Intumescent, electrical installation systems which comprise an injection molding material of polyolefins or polyimides in combination with intumescent additives, the melting points of the polyolefins and of the polyimides being lower than the intumescence temperature of the intumescent additives. Other polymers can be used as second polymer including polymers comprising modified naphthol side groups. Forming a base contiguous with a portion of the collector.