Which type of raceway is not suitable for areas with a risk of severe damage?

Electrical metallic tubing (EMT) is not suitable for areas with a risk of severe damage because it is designed primarily for indoor use and is more susceptible to physical impact compared to other options. EMT, while it offers good protection against moisture and some physical damage, does not provide the same level of durability as rigid conduits.

In environments prone to harsh conditions or physical abuse, more robust options like rigid PVC conduit, which is both impact-resistant and lightweight, or non-metallic flexible conduit, which can absorb impacts better, would be preferred. Wooden cable raceways, while not typically recommended in contexts requiring resilience, can also offer more protection than EMT in specific applications, depending on their construction and the environment they are used in.