Humidity is one of the most common environmental factors affecting cable trays and the cables they house. The moisture in the air can accelerate corrosion, weaken insulation, and even foster mold growth, all of which can damage the trays and cables. Conduit wiring systems require careful attention to many details to prevent the moisture in the conduits from getting into the electrical equipment enclosures. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned in this technical guide only apply to our own cable management ranges and cannot under any circumstances be transposed to si osure, overheating or. The significance of maintaining moisture-free conditions within electrical cables cannot be overstated, as the presence of water can lead to many risks and damages. Classification and risks of humid environments • High humidity and normal temperature type (such as underground garages, tunnels) : Humidity > 90%, no obvious water accumulation, but the temperature difference between.