Cable tray BOQ measurement involves calculating the total length of trays, number of supports, fittings, and accessories based on tray type, size, and installation standards.

Key Components of a Cable Tray BOQ

1. Cable Tray Lengths Measure the total linear length of each type of tray (ladder, perforated, or solid-bottom) including straight runs, elbows, tees, and reducers. Each section should be measured separately to account for variations in size and orientation .
2. Supports and Hangers Calculate the number of supports using the formula: Support Quantity = Total Length ÷ Support Spacing + 1 For example, a 20-meter tray with 2-meter spacing requires 11 supports. Support spacing depends on tray type, load, and installation standards, typically ranging from 1.5 to 3 meters .
3. Fittings and Accessories Include elbows, tees, reducers, couplers, and end caps. Each fitting should be counted individually based on the design layout. Accessories like clamps, brackets, and fasteners must also be included in the BOQ .
4. Tray Sizing and Cable Fill Determine tray width and depth based on the number and type of cables, ensuring compliance with IEC 61537 and NEC 392 standards. Proper sizing prevents overcrowding, overheating, and allows for future expansion. Use cable datasheets to calculate the actual cross-sectional area and compare it with the tray's allowable fill .
5. Material Specifications Specify tray material (steel, aluminum, or fiberglass), galvanization, and thickness. Include certificates and type test documentation as required for procurement .

Tools and Software for BOQ Generation

• Bentley Raceway and Cable Management allows 3D modeling of cable trays, routing, and automatic generation of BOQs, cable pull cards, and schedules. It supports steel and aluminum ladder trays and integrates with project design files .
• Cable Tray Sizing Calculators help convert cable schedules into verified tray widths and fill percentages, ensuring accurate BOQ preparation .

Steps to Prepare a Cable Tray BOQ

1. Review the project layout and cable schedule.
2. Identify tray types, sizes, and materials.
3. Measure all tray runs, including straight sections and fittings.
4. Calculate support quantities based on spacing standards.
5. Include all accessories and fittings.
6. Verify tray fill and sizing against standards.
7. Compile the quantities into a structured BOQ for procurement and cost estimation. By following these steps, engineers can produce an accurate and comprehensive cable tray BOQ that ensures proper material planning, compliance with standards, and efficient installation.