Sec_27_0538_L-V_CABLE_TRAY.pdf

OANG 180th Fighter Wing - Swanton, Ohio URS

WYTD 079032 - Construct ACA Alert Crew Quarters FacilityURS Project No. 14578137

1 December 2015 Type B Services - B3 Submission

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SECTION 27 0538

LOW-VOLTAGE CABLE TRAY

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. General: Drawings and general provisions of the Contract, including General and Supplementary Conditions and all divisions of specification sections, apply to this Section.

1.2 DESCRIPTION OF WORK

A. General: The Contractor shall provide the labor, tools, equipment, and materials necessary to install the wire mesh cable tray system in accordance with the plans and as specified herein.

B. Extent of cable trays is indicated by drawings and schedules.

C. Types of cable trays in this section include the following:

1. Open-wire mesh cable tray.

D. Cable trays are to support low voltage wiring only. A 2” wide by 4” high dedicated compartment in the cable tray shall be established to support the fire alarm cabling only.

1.3 QUALITY ASSURANCE

A. Codes and Standards: Perform all work associated with cable trays in compliance with applicable requirements of governing agencies having jurisdiction and in accordance with these Plans and as specified herein.

1. National Electrical Manufacturers Association (NEMA) Compliance: Comply with applicable requirements of NEMA VE-1 1979 standards pertaining to cable trays.

2. Underwriters' Laboratories, Inc. (UL) Compliance and Labeling: Comply with provisions of UL safety standards pertaining to electrical cable tray systems; and provide products and components which have been UL-listed and labeled. Cable trays shall be classified as grounding conductors.

3. National Electrical Code (NEC) Compliance: Comply with NEC Article 318 requirements applicable to construction of cable tray systems.

B. Manufacturers: Firms regularly engaged in manufacture of cable tray systems of types and sizes required, whose products have been in satisfactory use in similar service for not less than 5-years.

C. Installer: Qualified with at least 3-years of successful installation experience on projects with wire mesh cable tray work similar to that required for this project.

1.4 SUBMITTALS

A. Furnish manufacturer's product data, test reports, and material certifications as required.

B. Submit manufacturer's data, including specifications, installation instructions, and general recommendations for each type of cable tray and each fitting type required. Include data substantiating that materials comply with requirements as specified herein.

C. Submit dimensioned drawings of cable tray systems showing details of cable tray fittings.

D. Submit certified copies of factory test reports performed in conformance with NEMA Standard VE 1 on cable trays of types and size specified for this Project.

1.5 DELIVERY, STORAGE, AND HANDLING

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A. Deliver cable trays and components properly packaged in factory-fabricated-type containers or wrappings, which properly protect devices from damage.

B. Store cable trays and components in original packaging and protect from weather and construction traffic.

Wherever possible, store indoors, where necessary to store outdoors, store above grade and enclose with watertight wrapping.

C. Handle cable trays and components carefully to prevent physical damage. Do not install damaged devices, remove from site and replace damaged devices with new.

PART 2 - PRODUCTS

2.1 MATERIALS

A. Open-Wire Mesh Cable Tray

1. Provide cable trays and accessories of sizes indicated or required for a complete system installation.

2. Cable tray shall be manufactured from high-strength carbon steel wire welded mesh with a continuous safety edge wire lip.

3. Cable tray lengths shall be galvanized after all welding and bending.

4. Cable tray shall be a minimum of 4-inches deep.

5. Cable tray mesh shall have a 4-inch maximum wire spacing linear and 2-inch maximum across.

6. Fittings shall be field-fabricated from straight sections of tray and hardware per written recommendations of the manufacturer.

7. Provide a grounding terminal at 12-feet maximum spacings. Provide ground cable support hangers at

3-feet maximum spacings.

B. Supports and Connectors: Cable tray supports and connectors, including bonding jumpers, shall be as recommended by cable tray manufacturer.

C. Fasteners for Supports: Fasteners to connect cable tray supports to the building structure shall be carbon steel wedge or sleeve-type expansion anchors.

2.2 MANUFACTURERS

A. Subject to compliance with requirements, manufacturers offering open-wire mesh cable tray which may be incorporated in the work include the following:

1. Chalfant Cable Trays Company.

2. Husky Products, Inc.

3. B-Line Systems, Inc.

4. Flex Tray / GS Metals Corp.

PART 3 - EXECUTION

3.1 INSTALLATION

A. General: Install open-wire mesh cable tray systems where indicated on the drawings. Install the trays at approximately 6-inches above the lay-in ceiling to the bottom of the tray. The tray systems shall be installed complete with hangers, supports, fittings, and connectors or other devices required or indicated in accordance with the NEC requirements, National Electrical Contractors Association (NECA) "Standards of Installation" and the manufacturer's written recommendations.

B. Coordinate with other work as necessary to interface installation of cable tray with the systems cabling.

C. Level and square cable trays and install at proper elevations.

D. Complete installation of cable trays before starting installation of systems cabling.

E. Unless otherwise indicated, fasten cable tray supports securely to the building structure and as specified in

Division 26 Section “Supporting Devices”.

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F. Make changes in direction of cable tray with field fabricated bends, cuts, and clamped connection fittings.

G. Install cable trays with sufficient space above to permit access for installing cables.

H. Wherever possible, install horizontal cable trays above water and steam piping.

I. Upon completion of installation of cable trays, inspect interior surfaces of trays and remove burrs, dirt, and construction debris before installation of system cabling.

J. No cable trays are to penetrate full height walls. Full height walls are to be provided with wall sleeves (pre-loaded with fire-stopping materials) with cable trays terminating within 12” of the wall.

1. Wall sleeves are to be installed above cable trays no higher than 12” above tray to the bottom of the sleeves.

3.2 IDENTIFICATION

A. Provide each length of cable tray with a plastic laminate nameplate attached to side of tray per specification

Section “Identification”.

1. The dedicated compartment of the cable tray is to be labeled “DEDICATED COMPARTMENT FOR

FIRE ALARM CABLING ONLY”.

3.3 GROUNDING

A. Electrically ground cable trays and ensure continuous electrical conductivity of cable tray system. Install a #6 bare copper ground conductor from the TR’s TGB the entire length of cable tray cable tray. Bond the tray to the ground conductor every 12-foot on-center with a ground connector specifically designed for such service.

3.4 FIELD TESTING

A. Grounding: Test cable trays to ensure electrical continuity of bonding and grounding connections.

3.5 CLEANING AND FINISH REPAIR

A. Upon completion of installation of cable trays, inspect trays, fittings, and accessories. Remove burrs, dirt, and construction debris and repair damaged finish including chips, scratches, and abrasions.

END OF SECTION 27 0538

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