IEC 60664-5:2007
Insulation coordination for equipment within low-voltage systems - Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2 mm

Standard No.

IEC 60664-5:2007

Release Date

2007

Published By

International Electrotechnical Commission (IEC)

Latest

IEC 60664-5:2007

Replace

IEC 109/61/CDV:2006 IEC 60664-5:2003

Scope

This part of GB/T 16935 specifies the method for determining the dimensions of clearances and creepage distances not exceeding 2 mm in printed circuit boards and similar structures where the clearances and creepage distances are the same and are along the Solid insulating surfaces, as described in Part 1, 6.2 (Examples 1, 5 and 11). This method of sizing is more precise than that specified in Part 1. However, if precise dimensions are not required, the contents of Part 1 may apply. This section can only be used as a whole. It is not allowed to extract one or more clauses from this section, nor to use them in place of the corresponding clauses in Part 1. And this part can only be used in conjunction with part 1. When this Part is used to determine the dimensions of clearances and creepage distances, all clauses shall be applied in place of the corresponding clauses given in Part 1. For electrical and creepage clearances greater than 2 mm and general solid insulation, Part 1 applies. Note 1: The limitation of distances equal to or less than 2 mm applies to basic insulation or supplementary insulation. The total distance of reinforced insulation or double insulation may be greater than 2 mm. This part is dimensioned based on the following criteria: 　——Minimum electrical clearances independent of the microenvironment (see Table 2); 　——Minimum creepage distances applicable to pollution levels 1, 2 and 3 to avoid failure due to tracking (see Table 4); 　——Minimum creepage distance to avoid flashover across the insulation surface (see Table 5). Note 2: The minimum creepage distance to maintain sufficient insulation resistance is shown in Table 82. Note 3: This section does not apply to microenvironmental conditions worse than pollution level 3 or humidity level 3. This standard specifies a test method for assigning unclassified insulating materials to relevant water absorption groups.

IEC 60664-5:2007 Referenced Document

• GB/T 16895.18-2002 Electrical installations of buildings Part 5: Selection and erection of electrical equipment Chapter 51: Common rules
• GB/T 16935.1-2008 Insulation coordination for equipment within low-voltage systems.Part 1:Principles,requirements and tests*， 2008-04-24 Update
• GB/T 17045-2006 Protection against electric shock - Common aspects for installation and equipment
• GB/T 17627.1-1998 High-voltage test techniques for low-voltage equipment. Part 1: Definitions, test and procedure requirements
• GB/T 17627.2-1998 High-voltage test techniques for low voltage equipment Part 2 Measuring system and test equipment
• GB/T 4798.3-2007 Environmental conditions existing in the application of electric and electronic products- Part 3: Stationary use at weather-protected locations*， 2007-07-13 Update
• GB/T 4798.7-2007 Environmental conditions existing in the application of electric and electronic products.Part 7: Portable and non-stationary use*， 2007-07-13 Update
• GB/T 4798.9-1997 Environmental conditions existing in application of electric and electronic products--Microclimates inside products
• IEC 60068 Basic climatic and mechanical robustness testing procedure for components
• IEC 60364-5-51:2005 Electrical installations of buildings - Part 5-51: Selection and erection of electrical equipment - Common rules
• IEC 60664-1:2007 Insulation coordination for equipment within low-voltage systems - Part 1: Principles, requirements and tests
• IEC 60664-4 Insulation coordination for equipment within low-voltage systems - Part 4: Considerations of high-frequency voltage stress
• IEC 60721-3-3:1994 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities; section 3: Stationary use at weatherprotected locations
• IEC 60721-3-7:1995 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 7: Portable and non-stationary use
• IEC 60721-3-9:1993 Classification of environmental conditions; part 3: classification of groups of environmental parameters and their severities; section 9: microclimates inside products

IEC 60664-5:2007 history

• 2007 IEC 60664-5:2007 Insulation coordination for equipment within low-voltage systems - Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2 mm
• 2003 IEC 60664-5:2003 Insulation coordination for equipment within low-voltage systems - Part 5: A comprehensive method for determining clearances and creepage distances equal to or less than 2 mm