Tinning is primarily used to protect metallic cable trays from corrosion, especially in environments with high humidity, chemical exposure, or industrial pollutants. It also improves electrical conductivity for grounding purposes and facilitates soldering connections when attaching components or bonding multiple trays together. This is particularly relevant for metallic trays made of steel or copper.
While tinning is not explicitly required by the NEC, metallic cable trays must comply with grounding, bonding, and corrosion protection standards. Tinned trays can help meet these requirements by providing a durable conductive surface and reducing oxidation over time . Proper tinning ensures that tray-rated cables and grounding connections maintain long-term reliability.
Tinned trays require minimal maintenance but should be inspected periodically for scratches or wear that could expose the underlying metal. Any damaged areas can be re-tinned using brush or spray methods to maintain protection. In summary, tinning enhances the durability, conductivity, and solderability of metallic cable trays, making it a valuable protective measure in harsh or electrically sensitive environments .
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