1 Scope and object7 2 Normative references 7 3 Terms and definitions 9 4 Basis for insulation coordination 14 41 General 14 42 Insulation coordination with regard to voltage14 421 General 14 422 Insulation coordination with regard to long-term ac or dc voltages 15 423 Insulation coordination with regard to transient overvoltage15 424 Insulation coordination with regard to recurring peak voltage15 425 Insulation coordination with regard to temporary overvoltage15 426 Insulation coordination with regard to environmental conditions16 43 Voltages and voltage ratings 16 431 General 16 432 Determination of voltage for long-term stresses 16 433 Determination of rated impulse voltage17 434 Determination of recurring peak voltage 19 435 Determination of temporary overvoltage 19 44 Frequency 20 45 Time under voltage stress
