Abstract: A heavy-duty, non-conductive support system for one or more electrical conduits and the like comprises a substantially uprightly positionable support structure and at least one bracket removably interlockable with the support structure. Both elements of the support system are preferably composed of a polymerized, non-conductive material. The bracket includes a conduit receiving portion and an interlocking portion. The interlocking portion includes two spaced apart fingers disposed in a side by side relationship. The support structure includes a central rib having two sides, each of the sides having finger-receiving slots defined therein.