What must be made of approved materials for installation in concrete or areas with severe corrosive influences?

The requirement for certain materials to be made of approved materials for installation in concrete or areas with severe corrosive influences is grounded in the need for durability and safety. Ferrous metal components are subject to corrosion when exposed to moisture and chemicals commonly found in concrete and corrosive environments. However, when these components are specified as approved materials, it means they must be treated or coated to resist corrosion effectively.

In settings where concrete is present, the conditions can create an aggressive environment that promotes rusting and corrosion, potentially compromising the integrity of the electrical installation. As a result, approved ferrous materials would typically undergo processes such as galvanization or painting to ensure they can withstand these harsh conditions.

In contrast, non-metallic supports might also be used as they are generally resistant to corrosion, but if the question specifically focuses on ferrous components, they would be relevant in terms of compliance with local codes or specific applications. Wooden blocks would generally not be suitable due to their organic nature and susceptibility to decay under moist conditions. Insulated cables, while necessary for safety, relate to the protection of the conductors rather than the structural elements supporting them.

Overall, the emphasis on ferrous metal components that must be approved indicates the importance of selecting materials designed to endure specific environmental