Horizontal tees are fittings that create a horizontal branch in cable tray systems, available in standard, reducing, and expanding types, with specifications varying by NEMA class, flange width, and material.

Types of Horizontal Tees

• Standard Tee: W1 = W2, used to connect three equal-width cable tray sections .
• Reducing Tee: W1 > W2, allows branching from a larger tray to a smaller tray .
• Expanding Tee: W1 < W2, allows branching from a smaller tray to a larger tray .

NEMA Class Compatibility

Horizontal tees are designed to match specific NEMA cable tray classes:

• Class 1: For NEMA 12B and 12C trays, with 1 1/8" wide side rail flanges and 4-hole splice plates .
• Class 2: For NEMA 20A, 20B, 20C trays, 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 .
• Class 4: For heavy-duty 8" high trays (e.g., A820E), with 2 3/4" wide side rail flanges and 8-hole heavy-duty splice plates .

Material and Finish Options

• Mild steel: Pre-galvanized (PG) or hot-dip galvanized (HDG)
• Stainless steel: Grade 1.4404 (316L) for corrosion resistance

Size and Load Considerations

• Widths range from 50 mm to 900 mm for light, medium, and heavy-duty systems .
• Rail heights typically range from 4" to 7", with widths available up to 36" for ladder tray systems .
• Closed or ventilated covers are available for all tees to protect cables and maintain airflow .

Additional Features

• Horizontal tees include splice plates for secure connections.
• Part numbers are often generated based on depth, width dimensions (W1/W2), and finish, e.g., CTUT 25/0300/0150/PG .
• Compatible with both ladder and I-beam tray systems, ensuring flexibility in installation . Horizontal tees are essential for creating efficient horizontal branches in cable tray networks, and selecting the correct type, material, and NEMA class ensures structural integrity and compliance with industry standards.