERGLASS LADDER-TYPE CABLE TRAY SPECIFICATION
1.0 Scope
1.1 The cable tray system shall conform to the material and fabrication
requirements as per this specification.
2.1 The cable tray system shall conform to applicable sections of:
| 2.1.1 | NEMA Standard FG-1 (latest edition) |
| 2.1.2 | National Electric Code (NEC) |
| 2.1.3 | ASTM E-84 (Class 1 Rating) |
| 2.1.4 | UL (Underwriters Laboratories, Inc.) Standards for Non- Metallic Cable Trays. |
3.0 General
3.1 Tray Requirements
| 3.1.1 | Tray widths 6" (152mm), 9" (229mm), 12"(305mm), 18" (457mm), 24" (610mm), 30" (762mm), and 36" (914mm). |
| 3.1.2 | Lengths (as required): 10 Ft. (3m),and 20 Ft. (6m). |
| 3.1.3 | Rung spacing (as required): 6" (152mm), 9.25" (235mm), 12" (305mm), and 18.5" (470mm). |
| 3.1.4 | Radius of fittings (as required): 12" (305mm), 24" (610mm), and 36" (914mm). |
| 3.1.5 | Resin Systems (as required): Isophthalic Polyester or Vinyl Ester. |
3.2 Loading Requirements
| 3.2.1 | There shall
be three working load classifications of fiberglass cable tray based
on 20 Ft. (6m) support span with a minimum safety factor of 1.5:
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| 3.2.2 | Span support
criteria shall be as specified (Reference the following table)
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| 3.2.3 | Nominal loading depth (as required): 2" (51mm), 3" (76mm), 5" (127mm), 7" (178mm) and 9" (229mm). | |||||||||||||||||||||||||||||||
4.0 Materials
| 4.1 | The glass fiber to resin content shall be maintained between 45 to 55 percent by weight in all pultruded components except flat sheet which shall be 35 to 45 percent; and, 25 to 45 percent by weight in all molded components. |
| 4.2 | All composite material shall have an ultraviolet light inhibiting chemical additive to resist UV degradation. |
| 4.3 | All composite material shall be fire retardant and have a flame spread rating of 25 or less (Class 1 Rating) when tested in accordance with ASTM E-84. |
| 4.4 | All pultruded products shall have a complete Nexus surfacing veil to provide maximum chemical and UV protection. |
5.0 Construction
| 5.1 | Straight section tray shall be fiberglass reinforced meeting all the requirements herein described. |
| 5.1.1 | The side rail members must turn in. |
| 5.1.2 | All rung to side member connections shall have both a mechanical and a chemical (adhesive) lock. The tray shall be assembled by the use of a locking pin made of fiberglass reinforced thermoplastic. The locking pin shall be inserted under pressure with a high strength, chemical resistant adhesive. |
| 5.1.3 | All bonded connections must be sanded to maximize adhesion and structural integrity. |
| 5.1.4 | The tray interior shall be clear of all projections or sharp objects. |
| 5.1.5 | All straight section lengths shall be pre-drilled to accept connector plates. |
| 5.1.6 | All cut ends and drilled holes (factory and field) shall be resin coated. |
| 5.2 | Fittings are to be pre-fabricated and shall meet all the requirements herein described. |
| 5.2.1 | All fittings shall have a nominal 9.25" rung spacing. |
| 5.2.2 | All fittings shall be pre-drilled to accept connector plates. |
| 5.2.3 | All fittings shall be designed and installed so as to have the same load carrying capacity as the straight sections. |
| 5.2.4 | Rung to side member connections shall have both a mechanical and/or chemical (adhesive) lock. Fittings shall be assembled by use of a locking pin made of fiber- glass reinforced thermoplastic and/or a stainless steel rivet. The locking pin shall be inserted under pressure with a high strength chemical resistant adhesive. |
|
•
|
All radius 90° and 45° horizontal and vertical bends, all tee's and crosses for tray types using 6" (152mm), and most 4" (101mm) and 8" (202mm), C-channel members shall be of concentric curved molded design and made by resin transfer molding. |
5.3 Connector Plates and Fasteners:
| 5.3.1 | Connector plates shall be fiberglass and designed with sufficient strength so they may be installed between 0.2 and 0.3 of the length of the span from the support without derating the load carrying capacity of the tray. |
| 5.3.2 | Fasteners for connector plates shall be 3/8" (9.5mm) diameter Type 316 Stainless Steel, Monel, Silicon Bronze, or FRP studs & hex nuts as required. |
5.4 Accessories
| 5.4.1 | The manufacturer shall be capable of providing all necessary parts (i.e. clamps, support assemblies, etc.) for the installation of a complete fiberglass tray system. |
6.0 Acceptable Manufacturer
| 6.1 | The fiberglass
ladder type cable tray system shall be manufactured - pultrusion,
compression molded, resin transfer molded and/or fabricated by Enduro
Systems, Inc. Composite Products Division, of Houston, Texas USA.
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