American Standard Cable Tray
American Standard cable trays are designed according to NEMA VE 1 and VE 2 standards, with materials and dimensions specified by ASTM and NFPA 70 codes.
Types of Cable Trays
American Standard cable trays are available in several types to suit different applications :
- Ladder Type: Features side rails with rungs spaced 6", 9", or 12" apart; ideal for heavy cable loads and ventilation.
- Trough Type: Solid or ventilated bottom; supports medium loads and provides partial protection.
- Solid Bottom Type: Continuous flat sheet for maximum protection against dust, moisture, or electromagnetic interference.
- Channel Type: Single-piece tray for aesthetic or light-duty applications.
- Wire Mesh (Basket) Type: Lightweight, welded steel wire for light cables and flexible routing.
Materials and Finishes
Cable trays are manufactured using materials selected for strength, corrosion resistance, and environmental suitability :
- Galvanized Steel: Hot-dip or pre-galvanized per ASTM A123 and A653.
- Stainless Steel: AISI 316L for high corrosion resistance, often with molybdenum for enhanced durability.
- Aluminum: Lightweight, corrosion-resistant, often using Aluminum Association alloys.
- Nonmetallic Options: Pultruded fiberglass reinforced polyester or vinyl ester for chemical resistance.
Dimensions and Load Ratings
- Tray Widths: Commonly 6", 9", 12", 18", 24", 30", 36", 42", 48" or as specified on project drawings.
- Tray Depths: Minimum usable load depths of 3", 4", 5", or 6".
- Rung Spacing: Ladder trays typically 6", 9", or 12"; trough trays 5" spacing.
- Fittings: Bends, tees, elbows, and drop-outs must maintain minimum bend radii of 12", 24", 36", or 48" depending on tray size.
- Splice Plates: Bolted type with resistance not exceeding 0.00033 ohms; can be located anywhere within the support span without reducing load capacity.
Standards and Compliance
American Standard cable trays comply with the following :
- NEMA VE 1: Metallic Cable Tray Systems
- NEMA VE 2: Cable Tray Installation Guidelines
- NFPA 70 (NEC): National Electrical Code, Article 392
- ASTM Standards: A123, A653, A1011, A1008, B633 for steel and zinc coatings
- UL Listings: For electrical safety and fire resistance
Installation Considerations
- Maintain minimum bend radius for cables exiting trays.
- Use solid covers where heat buildup or dust protection is required.
- Ensure proper grounding and bonding per Section 26 05 26.
- Verify field dimensions and routing against drawings before installation.
Accessories
Cable tray systems include supports, hangers, splice plates, covers, and grounding components to ensure structural integrity and electrical safety . American Standard cable trays provide a versatile, code-compliant solution for electrical cable management in industrial, commercial, and institutional installations, with options tailored for load, environment, and aesthetic requirements.
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