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The following topics are dealt with: Electric breakdown; gaseous insulation; insulating oil; electric strength; non-tracking organic insulations; silicone glass fiber insulation system; silicone resins; high frequency ceramic dielectric insulation; tubular plastic insulations; corona test specifications; corona discharges; pyroelectric effect; ferroelectric material; wire and cable insulation; dielectric relaxation; polyethylene terephthalate films; dielectric materials; dielectric measurements; dielectric surface failure; and insulation thickness effects.