This document describes test results of research on dimensioning of clearances and creepage distances, for spacing equal to or less than 2 mm for printed wiring material and other equivalent arrangements of insulation, where the clearance and the creepage distance follows the same path along the surface of solid insulation.<\/p>\n
The information contained in this document is the result of research only and cannot be used for dimensioning the clearances and creepage distances for equipment within low-voltage systems, where IEC 60664-1 applies. However distances can be taken into account for functional reasons.<\/p>\n
This document provides results of research related to the following criteria:<\/p>\n
clearances independent from the micro-environment;<\/p>\n<\/li>\n
creepage distances for pollution degree 1, 2 and 3 which extends the use of smaller distances to products having design features similar to printed circuit boards;<\/p>\n<\/li>\n
creepage distances to avoid flashover of the insulating surface;<\/p>\n<\/li>\n
information on minimum creepage distances to maintain minimum insulation resistance.<\/p>\n<\/li>\n<\/ol>\n
A test method for the evaluation of the relevant water adsorption group for the surface of any insulating material which has not yet been classified is described.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 2<\/td>\n | National foreword <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 4 Fundamental aspects and phenomena of clearance and creepage distances 4.1 Mutual correlation of insulation characteristics with regard to environmental conditions 4.2 Pollution 4.2.1 General <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.2.2 Humidity level (HL) 4.2.3 Relation of humidity levels to macro-environment Tables Table 1 \u2013 Relation of the humidity levels to macro-environments <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.2.4 Comparative tracking index (CTI) 4.2.5 Flashover characteristics <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5 Clearances and creepage distances 5.1 General 5.2 Clearances 5.2.1 Influencing criteria <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Table 2 \u2013 Clearances for mutual correlation of insulation characteristics to withstand transient overvoltages <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5.2.2 Altitude Figures Figure 1 \u2013 Clearances in air for mutual correlation of insulation characteristics to withstand transient overvoltages up to 2\u200a000 m above sea level <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Table 3 \u2013 Clearances to withstand steady-state voltages, temporary overvoltages or recurring peak voltages <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.3 Creepage distances 5.3.1 General 5.3.2 Influencing factors <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Table 4 \u2013 Creepage distances for mutual correlation of insulation characteristics in equipment to avoid failure due to tracking <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 2 \u2013 Creepage distances for mutual correlation of insulation characteristics to avoid failure due to tracking <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Table 5 \u2013 Creepage distances for mutual correlation of insulation characteristics to avoid flashover <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure 3 \u2013 Creepage distances for mutual correlation of insulation characteristics to avoid flashover <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 5.3.3 Dimensioning of creepage distances of functional insulation 6 Additional information regarding creepage distance characteristics \u2013 surface current over a creepage distance (minimum insulation resistance) Table 6 \u2013 Minimum insulation resistance <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Table 7 \u2013 Creepage distances to maintain minimum insulation resistance (without condensation) <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 7 Water adsorption test 7.1 Object 7.2 Withstand characteristics of creepage distances under high humidity Figure 4 \u2013 Creepage distances required to maintain minimum insulation resistance <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 7.3 Recommended test method 7.3.1 Test specimen 7.3.2 Measurement of the impulse withstand voltage 7.3.3 Procedure for characterization of the insulating materials <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 7.4 Definitions of the water adsorption groups <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Figure 5 \u2013 Layout of the test specimen Figure 6 \u2013 Test circuit <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | 8 Dimensioning diagrams Figure 7 \u2013 Critical relative humidity of insulating materials <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Figure 8 \u2013 Diagram for dimensioning of clearances \u2264 2 mm for circuits directly connected to the supply mains (for low-voltage equipment up to 2 000 m) <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure 9 \u2013 Diagram for dimensioning of clearances \u2264 2 mm for circuits not directly connected to the supply mains (for low-voltage equipment up to 2 000 m) <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Figure 10 \u2013 Diagram for dimensioning of creepage distances \u2264 2 mm (for low-voltage equipment up to 2 000 m) <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | 9 Withstand voltage test for creepage distance under humidity conditions Figure 11 \u2013 Withstand voltage test for creepage distance under humidity conditions <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Guidance on clearances and creepage distances in particular for distances equal to or less than 2 mm. Test results of research on influencing parameters<\/b><\/p>\n |