– 2 – 60664-1 © IEC:2007
CONTENTS
1 Scope and object..............................................................................................................7
2 Normative references .......................................................................................................7
3 Terms and definitions .......................................................................................................9
4 Basis for insulation coordination .....................................................................................14
4.1 General .................................................................................................................14
4.2 Insulation coordination with regard to voltage........................................................14
4.2.1 General .....................................................................................................14
4.2.2 Insulation coordination with regard to long-term a.c. or d.c. voltages .........15
4.2.3 Insulation coordination with regard to transient overvoltage.......................15
4.2.4 Insulation coordination with regard to recurring peak voltage.....................15
4.2.5 Insulation coordination with regard to temporary overvoltage.....................15
4.2.6 Insulation coordination with regard to environmental conditions.................16
4.3 Voltages and voltage ratings .................................................................................16
4.3.1 General .....................................................................................................16
4.3.2 Determination of voltage for long-term stresses.........................................16
4.3.3 Determination of rated impulse voltage......................................................17
4.3.4 Determination of recurring peak voltage ....................................................19
4.3.5 Determination of temporary overvoltage ....................................................19
4.4 Frequency .............................................................................................................20
4.5 Time under voltage stress .....................................................................................20
4.6 Pollution................................................................................................................20
4.6.1 General .....................................................................................................20
4.6.2 Degrees of pollution in the micro-environment ...........................................21
4.6.3 Conditions of conductive pollution .............................................................21
4.7 Information supplied with the equipment................................................................21
4.8 Insulating material.................................................................................................21
4.8.1 Comparative tracking index (CTI) ..............................................................21
4.8.2 Electric strength characteristics .................................................................22
4.8.3 Thermal characteristics .............................................................................22
4.8.4 Mechanical and chemical characteristics ...................................................22
5 Requirements and dimensioning rules ............................................................................23
5.1 Dimensioning of clearances...................................................................................23
5.1.1 General .....................................................................................................23
5.1.2 Dimensioning criteria.................................................................................23
5.1.3 Electric field conditions..............................................................................24
5.1.4 Altitude......................................................................................................24
5.1.5 Dimensioning of clearances of functional insulation ...................................24
5.1.6 Dimensioning of clearances of basic, supplementary and reinforced
insulation...................................................................................................
24
5.1.7 Isolating distances.....................................................................................25
5.2 Dimensioning of creepage distances .....................................................................25
5.2.1 General .....................................................................................................25
5.2.2 Influencing factors .....................................................................................25
5.2.3 Dimensioning of creepage distances of functional insulation......................27
5.2.4 Dimensioning of creepage distances of basic, supplementary and
reinforced insulation ..................................................................................
27
5.2.5 Reduction of creepage distances with the use of a rib (ribs) ......................27
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