Cable tray funnel tee specifications and dimensions

Cable tray funnel tees are fabricated in standard widths of 50–900 mm, with depths and radii tailored to cable load and tray type, available in equal or unequal configurations.

Standard Widths and Depths

Cable tray tees are typically available in widths ranging from 50 mm to 900 mm for light, medium, and heavy-duty systems, with depths (side rail heights) varying according to cable load and tray type . Standard ladder or ventilated trays often have side rail heights of 66 mm, 90 mm, 128 mm, 137 mm, and 175 mm, while straight tray sections are supplied in standard lengths of 3 m, 6 m, 9.1 m, and 12.2 m .

Equal and Unequal Tees

Tees can be equal or unequal, depending on the branch and main tray widths. When ordering or fabricating, the dimensions are typically specified as W1 x W2 x W3, where W1 and W2 are the widths of the main and branch trays, and W3 is the depth or height of the tee . Equal tees have all branches of the same width, while unequal tees allow different branch widths to accommodate varying cable volumes.

Radii and Tangent Lengths

Funnel tees are designed with a minimum tangent of 3 inches and radii that vary depending on the tray size, commonly 305 mm, 610 mm, 915 mm, and 1220 mm for aluminum trays, or 12–48 inches for steel trays . These radii ensure smooth cable transitions and prevent sharp bends that could damage cables.

Material and Finish

Fabrication materials include mild steel (pre-galvanized or hot-dip galvanized) and stainless steel grade 316L, with options for closed or ventilated covers . Aluminum trays are often made from 6063-T5 extruded alloy, with accessories from 5052-H34 aluminum .

Load and Safety Considerations

Rungs in tees must support the cable load with a safety factor of 1.5 and withstand a 200 lb concentrated load when tested according to NEMA VE 1 standards . Rung spacing is typically 225 mm, with a minimum cable bearing surface of 7/8 inch and radiused edges to prevent cable damage.

Summary

When fabricating or specifying a cable tray funnel tee:

• Widths: 50–900 mm
• Depths/Side Rail Heights: 66–175 mm (depending on tray type)
• Radii: 305–1220 mm (aluminum) or 12–48 inches (steel)
• Tangent: Minimum 3 inches
• Configuration: Equal or unequal tees
• Material: Mild steel (PG/HDG) or stainless steel 316L, aluminum alloys for lightweight trays
• Load: Rungs designed for 200 lb concentrated load with safety factor 1.5 These dimensions ensure proper cable support, smooth transitions, and compliance with industry standards for both electrical and mechanical performance .