Do low-voltage hot-dip galvanized cable trays need to be grounded

Yes, all metallic cable trays, including low-voltage hot-dip galvanized trays, must be grounded to ensure electrical safety and compliance with the NEC.NEC RequirementsAccording to NEC Article 392.60 and Article 250.96, metallic cable trays that support electrical conductors are required to be grounded, regardless of whether the tray itself is used as an equipment grounding conductor (EGC) or not . Grounding ensures that any fault current is safely conducted to the earth, minimizing the risk of electric shock or fire.Grounding MethodsThere are several acceptable methods for grounding cable trays:Using the cable tray as the EGC: The tray can serve as the grounding path if it meets NEC criteria, including electrical continuity and UL classification .Separate EGC conductor in the tray: A single insulated or bare conductor sized according to NEC Table 250.122 can be installed in the tray to bond all sections together .Individual EGCs in each cable: Each multi-conductor cable may include its own EGC, which can be bonded to the tray sections for added safety .Bonding ConsiderationsAll tray sections must be electrically continuous, which is typically achieved through bolting, splice plates, or bonding jumpers .For galvanized trays, use tin- or zinc-plated connectors when bonding to avoid corrosion and maintain a reliable electrical connection .Avoid bare copper in aluminum trays in moist environments due to galvanic corrosion, but hot-dip galvanized steel is generally compatible with copper bonding if proper connectors are used .Special Notes for Low-Voltage SystemsFor signal, communication, or low-energy circuits, grounding is still recommended to protect against lightning, EMI, and voltage disturbances, even if power grounding per NEC Section 318-7 is not strictly required .Proper grounding and bonding improve system reliability and reduce the risk of electrical interference or equipment damage.SummaryAll metallic cable trays, including low-voltage hot-dip galvanized trays, must be grounded. Grounding can be achieved by using the tray as the EGC, installing a separate EGC conductor, or bonding individual cable EGCs. Proper bonding, corrosion-resistant connectors, and electrical continuity are essential to ensure safety, compliance, and long-term reliability .