Metallic cable trays must be properly grounded regardless of their height. They can serve as the Equipment Grounding Conductor (EGC) if they meet NEC requirements, but all sections should be bonded together using clamps or jumpers to ensure electrical continuity and safety under fault conditions . Bare copper conductors should not be placed in aluminum trays in moist environments due to corrosion risk; insulated conductors with proper bonding connections are recommended . Grounding resistance should ideally be 4 ohms or less to ensure effective fault current diversion .
While cable trays can be installed near the floor, NEC guidelines emphasize that trays must remain accessible for maintenance and should not be placed in areas prone to severe physical damage . A minimum vertical clearance of 12 inches above the tray is recommended for installation and servicing access, even if the tray is low to the ground . Avoid placing trays in hoistways, enclosed spaces, or areas where they could be obstructed.
Low-mounted trays are more susceptible to mechanical damage from foot traffic, equipment, or cleaning operations. Consider using solid-bottom trays or protective barriers to shield cables from impact while maintaining airflow for heat dissipation . Ladder-type trays are preferred for heavy power cables to allow cooling and reduce overheating risks.
Choose tray materials based on environmental conditions: steel, aluminum, or FRP. For outdoor or damp areas, corrosion-resistant materials and sunlight-resistant cables are recommended . Ensure that cable fill limits are respected: 40% for power cables and 50% for control cables to prevent overheating .
Placing a cable tray close to the ground is permissible, but it requires careful attention to grounding, mechanical protection, accessibility, and compliance with NEC Article 392. Proper installation ensures safety, reduces electrical hazards, and maintains long-term system reliability .
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