This master should be used by designers working on Port of Portland construction projects and by designers working for PDX tenants (“Tenants”). Usage notes highlight a few specific editing choices, however the entire section should be evaluated and edited to fit specific project needs.
SECTION 260536 - CABLE TRAYS FOR ELECTRICAL SYSTEMS
PART 1 - GENERAL
1.1 DESCRIPTION
- This section describes a cable tray system.
1.2 SUBMITTALS
- Submit product data and shop drawings for cable trays and accessories.
PART 2 - PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
- B-line, or equal.
2.2 CENTER-SUPPORTED LADDER TRAY
- Construct ladder trays using a center rectangular aluminum tube which forms a spine to which cross rungs are attached on 3inch centers. The cross rungs shall be bent up at their ends to a height of 4 inches to form a center-supported, open-sided, ladder-like assembly. Side rails will not be permitted.
- The trays shall be 12 or 24 inches wide as indicated on the drawings.
- Ladder trays shall be constructed of 6063T6 aluminum alloy and shall be designed to support a load of 50 pounds per linear foot when supported on 12-foot centers.
- Cross rungs shall be fastened at right angles to the top of the spine with the rungs bent upward at the outer ends to hold the cables in the tray.
- All edges of cable trays, fittings, and connectors shall be rounded and smooth to prevent injury to cable during its installation.
- Accessories:
- Splicing plates and connectors shall be the same size as the connecting tray.
- Splice connectors shall be two-bolt, rectangular splice connectors which telescope into the spine of the tray. Splice connectors shall allow for thermal expansion/contraction of the tray system. The splice connectors shall be provided with a vertical hole to accept a 1/2inch threaded rod which is used to support the tray in an overhead application.
- Support rods shall be threaded and 1/2 inch in diameter.
- Furnish and install stiffeners and sway braces as required for eccentric loading.
PART 3 - EXECUTION
3.1 CABLE TRAY SYSTEM
- The cable tray system shall be supported from the utility tunnel ceiling at 12-foot maximum intervals or as indicated on the drawings. Place supports for tray fittings within 2feet of each fitting extremity.
- Use splice connectors to join sections of tray.
- Install sway support brackets as required.
- Keep cable trays free of all materials except the conductors which they are intended to support.
- Bond and effectively ground all metal sections of the cable tray system.
END OF SECTION 260536
2/4/2016 / CABLE TRAYS FOR ELECTRICAL SYSTEMSS:\MASTERS\DIV-26\260536MT.DOCS:\MASTERS\DIV-26\260536MT.DOC / 260536-1