Standard dimensions for cable tray tee openings

Cable tray tees are designed to match the standard widths and depths of the main cable tray, typically ranging from 50mm to 900mm in width and 25mm to 150mm in depth.

Standard Dimensions

Cable tray tees are fittings that branch a main tray into two directions, so their dimensions correspond to the main tray they connect to. Standard cable tray widths generally range from 50mm to 900mm, while tray depths (or heights) range from 25mm to 150mm, depending on cable volume and ventilation requirements. The length of a tee fitting is usually designed to accommodate the intersection and provide sufficient support for cables, often matching the modular lengths of the main tray, which are commonly 3 meters (10 feet).

Material and Thickness

Cable tray tees are manufactured from mild steel, stainless steel, or aluminum alloys, with thicknesses varying according to load requirements and duty class. For heavy-duty applications, side rails are reinforced, and thickness may exceed 2. 5mm to support larger cable loads.

Galvanized or coated finishes are used to prevent corrosion and ensure long-term durability.

Practical Considerations

Width Matching: The tee must match the width of the main tray to maintain proper cable support and fill ratio.

Depth/

Height: Ensure the tee depth is consistent with the main tray to prevent cable congestion and maintain ventilation. Fill Ratio: NEC guidelines recommend filling trays to 40% of their cross-sectional area for safe cable installation. Compatibility: Tees are available for ladder, perforated, and wire mesh trays, and the choice depends on cable type and installation environment.

In summary, when selecting a cable tray tee, choose a fitting that matches the width, depth, and material of the main tray, typically within the standard ranges of 50–900mm width and 25–150mm depth, while considering load, ventilation, and future expansion requirements.