Calcium silicate bonded with sodium silicate. Although it is popularly considered an asbestos substitute, early uses of calcium silicate for insulation still made use of asbestos fibers. It is used in passive fire protection and fireproofing as calcium silicate brick or in roof tiles. It is one of the most successful materials in fireproofing in Europe because of regulations and fire safety guidelines for commercial and residential building codes (see Calcium Silicate use in Europe). Where North Americans use spray fireproofing plasters, Europeans are more likely to use cladding made of calcium silicate. High-performance calcium-silicate boards retain their excellent dimensional stability even
Insulation system the more difficult to cool rotor winding may be Class F. There are five categories of insulation used by the three different classes of equipment; functional, basic, supplementary, double and reinforced. Insulation system The electrical insulation system for wires used in generators, electric motors, transformers, and other wire-wound electrical components is divided into different classes by temperature and temperature rise. The electrical insulation system is sometimes referred to as "insulation class" or "thermal classification". The different classes are defined by NEMA, Underwriters Laboratories (UL), and IEC standards. The maximum hot-spot operating temperature is reached by adding the rated ambient temperature