Standard dimensions of horizontal tees for cable trays

Horizontal tees for cable trays are available in equal, reducing, and expanding types, with widths ranging from 50mm to 900mm and side rail flanges sized according to NEMA class.

Types of Horizontal Tees

• Standard (Equal) Tee: All three branches have the same width (W1 = W2) for uniform cable distribution .
• Reducing Tee: One branch is narrower than the main run (W1 > W2), used to transition to smaller cable trays .
• Expanding Tee: One branch is wider than the main run (W1 < W2), used to branch into larger trays .

Width Ranges

Horizontal tees are manufactured to accommodate tray widths from 50mm up to 900mm, suitable for light, medium, and heavy-duty cable tray systems .

Side Rail Flanges and Standards

• Class 1: Compatible with NEMA Classes 12B and 12C, featuring 1 1/8" wide side rail flanges and 4-hole splice plates .
• Class 2: Compatible with NEMA Classes 20A, 20B, and 20C, with 2" wide side rail flanges and 4-hole splice plates .
• Class 3: For NEMA Classes exceeding 20C, with 2 3/8" wide side rail flanges and 8-hole splice plates .

Materials and Finishes

Horizontal tees are available in mild steel (pre-galvanized or hot-dip galvanized) and stainless steel grade 1.4404 (316L). Covers can be closed or ventilated depending on the installation requirements .

Additional Considerations

• Radii and angles: Some manufacturers offer tees with radii of 305mm, 610mm, 915mm, and 1220mm, and angles of 30°, 45°, 60°, and 90° for smooth cable routing .
• Height: Typical side heights range from 50mm to 120mm, matching the straight tray sections .
• Custom sizing: Non-standard widths and lengths can often be requested to fit specific installation needs . These dimensions ensure that horizontal tees can be integrated seamlessly into cable tray systems, maintaining structural integrity and compliance with NEMA or other relevant standards.