A conduit box useful for mounting on an industrial size AC induction motor in a hazardous environment. The conduit box includes a cover and housing, a gasket seal between the cover and housing, and an internal partition wall. The conduit box is made of a cross-linked polymer matrix with a glass fiber content of about 26% by weight, in which the material has thermosetting dimensional stability and formed from a composition of polyesters and vinyl ester. The walls of the conduit box are tapered and the conduit box otherwise composed and constructed to meet requirements of the hazardous environment.