IEC TR 63040:2016(E) 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. 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. This document provides results of research related to the following criteria: 1) clearances independent from the micro-environment; 2) 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; 3) creepage distances to avoid flashover of the insulating surface; 4) information on minimum creepage distances to maintain minimum insulation resistance. 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. The contents of the corrigendum of January 2019 have been included in this copy.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\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 |