IEC TR 60664-2-1-2011 cor1-2011 PDF

Full title and description

IEC TR 60664-2-1:2011/COR1:2011 — "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" (Corrigendum 1 incorporated). This technical report provides guidance for application of the IEC 60664 series, illustrative dimensioning examples and information on dielectric/impulse testing relevant to insulation coordination of low-voltage equipment.

Abstract

This technical report (TR) explains the principles of the IEC 60664 series for insulation dimensioning of low-voltage (LV) equipment, gives practical examples for clearances, creepage and dielectric testing, and clarifies options and decisions expected from technical committees and manufacturers. The October 2011 corrigendum (COR1) is included in the published copy.

General information

• Status: Technical Report with Corrigendum 1 (active / published copy includes COR1:2011).
• Publication date: Original TR published 31 January 2011; Corrigendum 1 published 24 October 2011.
• Publisher: International Electrotechnical Commission (IEC), TC 109 (Insulation co‑ordination for low‑voltage equipment).
• ICS / categories: 29.080.30 (Insulation systems).
• Edition / version: Edition 2.0 (2011) with Corrigendum 1 incorporated (2011).
• Number of pages: Approximately 68 pages (published TR document).

Scope

The TR serves as an application guide for technical committees and manufacturers applying the IEC 60664 series. It addresses factors relevant to insulation coordination and dimensioning in LV equipment design including nominal and rated insulation voltages, overvoltage categories, frequency and types of overvoltages, properties of insulating materials, pollution degrees and humidity, and dielectric/impulse testing practices. Annexes summarize clauses of IEC 60664 parts that require committee decisions or manufacturer options, and extend rated impulse voltage tables for certain DC voltages.

Key topics and requirements

• Explanation of the IEC 60664 series principles for insulation dimensioning (clearance, creepage, surge/impulse withstand).
• Dimensioning examples illustrating selection of clearances/creepage for LV equipment and combinations of voltages and pollution degrees.
• Guidance on dielectric and impulse testing procedures and interpretation for design verification.
• Summaries (annexes) of clauses in IEC 60664-1, -3, -4, -5 that require specification, options or manufacturer action.
• Corrigendum adjustments (COR1) incorporated into the published TR to correct/clarify text and tables.

Typical use and users

Used by standards committees, product design and R&D engineers, safety/qualification teams, test laboratories and manufacturers of low-voltage electrical equipment to interpret and apply insulation‑coordination principles, select appropriate clearances/creepage, define test regimes, and resolve options left to technical committees or suppliers. Also referenced in national adoptions and guidance documents.

Related standards

Part of the IEC 60664 series. Key related documents include IEC 60664-1 (Principles, requirements and tests) and other parts of the series (e.g., IEC 60664-3, -4, -5). National or regional adoptions and companion documents (for example national translations/adoptions and product‑specific standards) reference this TR for application guidance.

Keywords

insulation coordination, low-voltage equipment, IEC 60664, application guide, clearances, creepage, dielectric testing, impulse voltage, overvoltage category, pollution degree, COR1, corrigendum.

FAQ

Q: What is this standard?

A: It is IEC TR 60664-2-1:2011 with Corrigendum 1 (2011) — a technical report that provides an application guide and explanatory material for the IEC 60664 series on insulation coordination for low‑voltage systems.

Q: What does it cover?

A: The TR explains how to apply the IEC 60664 series in practice, gives dimensioning examples for clearances and creepage, describes dielectric and impulse testing considerations, and identifies clauses where committees or manufacturers must make specifications or choices (annex summaries included).

Q: Who typically uses it?

A: Standards committees, product designers, test laboratories, safety engineers and manufacturers of LV equipment use the TR to ensure consistent application of insulation‑coordination principles and to support product specification and testing.

Q: Is it current or superseded?

A: The TR plus its Corrigendum 1 was published in 2011; the published copy incorporates COR1 (24 Oct 2011). The IEC webstore shows the published TR with a stability indicator (document stability through 2026), so it is the published authoritative TR copy; users should check IEC or national bodies for any later revisions or replacements after 2026.

Q: Is it part of a series?

A: Yes — it is an application guide within the IEC 60664 series (which includes IEC 60664-1 and other part documents referenced throughout the TR).

Q: What are the key keywords?

A: Insulation coordination; low‑voltage; clearances; creepage; dielectric test; impulse voltage; overvoltage category; pollution degree; IEC 60664; application guide; COR1.