IEC TR 60664-2-1-2011 PDF

Full title and description

IEC TR 60664-2-1:2011 — Insulation coordination for equipment within low-voltage systems - Part 2-1: Application guide — Explanation of the application of the IEC 60664 series, dimensioning examples and dielectric testing. This technical report provides guidance for technical committees and manufacturers on selecting insulation ratings and verifying dielectric performance for low-voltage equipment; the published copy includes Corrigendum 1 (October 2011).

Abstract

This Technical Report explains the principles of the IEC 60664 series, shows practical dimensioning examples (clearances, creepage distances and impulse voltage values), and describes dielectric testing approaches and relevant decisions to be taken by technical committees or manufacturers. It addresses factors such as nominal or rated insulation voltages, overvoltage category, types and frequency of overvoltages, insulating material characteristics, pollution degree and humidity.

General information

• Status: Current technical report (stable until 2026 / active publication).
• Publication date: 31 January 2011 (Corrigendum 1 circulated October 24, 2011).
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 29.080.30 (Insulation systems).
• Edition / version: Edition 2.0 (2011).
• Number of pages: 132 (full IEC publication; some national/publisher presentations list alternative page counts for derived publications).

Scope

The report is an application guide to assist technical committees and product manufacturers in applying the IEC 60664 series to low-voltage equipment. It clarifies requirements, shows dimensioning procedures and worked examples for insulation coordination (clearances, creepage, impulse voltages), and describes dielectric test methods and the decisions that must be specified by committees or made by manufacturers when designing and verifying products for a range of low-voltage systems. Corrigendum 1 corrections are included in the common IEC copy.

Key topics and requirements

• Principles and application guidance for the IEC 60664 series (parts 1, 3, 4 and 5) including how the parts interrelate.
• Dimensioning examples for clearances and creepage distances, and worked procedures for selecting insulation ratings.
• Determination of rated impulse voltages for various system voltages (including amendments for DC up to 1500 V).
• Consideration factors: nominal/rated voltage, overvoltage category, types and frequency of overvoltages, pollution degree, humidity and material characteristics.
• Recommendations for dielectric testing and verification procedures used to confirm insulation coordination choices.
• Annex overviews listing clauses that require committee decisions or manufacturer options (helpful for standards writers and product specifications).

Typical use and users

Used by standards technical committees, product design and compliance engineers, test laboratories and manufacturers of low-voltage electrical and electronic equipment to define and verify insulation coordination, to create or interpret product specifications, and to prepare type and routine test plans. It is also used by regulatory bodies and certification organizations when assessing dielectric design and testing.

Related standards

Directly related to the IEC 60664 series (notably IEC 60664-1, IEC 60664-3, IEC 60664-4 and IEC 60664-5). Cross-referenced standards and guidance include IEC 60085 (temperature limits), IEC 60112 (CTI / comparative tracking index), IEC 60216 (insulation ageing), IEC 60364-4-44, IEC 61140 and other equipment/product standards that invoke insulation-coordination clauses. National adoptions and derivative publications (for example BSI and VDE national documents) exist that adopt or adapt the report text.

Keywords

Insulation coordination, low-voltage, clearance, creepage, dielectric testing, impulse voltage, overvoltage category, pollution degree, LVDC, rural electrification.

FAQ

Q: What is this standard?

A: It is a Technical Report from IEC (IEC TR 60664-2-1:2011) that serves as an application guide for the IEC 60664 series on insulation coordination for equipment used in low-voltage systems.

Q: What does it cover?

A: It explains how to apply the IEC 60664 series, provides dimensioning examples for clearances and creepage, gives guidance on selecting rated and impulse voltages, and describes dielectric testing approaches; annexes summarize clauses that require committee or manufacturer decisions.

Q: Who typically uses it?

A: Standards committees, product design and compliance engineers, test houses, certification bodies and manufacturers of low-voltage equipment use it to write specifications, design insulation systems and verify dielectric performance.

Q: Is it current or superseded?

A: Edition 2.0 (2011) is the current IEC TR edition with Corrigendum 1 (October 2011) included in the official copy; the IEC webstore lists a stability date of 2026. It replaced the earlier 1997 edition.

Q: Is it part of a series?

A: Yes — it is an application guide for the IEC 60664 series (IEC 60664-1, -3, -4, -5) and is intended to be used alongside those normative parts when specifying insulation coordination.

Q: What are the key keywords?

A: Insulation coordination, low-voltage, LVDC, clearance, creepage, dielectric testing, impulse voltage, overvoltage category, pollution degree.