Panama Cable Tray Support Installation

Proper cable tray support installation ensures safety, reliability, and compliance with electrical standards, using correctly spaced hangers, bonding, and grounding.

Planning and Preparation

Before installation, review the approved shop drawings to determine the layout, tray lengths, and support locations. Inspect all materials, including trays, ladders, fittings, and accessories, for compliance with specifications and damage. Store trays horizontally on a flat surface with timber supports at intervals of one meter, protecting them from moisture and sunlight . Ensure all tools and equipment meet contract requirements and are suitable for the installation task .

Support Types and Positioning

The most common support type is the trapeze or swing support, which uses threaded rods, cross members, and tray clips. Vertical hangers should project through the cross member, with sufficient clearance for tray clips and horizontal adjustment. Cross members must be level, and hex nuts should be adjusted to secure the tray snugly .

Support spacing guidelines:

• Horizontal straight sections: supports should be positioned so that connectors fall between the support point and the quarter-point of the span, avoiding center points or directly on supports .
• Expansion joints: provide expansion connectors at building expansion joints and long outdoor runs at intervals of 30 m (100 ft) or as specified by NEMA VE 2 .
• Bonding: install bonding jumpers at each expansion joint and ground cable trays at least every 15 m (50 ft) and at both ends to maintain electrical continuity .

Installation Procedure

1. Mount supports: Install hangers or trapeze supports at planned locations, ensuring vertical alignment and level cross members .
2. Attach trays: Secure trays to supports using tray clips that allow longitudinal movement for thermal expansion . Clips may be installed inside or outside the tray depending on site conditions .
3. Cable handling: Use tension meters or recording devices for cable pulls, and follow manufacturer recommendations for maximum tension and sidewall pressure. Employ appropriate radius pulling wheels and temporary supports if needed .
4. Clamps and straps: Install UV-resistant cable clamps or straps at intervals of 1800 mm (6 ft) for horizontal runs and 900 mm (3 ft) for vertical runs to limit conductor movement .
5. Inspection: Verify alignment, support integrity, and bonding continuity before energizing the system .

Safety Considerations

• Cable trays are not designed to support personnel; avoid using them as ladders or walkways .
• Ensure all installation personnel are qualified and familiar with electrical hazards and local codes .
• Temporary supports may be required during rigging to prevent damage to structures, equipment, or personnel .

Following these guidelines ensures a safe, durable, and code-compliant cable tray support installation suitable for Panama or similar environments, while maintaining system reliability and ease of maintenance.