Translated from the Russian by P. S. IvanovFirst published 1982Revised from the third 1980 Russian editionThe textbook describes the modern methods for determining electrical and nonelectrical characteristics of electrical insulating materials and insulation systems. The chapters present information on specimens for materials and insulation components and preparation of the specimens for testing.The topics also include widespread measuring devices and test units.The book is intended for students of secondary technical schools and may also serve as a manual for specialists engaged in testing of electrical insulating material and insulation products.