Galvanized cable trays without grounding

Galvanized cable trays must be grounded; they do not bypass grounding requirements.Key Points on GroundingAll metallic cable trays, including galvanized steel, must be grounded to ensure electrical safety, even if the tray itself is not used as an equipment grounding conductor (EGC) for the circuits it supports . Grounding prevents electric shock, equipment damage, and ensures proper fault current paths.Methods of GroundingSeparate EGC Conductor: A dedicated grounding conductor can be installed inside or attached to the tray. This conductor should meet minimum size requirements per NEC Table 250.122 .Cable Tray as EGC: In some installations, the tray itself can serve as the EGC if it meets cross-sectional area requirements for the specific circuit breaker or fuse rating .Bonding Connections: Each tray section should be bonded to maintain electrical continuity. Grounding clamps, jumper wires, or bolted connections with cleaned metal surfaces are used to ensure low-resistance contact .Spacing and PointsAt least two grounding points are required: one at each end of the tray run.For long runs, additional grounding points are needed every 20–30 meters to maintain continuity .ExceptionsNon-metallic trays, such as polymer, fiberglass, or composite trays, do not require grounding because they are non-conductive . Wire mesh trays are metallic but may have limitations if used as an EGC due to reduced current-carrying capability.SummaryEven though galvanized trays are corrosion-resistant, they are still metallic and must be grounded according to NEC Article 250.96 and other international standards. Grounding ensures safety and compliance, and proper bonding practices are essential for long-term reliability .