GB/T 16935.4-2011
Insulation coordination for equipment within low-voltage systems.Part 4: Consideration of high-frequency voltage stress (English Version)

Standard No.

GB/T 16935.4-2011

Language

Chinese, Available in English version

Release Date

2011

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 16935.4-2011

Scope

This part of GB/T 16935 stipulates the requirements for electrical clearances, creepage distances and solid insulation of electrical equipment according to the performance standards of electrical equipment. This standard contains electrical test methods for insulation coordination. The values for minimum electrical clearances specified in this standard do not apply in the presence of ionized gases, for which special requirements will be specified by the relevant technical committee. This standard applies to basic insulation, supplementary insulation and reinforced insulation that withstand high-frequency voltage stresses in low-voltage equipment. Insulation dimensional data in this part of the standard applies directly to basic insulation; for reinforced insulation, the additional requirements given in IEC 60664-1 apply. Electric clearances under voltage application conditions; determination of creepage distances and solid insulation dimensions. This section should be used in conjunction with IEC 60664-1 or IEC 60664-5. Through the combined use of the above three standards, the voltage frequency limit of IEC 60664-1 and IEC 60664-5 can be increased to above 30 kHz. This section also applies to IEC 60664-3 and to type 1 protection when the voltage frequency exceeds 30 kHz. Protection for Type 2 is still under consideration. This section applies to electrical equipment used in an environment where the altitude does not exceed 2 000 m and the rated voltage does not exceed AC 1 000 V. This section does not apply to the following occasions: — in a liquid environment; — in an environment other than air; — in compressed air. This standard is intended to provide guidance to technical committees responsible for various electrical equipment standards in order to coordinate the relevant requirements of each equipment, so that the purpose of insulation coordination can be achieved when specifying electrical clearances in air; creepage distances and solid insulation.

GB/T 16935.4-2011 Referenced Document

• IEC 60112:2003 Method for the determination of the proof and the comparative tracking indices of solid insulating materials
• IEC 60664-1:1992 Insulation coordination for equipment within low-voltage systems; part 1: principles, requirements and tests
• 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

GB/T 16935.4-2011 history

• 2011 GB/T 16935.4-2011 Insulation coordination for equipment within low-voltage systems.Part 4: Consideration of high-frequency voltage stress

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