What type of materials should raceways, cable trays, and boxes be made from?

Raceways, cable trays, and boxes should be constructed from materials that are appropriate for the specific environment in which they are installed. This is crucial because these installations may be exposed to varying conditions such as moisture, chemicals, extreme temperatures, or physical impact depending on the location (indoor, outdoor, industrial, residential, etc.). Selecting materials that match the environmental requirements ensures safety, reliability, and longevity of the electrical installation.

For example, in outdoor or industrial settings where moisture or corrosive substances are present, materials like PVC, stainless steel, or galvanized steel may be more suitable compared to standard plastic or painted metals that might degrade or corrode under those conditions. Thus, a key principle in electrical installation is to use materials that will withstand the specific challenges of their intended environment. This adherence to environmental suitability is critical in maintaining the integrity of the electrical system and reducing risks of failures or hazards.