IEC 61557-2-2019 PDF

Full title and description

St IEC 61557-2-2019 — Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing, measuring or monitoring of protective measures – Part 2: Insulation resistance. This part specifies requirements for portable and bench equipment used to measure insulation resistance of equipment and installations in the de-energized state.

Abstract

IEC 61557-2:2019 defines construction, performance, testing and marking requirements, together with required operating instructions, for insulation-resistance measuring equipment. The 2019 edition is a technical revision of the previous edition (2007) that adds measurement-category requirements, expanded operating-instruction requirements and aligns the structure with the rest of the IEC 61557 series.

General information

• Status: International Standard — current (3rd edition, published 2019) and in force with stated stability date.
• Publication date: 26 July 2019.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 17.220.20, 29.080.01, 29.240.01.
• Edition / version: 3.0 (IEC 61557-2:2019).
• Number of pages: 19 pages (bilingual English/French publication).

Scope

Specifies requirements applicable to equipment for measuring the insulation resistance of electrical equipment and installations when de-energized. The standard covers measuring function performance, construction and overload capability, marking and required operating instructions, tests and verification procedures. It cancels and replaces IEC 61557-2:2007.

Key topics and requirements

• Required measuring functions and ranges for insulation-resistance measurements (typical ranges to cover from 100 kΩ up to tens of MΩ depending on intended use and instrument class).
• Measurement-category and overvoltage-class requirements for measuring circuits (measurement-category assignments to help ensure user safety and proper insulation).
• Construction and overload capability (mechanical, electrical and protection requirements, degree of protection for enclosures, and resistance to extraneous voltages).
• Performance and uncertainty: operating uncertainty, intrinsic uncertainty and influence quantities to be stated and tested in accordance with IEC 61557-1.
• Marking, safety information and expanded operating-instruction requirements (clear instructions, connection diagrams, calibration/recalibration guidance and warnings for voltage tests if present).
• Verification and type/routine tests: type tests and routine production tests for measuring functions, construction and markings.

Typical use and users

Used by manufacturers of insulation-resistance testers, test-laboratory personnel, electrical safety engineers, maintenance technicians and inspection bodies to design, verify, select and use instruments for measuring insulation resistance on de-energized electrical equipment and installations up to the stated voltage limits. Also used by procurement and compliance teams to specify equipment that meets internationally recognized safety and metrological requirements.

Related standards

Part of the IEC 61557 series (see IEC 61557-1 for general requirements). Closely related parts include IEC 61557-1 (general requirements), -3 (loop impedance), -4 (resistance of earth connection and equipotential bonding), -5 (resistance to earth), -6 (effectiveness of RCDs), and other later parts addressing additional measurement functions and specific equipment types. National and regional adoptions (EN IEC versions) and newer parts or amendments in the 61557 series should be checked for jurisdictional application.

Keywords

Insulation resistance; insulation tester; megohmmeter; electrical safety; low-voltage distribution; measuring equipment; de-energized testing; measurement uncertainty; overvoltage category; IEC 61557.

FAQ

Q: What is this standard?

A: IEC 61557-2:2019 is the part of the IEC 61557 series that sets requirements for equipment used to measure insulation resistance of electrical equipment and installations in the de-energized state.

Q: What does it cover?

A: It covers measuring-function performance (ranges and uncertainty), safety and construction requirements, overload capability, markings and operating instructions, and required type and routine tests for insulation-resistance measuring equipment.

Q: Who typically uses it?

A: Manufacturers of insulation testers, calibration and test laboratories, electrical inspectors, maintenance and commissioning technicians, and compliance officers specifying test equipment for low-voltage installations.

Q: Is it current or superseded?

A: IEC 61557-2:2019 is the current (3rd) edition published on 26 July 2019 and it cancels and replaces IEC 61557-2:2007. Users should check for any amendments or newer parts in the IEC 61557 family that may affect application.

Q: Is it part of a series?

A: Yes — it is Part 2 of the IEC 61557 series (Equipment for testing, measuring or monitoring of protective measures) and is intended to be used together with IEC 61557-1 (general requirements) and the other parts in the series that address additional measurement functions.

Q: What are the key keywords?

A: Insulation resistance, insulation tester, megohmmeter, electrical safety, de-energized testing, low-voltage distribution, measurement uncertainty, measurement category, IEC 61557.