Electrical insulating material can be divided into several classes based on the maximum working temperature, which is as follows:
Class Y, the maximum working temperature of 90° C. Included in this class is a fibrous material organic (such as cotton, natural silk, synthetic wool, rayon fiber polyamide, paper, prespan, wood, polyacrylate, polyethylene, polyvinyl, rubber, and so on) that are not dyed in the material varnish or dyes other , It also includes a thermoplastic material that can be soft at low temperatures.
Class A, the working temperature up to 150° CYaitu fibrous material of class Y that has been dipped in varnish asphalt or compound, transformer oils, email mixed with varnish and poliamil or submerged in liquid dielectric (such as insulating fiber on the transformer submerged oil). -material Material is cotton, silk, and paper that have been dyed, including email wire (enamel) were coated oleo-resin and resin-polyamide.
Class E, the maximum working temperature of 120° C. Namely enameled wire insulating material that uses a binder polyvinylformal, polyurethene and epoxy resin and other similar binder with cellulosic materials, pertinaks and tekstolit, triacetate films, polyethylene terephthalate films and fibers.
Class B, the maximum working temperature of 130° C. Namely namely non-organic materials (such as mica, glass, fiber, asbestos) are dyed or glued together with lacquer or compound, and usually heat resistant (with drying oil base, bitumin sirlak, bakelite, and so on).
Class F, maximum working temperature of 155° C. Organic material is not dyed or glued together with epoxy, polyurethane, or high heat-resistant varnish.
Class H, maximum working temperature of 180° C. All the material composition of the base material mica, asbestos and glass fibers are dipped in silicon without a mixture of fibrous material (paper, cotton, and so on). In this class including silicone rubber and wire emails pure polyamide.
Class C, the working temperature above 180° C. Inorganic materials that are not dyed and are not bound by organic substances such as mica, mikanit heat resistant (using an inorganic binder), mikaleks, glass, and ceramic materials. Only one only organic material that belongs to the class C that fluoroetilen polytetrafluorethylene (Teflon).
Figure 2.2 Power Cable