Complete Guide to Horizontal Tees for Cable Trays

Horizontal tees are specialized cable tray fittings that create efficient horizontal branches, available in standard, reducing, and expanding configurations for various NEMA classes.Overview of Horizontal TeesHorizontal tees are used to link three straight cable tray sections or compatible transitional fittings, forming a horizontal branch in a cable routing system. They are essential for creating organized pathways in data centers, industrial facilities, and utility installations, allowing cables to branch off from a main run without sharp bends or stress on the cables .Types of Horizontal TeesStandard Tee (HT): All three branches have equal widths (W1 = W2), ideal for uniform cable distribution .Reducing Tee (HTR): The branch width is smaller than the main run (W1 > W2), used when fewer cables need to branch off .Expanding Tee (HTE): The branch width is larger than the main run (W1 < W2), suitable for higher cable volume in the branch .NEMA Class CompatibilityHorizontal tees are designed to match specific NEMA cable tray classes, ensuring proper fit and structural integrity:Class 1: For NEMA Classes 12B and 12C, featuring 1 1/8" side rail flanges and 4-hole splice plates.Class 2: For NEMA Classes 20A, 20B, and 20C, with 2" side rail flanges and 4-hole splice plates.Class 3: For NEMA Classes exceeding 20C, with 2 3/8" side rail flanges and 8-hole splice plates .Material and Finish ConsiderationsHorizontal tees are typically manufactured from mild steel, stainless steel, or aluminum, with finishes such as hot-dip galvanization, epoxy powder coating, or bare metal. Material selection depends on environmental conditions, corrosion resistance requirements, and mechanical load considerations .Installation GuidelinesEnsure the tee aligns with the main cable tray run and any transitional fittings.Use the appropriate splice plates and fasteners according to the NEMA class.Maintain smooth cable bends to prevent stress or damage.Verify load ratings and support spans to comply with mechanical and electrical standards .ApplicationsHorizontal tees are widely used in:Data centers: For branching network and power cables.Industrial plants: To distribute power and control cables efficiently.Telecommunications rooms: For structured cabling and fiber routing .SummaryHorizontal tees are versatile fittings that enable efficient horizontal branching in cable tray systems, available in standard, reducing, and expanding types. Proper selection based on NEMA class, material, and load requirements ensures safe, organized, and durable cable management. For precise specifications and availability, suppliers like Power Utility Products Co provide detailed product codes and fast shipping options .