insulation class on pumps meaning
The ultimate temperature in the winding is the sum of the ambient and the winding temperature rise. For example, if a motor is rated with a 1.15 service factor and has a class B (130 C) insulation system, the temperature rise according to NEMA Stds.l.â on nameplates, insulation class is a standard, industry classification of the thermal endurance of the motor winding. Insulation class is indicated by a letter designation such as A, B, F or H (see Table 2), depending on the windingâs ability to withstand a given operating temperature for a given life.