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Cable tray section number

Cable tray section number

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Cable tray section numbers are part of a coding system used to identify specific tray types, sizes, and configurations according to standards like NEMA VE 1 and manufacturer catalogs.

Understanding Cable Tray Section Numbers

Cable tray section numbers are used to specify the type, dimensions, and material of a cable tray section. These numbers help engineers, installers, and suppliers ensure the correct tray is selected for a project. A typical cable tray system includes straight sections, bends, tees, elbows, drop-outs, supports, and accessories, each of which may have a unique section number for identification and ordering purposes .

Components of a Section Number

A cable tray section number often encodes the following information:

  • Tray Type: Ladder, trough, solid bottom, or channel type .
  • Material: Aluminum, steel, or stainless steel, sometimes indicated by a letter code (e.g., "G" for galvanized, "P" for painted), .
  • Dimensions: Width, depth, and length of the tray section, which are critical for load capacity and installation planning .
  • Load Rating or Rung Spacing: Some manufacturers include the rung spacing or load capacity in the part number to ensure compliance with NEMA VE 1 standards . For example, a part number like 156G 09-24-144 may indicate:
  • 156G: Material and finish (e.g., galvanized steel)
  • 09: Tray depth in inches
  • 24: Tray width in inches
  • 144: Tray length in inches Changing a section of the part number, such as from 156G to 156P, can alter the material or finish and affect lead time for delivery .

Standards and Guidelines

Cable tray section numbers are often aligned with NEMA VE 1 standards, which define metallic cable tray systems, including dimensions, load ratings, and testing procedures . Compliance with these standards ensures that the tray can safely support electrical cables without sagging or damage. Manufacturers may also follow ANSI, ASTM, or UL specifications for materials and coatings .

Practical Use

  • Design and Layout: Section numbers allow engineers to plan cable tray layouts accurately, ensuring proper support, separation, and bend radius for cables .
  • Ordering and Inventory: Suppliers use section numbers to manage stock and ensure the correct tray type and size is delivered.
  • Maintenance and Upgrades: Section numbers help identify compatible replacement parts or extensions for existing installations. By understanding cable tray section numbers, professionals can optimize cable management, ensure safety, and maintain compliance with electrical standards.
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