Appendix C - Cable Trays Specification.pdf

UNCLASSIFIED – FOR OFFICIAL USE ONLY

SECTION 27 05 28.36 40:

CABLE TRAYS FOR COMMUNICATION SYSTEMS

APPENDIX C FOR CABLE TRAY SUPPORT REPLACEMENT

EFFECTIVE DATE: 24-FEBRUARY 2020

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PART 1 GENERAL

1.1 REFERENCES

The publications form a part of this specification to the extent referenced. The publications are referred within the text by the basic designation only. The current revision of the reference, including all issued updates, must be followed.

1.2 SUBMITTALS

DISA (Defense Information Systems Agency, Facility Engineering, Denver) approval is required for all submittals. Submit the following in accordance with Section 01 33 00, Submittal Procedures:

SD-02 Shop Drawings

Fabrication Drawings

Installation Drawings

SD-03 Product Data

Cable Trays

Supports

SD-05 Design Data

Seismic Performance Calculations

Structural Calculations

SD-06 Test Reports

Loading Test

Equipotential Bonding Test

SD-08 Manufacturer’s Instructions

Manufacturer’s Instructions

SD-10 Operation and Maintenance (O&M) Data

Warranty

1.3 QUALITY CONTROL

Provide wire basket cable trays in accordance with the following:

a. All cable and equipment must be installed in a neat, safe and secure manner. All methods of assembly and installation that are not specifically described or indicated in the Contract documents are subject to the control and approval of the Government.

b. Supply all cable trays and accessories in accordance with the following:

(1) New and free from defects.

(2) Uniform quality and appearance.

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(3) In accordance with all applicable codes and standards, including but not limited to the following:

(a) IEC 61537

(b) NEMA VE 1

(c) NFPA 70 Article 392 for the assembly and installation of cable tray and cable channel systems.

(d) NFPA 70B for installation of cable tray systems.

(e) ANSI/TIA-569

(f) ANSI/TIA-942

(4) All accessories for the cable tray, including hangers must be supplied by the same cable tray manufacturer

(5) Provide products that are UL-certified and labeled with the UL mark.

(6) Certified as a conductor for Equipotential Bonding and labeled as a conductor for equipotential bonding.

1.4 DELIVERY, STORAGE, AND HANDLING

Carefully handle, store, and protect materials to prevent damage before and during installation in accordance with manufacturer's recommendations, and as approved by the Contracting Officer. Replace damaged or defective items. Protect from the weather, humidity and temperature variation; and dirt, dust, or other contaminants.

Deliver equipment to an inside location in the facility. Provide all necessary equipment and lifts to receive and move the delivered equipment. Coordinate inside delivery with the Government 30 days prior to shipping. Coordinate interim indoor storage requirements and location with the Government as soon as possible. Ensure the onsite storage conditions meet the minimum manufacturer requirements to ensure warranty coverage. Provide physical installation to the final location inside the facility.

1.5 WARRANTY

Provide a one-year, onsite, parts and labor manufacturer warranty, in writing, against defects in material and workmanship for 12 months after substantial project completion at no additional cost to the Government. The manufacturer agrees to repair or replace components that fail in materials or workmanship. Warranty must include all labor, travel, material, and related expenses to restore system and/or components from failures through the warranty period.

PART 2 PRODUCTS

2.1 SYSTEM DESCRIPTION

Provide cable tray of types and sizes indicated with connector assemblies, clamp assemblies, connector plates, splice plates and splice bars. Assemble units with rounded edges and smooth surfaces; in accordance with applicable standards; and with the additional requirements of this specification section.

2.1.1 Design Requirements

2.1.1.1 Structural Calculations

Submit structural calculations for the wire basket cable trays, completed by a licensed Professional Engineer.

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2.1.2 Performance Requirements

2.1.2.1 Seismic Performance

Units must withstand the effects of a seismic event. Provide all necessary bracing and supports to meet requirements for installation for the site seismic design category in accordance with IBC.

The term “withstand” means “the unit remains in place without separation of any parts when subject to the seismic forces specified and remain fully operational after the seismic event.”

2.2 FABRICATION

Submit fabrication drawings for wire basket cable trays.

Ensure the finishes of edges, fittings, and hardware are free from burrs and sharp edges. Include splice and end plates, dropouts, and miscellaneous hardware.

2.3 EQUIPMENT

Submit manufacturer's product data for

• Wire basket cable trays, including accessories

• Supports

2.3.1 Standard Products

Provide materials which are the standard products of a manufacturer regularly engaged in the manufacture of such products which are of equal material, design and workmanship. Products must meet the following:

a. Satisfactorily used in commercial or industrial facilities for at least 2 years prior to bid opening, including applications of materials under similar circumstances and of similar size.

b. Available for purchase in the commercial market through advertisements, manufacturer’s catalogs, or brochures for at least 2 years prior to bid opening.

c. Single manufacturer.

