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

  1. This section describes a cable tray system.

1.2  SUBMITTALS

  1. Submit product data and shop drawings for cable trays and accessories.

PART 2 - PRODUCTS

2.1  ACCEPTABLE MANUFACTURERS

  1. B-line, or equal.

2.2  CENTER-SUPPORTED LADDER TRAY

  1. 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.
  2. The trays shall be 12 or 24 inches wide as indicated on the drawings.
  3. 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.
  4. 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.
  5. All edges of cable trays, fittings, and connectors shall be rounded and smooth to prevent injury to cable during its installation.
  6. Accessories:
  7. Splicing plates and connectors shall be the same size as the connecting tray.
  8. 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.
  9. Support rods shall be threaded and 1/2 inch in diameter.
  10. Furnish and install stiffeners and sway braces as required for eccentric loading.

PART 3 - EXECUTION

3.1  CABLE TRAY SYSTEM

  1. 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.
  2. Use splice connectors to join sections of tray.
  3. Install sway support brackets as required.
  4. Keep cable trays free of all materials except the conductors which they are intended to support.
  5. Bond and effectively ground all metal sections of the cable tray system.

END OF SECTION 260536

2/4/2016 / CABLE TRAYS FOR ELECTRICAL SYSTEMS
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