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. 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. Humid environments (such as underground garages, coastal areas, chemical workshops, sewage treatment plants, tunnels and pipe galleries, etc. Conduit wiring systems require careful attention to many details to prevent the moisture in the conduits from getting into the electrical equipment enclosures.