Dimensions of Trough-Type Cable Tray Accessories

Trough-type (perforated) cable tray accessories are designed to match standard tray widths and depths, typically ranging from 50 mm to 300 mm in height, with widths from 100 mm to 600 mm, ensuring compatibility and proper cable support.

Standard Dimensions

Trough-type cable trays provide continuous bottom support with ventilation openings, and their accessories—such as elbows, tees, reducers, and drop-outs—are manufactured to align with the tray's nominal width and depth. Typical side rail heights for these trays and accessories range from 50 mm, 70 mm, 100 mm, to 120 mm, depending on the load and cable type . Standard widths generally span 100 mm to 600 mm, while lengths of straight sections are commonly 2 to 3 meters, allowing modular installation .

Material Thickness and Load Considerations

The material thickness of both trays and accessories affects load capacity, allowable span, and long-term durability. Accessories are designed to maintain structural integrity under the same load conditions as the main tray. For example, a trough accessory with a 70 mm side rail height and standard thickness can support typical power and communication cables without excessive deflection .

Accessory Types and Dimensions

• Elbows (horizontal/vertical): Match the tray width and side rail height; radius is typically 1.5 to 2 times the tray width for smooth cable routing .
• Tees and Crosses: Designed to intersect trays of equal or compatible widths; side rail heights remain consistent with the main tray .
• Reducers: Allow transition between different tray widths; accessory height is adjusted proportionally to maintain cable support .
• Drop-outs and Supports: Maintain the same width and side rail height as the tray to ensure proper cable guidance and load distribution .

Design and Compliance

Trough-type accessories are manufactured to comply with NEC, NEMA, and IEC standards, ensuring proper cable fill, ventilation, and mechanical support. When selecting accessories, it is recommended to verify manufacturer load tables and confirm that the accessory dimensions match the tray system to prevent overcrowding or structural failure . In summary, trough-type cable tray accessories are dimensioned to match the tray's width, depth, and side rail height, with standard heights from 50 mm to 120 mm and widths from 100 mm to 600 mm, ensuring compatibility, structural integrity, and compliance with electrical codes.