2.3.2 Manufacturer's Instructions

Submit the manufacturer's instructions for cable trays, supports, and accessories, including any special provisions. Ensure that the instructions specify impedances, hazards and safety precautions.

2.4 COMPONENTS

2.4.1 Wire Basket Cable Tray

Wire basket cable tray sizes for installation at DISA datacenters depends on the planned and potential datacomm load. Provide wire basket cable tray sizes in accordance with the following:

a. Provide straight sections in standard lengths. Use the following when available:

(1) Manufacturer’s standard length, typically 8 ft (2500 mm).

(2) Basket wall height of 2 inches (60 mm)

(3) Basket tray width of 4 inches (120 mm), 8 inches (220 mm), 12 inches (320 mm), 16 inches (420 mm), or 20 inches (520 mm), as required to support number of cables at 60% maximum fill.

b. A base liner is required for IT cable. Use only solid metal or solid metal flanged base liners.

(1) Straps are NOT permitted.

(2) J-hooks may only be used where not visible (i.e., above a drop ceiling)

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c. Capable of jointing with any existing cable trays.

d. Smooth wire ends, no sharp edges

e. Material: coated steel wire

f. Coating: ASTM A123/A123M or ISO 1461 Zinc (Hot-Dip Galvanized)

(1) Electroplated Zinc is NOT permitted

g. General Requirements: ASTM A510 or IEC 61537

h. Thickness: 0.196 inches (5 mm) diameter minimum

i. Equipotential bonding of the entire system without the use of a separate continuous copper conductor the full length of the cable tray.

2.4.2 Cable Tray Accessories

All cable tray accessories must be produced by the same manufacturer as the wire basket cable tray. At a minimum, accessories must include the following, regardless of project requirements:

a. Square corners, created by one of the following:

(1) Manual joining of straight sections of wire basket cable trays in accordance with manufacturer’s instructions.

(2) Corner fittings

b. Radius corners based on minimum bending radius of the cables, created by one of the following:

(1) Modifying straight sections of wire basket cable trays in accordance with manufacturer’s instructions

(2) Radius fittings

c. Basket divider for routing fiber optic separate from copper cable.

d. Waterfall attachment to limit cable radius when dropping between trays or to equipment.

e. Caps to prevent sharp edges after cutting wire baskets.

f. Earthing clamp to maintain equipotential bonding of cable tray system at corners, level changes, and intersections.

All fittings, brackets bolts, and nuts required to assemble the cable trays must be provided by the wire basket cable tray manufacturer, and in accordance with the following:

a. Material: coated steel

b. Coatings: ASTM A123/A123M or ISO 1461 Zinc (Hot-Dip Galvanized), or ISO 11997 Zinc/Nickel

(1) Electroplated Zinc is NOT permitted

c. General Requirements: ASTM A510 or IEC 61537

d. Equipotential bonding of the entire system

e. No sharp edges

2.4.3 Cable Tray Supports

Supports must meet the following:

a. In accordance with structural calculations and manufacturer’s instructions.

b. Manufactured by the wire basket cable tray manufacturer.

c. In accordance with the following:

(1) Material: coated steel

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(2) Coatings: ASTM A123/A123M or ISO 1461 Zinc (Hot-Dip Galvanized), or ISO 11997 Zinc/Nickel

(a) Electroplated Zinc is not permitted

(3) General Requirements: ASTM A510 or IEC 61537

(4) Equipotential bonding of the entire system

(5) No sharp edges

d. Permit both vertical and horizontal adjustment, where possible on supports and hangers. Provide an adequate bearing surface for the tray on the horizontal and vertical tray supports, and ensure that the surface can accommodate holddown clamps or fasteners. Provide a means, other than friction, for securely fastening cable trays to supports.

e. Ensure that the cable trays can carry at least 39 pounds per linear foot (59 kilograms per linear meter) when supported at 8 foot (2.5 meter) intervals.

f. Mount the supports in accordance with the following:

(1) Ceiling or wall mounted for overhead cable trays.

(2) Floor mounted for cable trays under access flooring.

(3) Ceiling, wall, or floor mounted for vertical sections.

(a) Vertical sections of tray are acceptable when moving from one building floor to another and must have adequate strain relief components.

(4) Provide anchors and ties for cavity walls. Do not specify corrugated metal ties or ties with an integral drip.

g. Diagonal and perpendicular installations of spanner supports are both acceptable.

h. Bars and allthread rods are acceptable.

