What type of cable tray is commonly used as an equipment grounding conductor?

Steel cable trays are commonly used as equipment grounding conductors due to their inherent conductive properties and physical durability. When steel is utilized as a tray material, it provides an effective path for grounding and bonding electrical systems. This is crucial for safety in electrical installations, as it helps to prevent electrical shock hazards and equipment damage by ensuring proper grounding.

Steel's robustness also withstands mechanical stresses and environmental factors, making it suitable for various installation locations, including industrial settings. Its conductivity allows it to be directly bonded to the grounding system of an electrical installation, promoting safety and compliance with electrical codes.

In contrast, other materials like plastic and wood do not possess the conductive properties needed for grounding and could potentially create safety issues if used as grounding elements. Aluminum can be used in some contexts but requires special considerations regarding corrosion and bonding. Therefore, steel cable trays are the preferred choice for effectively serving as an equipment grounding conductor.