27 05 28.36 40 CABLE TRAYS FOR COMMUNICATIONS SYSTEMS.doc

SECTION 27 05 28.36 40

CABLE TRAYS FOR COMMUNICATIONS SYSTEMS

NOTE: This specification covers the requirements for materials and installation of cable-tray systems.

Contract drawings should indicate the extent and general arrangement of the cables, equipment, and distribution systems and should indicate cable-tray supports.

Edit this guide specification for project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or insert appropriate information.

Remove information and requirements not required in respective project, whether or not brackets are present.

Comments and suggestions on this guide specification are welcome and should be directed to the technical proponent of the specification. A listing of technical proponents, including their organization designation and telephone number, is on the Internet.

Recommended changes to a UFGS should be submitted as a Criteria Change Request (CCR).

PART 1 GENERAL

1.1 REFERENCES

NOTE: This paragraph is used to list the publications cited in the text of the guide specification. The publications are referred to in the text by basic designation only and listed in this paragraph by organization, designation, date, and title.

Use the Reference Wizard's Check Reference feature when you add a RID outside of the Section's Reference Article to automatically place the reference in the Reference Article. Also use the Reference Wizard's Check Reference feature to update the issue dates.

References not used in the text will automatically be deleted from this section of the project specification when you choose to reconcile references in the publish print process.

1.1.1 The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only. Unless other wise noted, the latest published version and/or revision shall be used.

1.1.1.1 ASTM INTERNATIONAL (ASTM)

a. ASTM A 1008 Standard Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Strength Low-Alloy and High-Strength Low-Alloy with Improved Formability, Solution Hardened, and Bake Hardened

b. ASTM A 123 Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

1.1.1.2 NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

a. NFPA 70 National Electrical Code

1.2 GENERAL REQUIREMENTS

NOTE: If Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS AND METHODS is not included in the project specification, applicable requirements therefore should be inserted and the following paragraph deleted.

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

1.3 SUBMITTALS

1.3.1 Government approval may be required on any of the following items. Items requiring submittals will be listed on the AF Form 66. Provide copies of all submittals per the requirements in Section 01 33 00, Submittal Procedures, or as listed on the AF Form 66.

1.3.1.1 SD-02 Shop Drawings

a. Fabrication Drawings

b. Installation Drawings

1.3.1.2 SD-03 Product Data

a. Manufacturer's product data shall be submitted for the following items:

(1) Cable Trays

(2) Supports

1.3.1.3 SD-08 Manufacturer's Instructions

a. Manufacturer's instructions shall be submitted for cable trays in accordance with paragraph entitled, "Manufacturer's Instructions," of this section.

PART 2 PRODUCTS

2.1 CABLE TRAYS

2.1.1 Cable trays shall be the type and size as indicated on the drawings.

2.1.2 Ladder cable trays shall consist of two longitudinal side members connected by individual transverse members.

2.1.3 Trough cable trays shall consist of continuous one-piece ventilated-bottom sections contained within longitudinal side members.

2.1.4 Channel cable trays shall consist of one-piece ventilated channel sections.

2.1.5 Solid bottom trays shall consist of two longitudinal side members connected by one-piece bottom section.

2.2 MATERIAL AND FABRICATION

2.2.1 Cable trays shall be high-strength corrosion-resistant aluminum Alloy No. 5052-H32 or steel sheet in accordance with ASTM A 1008 with a zinc coating applied after fabrication as indicted.

2.2.2 Steel trays shall be hot-dipped galvanized finish in accordance with ASTM A 123.

2.2.3 Fabrication drawings shall be submitted for cable trays consisting of fabrication and assembly details to be performed in the factory.

2.2.4 Prior to assembly, contact surfaces of trays shall be coated with an antioxidant compound. Edges, fittings, and hardware shall be finished free from burrs and sharp edges. Cable trays shall include splice and end plates, dropouts, and miscellaneous hardware.

2.3 SUPPORTS

2.3.1 Supports and hangers shall permit both vertical and horizontal adjustment, where possible. Horizontal and vertical tray supports shall provide an adequate bearing surface for the tray and shall have provisions for holddown clamps or fasteners. Vertical tray supports shall provide a secure means other than friction for fastening cable trays to supports.

2.3.2 Cable trays shall be supported at not more than 6 foot intervals. Supports for horizontal-elbow tray fittings shall be placed within 2 feet of each fitting extremity and as recommended by the cable-tray manufacturer.

2.3.3 When supported at 6 -foot intervals, the cable trays shall be capable of carrying not less than 150 pounds per linear foot. Tray fittings shall have not less than the load-carrying ability of straight tray sections and shall have the manufacturer's minimum standard radius.

PART 3 EXECUTION

3.1 MANUFACTURER'S INSTRUCTIONS

3.1.1 Manufacturer's instructions shall be submitted for Cable Trays including special provisions required to install equipment components and system packages. Special notices shall detail impedances, hazards and safety precautions.

3.2 INSTALLATION DRAWINGS

3.2.1 Thirty calendar days prior to shipment, installation drawings shall be submitted to the Contracting officer for approval. Drawings shall be coordinated with all other work in the immediate area that could come in conflict with the installation. Drawings shall include layout of cable tray work, including details of both horizontal and vertical supports. Both horizontal and vertical supports shall be as specified in paragraph entitled, "Supports," of this section.

3.3 GROUNDING

3.3.1 Cable trays shall be properly grounded by means of a low-resistance conductor of sufficient capacity, but in no case smaller than No. 1/0 AWG copper. Grounding conductor shall be bonded to cable-tray sections and fittings by compatible bolted connections. Effective grounding shall be permanent and continuous with an impedance sufficiently low to limit the potential above ground and to facilitate operation of over current devices in the circuit. Grounding and bonding cable trays shall be in accordance with NFPA 70.

END OF SECTION 27 05 28.36 40

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27 05 28.36 40-1 03/16/10