2.5 TESTS, INSPECTIONS, AND VERIFICATIONS

Submit the following manufacturer’s test data in accordance with IEC 61537 for the wire basket cable tray, including accessories:

• Loading Test

• Equipotential Bonding Test

PART 3 EXECUTION

Section 26 00 00.00 20, Basic Electrical Materials and Methods, applies to work performed in this section.

3.1 EXAMINATION

After becoming familiar with all details of the work, verify all dimensions in the field, and advise the Contracting Officer of any discrepancy before performing the work.

3.2 INSTALLATION

Install in accordance with installation drawings and the following:

a. Install cable tray above suspended ceiling and below access floor.

b. Install using long straight lines to reduce damage to cabling during installation.

(1) Join cable tray sections using the appropriate manufactured component(s) which lend sufficient rigidity to allow the joint to support both the weight of the cable tray and potential cable loading.

(2) Provide sufficient space encompassing cable tray to permit access for installing and maintaining cables, typically 25% initial loading.

(3) Coil excess cable in baskets.

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(4) Include consideration for the continued proper operation of smoke detection, fire suppression, and emergency and general lighting components.

(5) Install in a configuration which permits access to the entire cable tray.

(6) Install bridges at tees and intersections:

(a) Install fiber optic on the bridge if not routed to the intersecting tray

(b) Waterfall cables using an accessory to limit cable radius when using the bridge

(7) Do not block or reduce visibility of security cameras.

(8) Do not block or impede fire sprinkler heads in accordance with NFPA 13.

(9) Do not cut cable trays in the building using a hacksaw or any device which could create metal shavings. A “pinch” type tool is acceptable for use in the building.

(10) Install caps from the cable tray manufacturer on exposed cut cable tray wires

(11) Join cable tray sections using electrically continuous components.

(12) Cable tray system must be certified as an equipotential grounding conductor. Do not use to connect to equipment as a ground conductor.

c. Grounding:

(1) For installations above the access floor, bond cable tray to SRG ground loop at a minimum of

120 inches apart or a minimum of 4 places for each computer room.

(2) For installations below the access floor, bond cable tray to SRG ground loop at location where the cable tray crosses the SRG.

(3) For solid floor computer rooms, the ground conductor for the SRG is attached to the outside of the cable tray.

(4) Ground metal cable trays in accordance with NFPA 70 Article 318 and the DISA Minimum

Technical Specification for Signal Reference Grid for Grounding. Cable tray systems containing conductors outside the scope of NFPA 70 Article 250 (i.e., communications, data, and signal cables) require proper bonding and grounding.

(a) Do not ground to any of the following types of equipment: PDUs, transformers, humidifiers, CRAC, or CRAH units.

(5) The cable tray equipotential bonding must have an impedance that is low enough to limit the potential above ground and to facilitate operation of overcurrent devices in the circuit. Provide grounding and bonding for cable trays in accordance with NFPA 70.

(6) Test cable tray support systems to ensure electrical continuity of bonding and grounding connections, and to demonstrate compliance with specified maximum grounding resistance. See NFPA 70B, Chapter 18, for testing and test methods.

d. Special accessories must be provided as required to protect, support and install a cable tray system.

(1) Use plastic bushings around allthread supports when the support is in the middle of the cable tray to protect communication cables from sharp edges.

e. Firestop all cable tray penetrations.

(1) In accordance with local and NFPA regulations to sustain fire ratings when passing through fire-rated elements.

(2) Provide a gaseous seal

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(3) Use firestop material which can be easily removed and replaced to accommodate future cable installations are preferred.

f. Do NOT install electrical power distribution cabling in datacomm cable trays.

3.2.1 Installation Drawings

No later than 30 calendar days before shipment, submit installation drawings to the Contracting Officer for approval. Coordinate drawings with those being used for all other work in the immediate area to ensure that this other work does not conflict with the installation. Include the layout of the cable tray work and details on both horizontal and vertical supports as specified in paragraph 2.4.3, Cable Tray Supports.

3.3 ADJUSTING AND CLEANING

Thoroughly clean surfaces of piping and equipment that have become covered with dirt, plaster, or other material. Before final acceptance, ensure cable trays and areas around the cable trays are free from dirt and debris. Incorporate housekeeping for field work which leaves everything in the affected area free of generated dust and debris; and, all floor surfaces vacuum-swept clean. Maintain all materials installed under the Contract until close out documentation is received, the project is completed and the building has been documented as beneficially occupied.

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2.5 Tests, inspections, and Verifications

3.3 Adjusting and Cleaning