IEC 60664-1:2020 Insulation coordination for equipment within low-voltage supply systems–Part 1: Principles, requirements and tests

IEC 60664-1:2020 is the core international standard for insulation coordination of low-voltage electrical equipment (AC ≤1000 V, DC ≤1500 V, frequency ≤30 kHz). It sets out the fundamental principles, defines overvoltage classifications and withstand level criteria, and provides a unified technical framework for insulation design, testing and material selection, serving as the key compliance basis for preventing electric shock and insulation breakdown.

The standard specifies detailed technical requirements and test methods for insulation coordination, including calculation and minimum value rules for clearances and creepage distances, as well as selection and verification requirements for solid insulation, with full consideration of pollution degrees and environmental impacts. It also standardizes insulation withstand test conditions, procedures and acceptance criteria for R&D, production and certification of low-voltage equipment, and aligns with relevant standards for overvoltage and enclosure protection to form a comprehensive insulation safety system.

LISUN supplies the fully test solutions for the following IEC 60664-1:2020, please see the below excel table:

IEC 60664-1:2020 Clause and Subject	LISUN MODEL
4.2.2 Transient overvoltages	SUG335
5.4.3.1 Transient overvoltages	SUG335
4.6.2.3 Partial discharges (PD)	SG61000-5
6.4.6 Partial discharge test
6.7 Measurement of the attenuation of the transient overvoltages
4.6.3 Comparative tracking index (CTI)	TTC-1
4.7.3 Temperature&4.7.5 Humidity	GDJS-015B
5.4.4 Withstand on environmental stresses	GDJS-015B
4.7.4 Vibrations	LVD-100KG
5.3 Dimensioning of creepage distances	CK-1
6.8 Measurement of clearances and creepage distances	CK-1
6.2.2.1 Impulse voltage dielectric test	SUG255
6.4.4 Impulse voltage test	SUG255
6.4.3 Conditioning	GDJS-015B
6.4.3 Conditioning	HLST-500D