Pre-branched cables are multi-conductor tray cables designed for direct installation in cable trays, raceways, or supported by messenger wires, simplifying distribution to multiple devices.

Overview

Pre-branched cables are a specialized type of tray cable (TC) engineered for use in cable tray systems. Unlike standard electrical cables, they come with pre-terminated branches that allow direct connection to equipment or devices without additional splicing, reducing installation time and improving reliability . These cables are particularly useful in industrial and commercial environments where multiple power or control points need to be served from a main cable tray run.

Key Features

• Multi-conductor design: Includes multiple insulated conductors, often with grounding conductors, under a protective jacket .
• Direct tray installation: Rated for installation in cable trays, raceways, and channels, including hazardous locations if appropriately rated .
• Exposed Run (TC-ER) capability: Certain types can extend up to six feet outside the tray without continuous support, provided they are secured and protected from physical damage .
• Compliance: Must meet UL listing and NEC requirements (NFPA 70, Section 392.10) for flammability, mechanical resistance, and temperature limitations .

Advantages

• Simplified installation: Pre-branched points eliminate the need for field splicing, reducing labor and potential errors.
• Improved safety: Factory-assembled branches ensure consistent insulation and mechanical protection.
• Flexibility: Can be used in both horizontal and vertical tray runs, with supports at branch points to prevent stress on the cable .
• Compatibility: Works with various cable tray types, including ladder, perforated, solid-bottom, and channel trays, depending on the application and cable size .

Installation Considerations

• Support and fastening: Branches should be secured to tray rungs or transverse members to prevent strain.
• Environmental suitability: Select cables rated for indoor, outdoor, corrosive, or high electrical noise environments as required .
• Spacing and bend radius: Maintain proper bend radius at branch points and ensure adequate spacing to avoid overheating or mechanical damage .

Applications

Pre-branched cables are ideal for:

• Power distribution to multiple machines or panels in industrial plants.
• Control and instrumentation wiring in commercial buildings.
• Situations requiring rapid deployment with minimal field labor. By using pre-branched cables, engineers and installers can achieve efficient, code-compliant, and reliable cable tray installations while reducing installation complexity and potential errors .