IEC 61557-8-2014 cor1-2016 PDF

Full title and description

IEC 61557-8:2014/COR1:2016 — Corrigendum 1 to IEC 61557-8:2014: "Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. — Equipment for testing, measuring or monitoring of protective measures — Part 8: Insulation monitoring devices for IT systems". This corrigendum updates the published 2014 text (notably corrections to the French title and related editorial items) and is published bilingually in English and French.

Abstract

This document is Corrigendum 1 to IEC 61557-8:2014. It makes editorial corrections to the published 2014 edition of Part 8 (insulation monitoring devices for IT systems), ensuring the bilingual title and related cover/title-page text are correct and bringing minor clarifications into the published text. The corrigendum is intended to be read together with IEC 61557-8:2014 and does not introduce new technical requirements beyond editorial and corrective changes.

General information

• Status: Published (corrigendum to IEC 61557-8:2014).
• Publication date: 18 May 2016 (IEC publication date for Corrigendum 1).
• Publisher: International Electrotechnical Commission (IEC), bilingual English/French edition.
• ICS / categories: 17.220.20; 29.080.01; 29.240.01 (measurement of electrical quantities, electrical insulation, power distribution).
• Edition / version: Edition 3.0 (IEC 61557-8:2014) with Corrigendum 1 issued 2016 (denoted IEC 61557-8:2014/COR1:2016).
• Number of pages: Corrigendum is a short publication (typically 1 page/corrigendum insert in the IEC webstore listing).

Scope

IEC 61557-8 specifies requirements for insulation monitoring devices (IMDs) that permanently monitor the insulation resistance to earth (RF) of unearthed IT a.c. systems (up to 1 000 V a.c.) and IT d.c. systems (up to 1 500 V d.c.), including AC IT systems with galvanically connected DC circuits. The part also addresses related functions, marking, tests (type and routine), and includes normative annexes for specialised applications (medical IMDs and photovoltaic IMDs). The corrigendum updates and corrects editorial items in the published 2014 text and is intended to be used together with the base 2014 edition.

Key topics and requirements

• Definitions, terms and abbreviations specific to insulation monitoring devices for IT systems.
• Mandatory functions: continuous insulation resistance monitoring and a required test/service function to verify IMD operation.
• Optional functions: features such as local/remote transformer monitoring warnings and remote enable/disable command facilities.
• Performance and response requirements: specified response values, response time, internal impedances, measuring voltages/currents and permitted extraneous d.c. voltages.
• Mechanical, environmental and EMC requirements and type/routine test procedures to verify compliance.
• Normative annexes covering medical insulation monitoring devices (MED-IMD) and photovoltaic system IMDs (PV-IMD), plus guidance on insulation monitoring functions embedded in inverters/charge controllers.
• Marking, operating instructions and information required for safe installation and maintenance.

Typical use and users

Engineers and designers of low-voltage IT electrical systems, equipment manufacturers (IMD designers and testers), installation and commissioning personnel, safety inspectors, medical facility electrical engineers, photovoltaic system designers, and utilities involved in unearthed IT system operation and maintenance rely on this part of IEC 61557 for device specification, testing and compliance guidance. The standard is also used as the technical basis for national and regional adoptions (EN, national bodies).

Related standards

IEC 61557 is a multi-part series; related references include IEC 61557-1 (general requirements and definitions for the series) and other parts of IEC 61557 covering protective-measure testing and monitoring (for example cross-references to terminology and functions in IEC 61557-15 in the context of optional functions). European adoptions include EN 61557-8:2015 and related corrigenda / amendment documents. Users should consult the full IEC 61557 series for complementary requirements.

Keywords

Insulation monitoring device, IMD, IT system, unearthed system, insulation resistance, RF, insulation monitoring, IEC 61557-8, corrigendum, PV-IMD, MED-IMD, type test, routine test, EMC, marking, safety.

FAQ

Q: What is this standard?

A: IEC 61557-8:2014/COR1:2016 is Corrigendum 1 to IEC 61557-8:2014, the part of the IEC 61557 series that specifies requirements for insulation monitoring devices used on unearthed IT a.c. and d.c. systems. The corrigendum supplies editorial corrections to the 2014 edition.

Q: What does it cover?

A: It covers functional, performance, mechanical, environmental, EMC and testing requirements for IMDs (permanent monitoring, test functions, alarm/response criteria), plus normative annexes for medical and photovoltaic applications. The corrigendum itself corrects editorial elements of the published 2014 text.

Q: Who typically uses it?

A: Manufacturers of insulation monitoring devices, electrical design engineers, installers and commissioning teams for IT systems, safety inspectors, medical facility engineers and PV system designers. Standards bodies and conformity assessment organizations also reference it when assessing IMD compliance.

Q: Is it current or superseded?

A: IEC 61557-8:2014 remains the normative edition for Part 8; Corrigendum 1 (2016) is an editorial correction to that 2014 edition. The IEC webstore lists the corrigendum as published in May 2016 and provides a stability date for the publication record; users should confirm whether any later amendments or new editions have been released after 2016 before relying on the text for certification or regulatory purposes.

Q: Is it part of a series?

A: Yes — IEC 61557 is a series titled "Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. — Equipment for testing, measuring or monitoring of protective measures." Part 8 is the IMD-specific part; other parts (for example Part 1 and Part 15) provide complementary general requirements and related functional definitions.

Q: What are the key keywords?

A: Insulation monitoring device (IMD), unearthed IT system, insulation resistance (RF), continuous monitoring, test function, medical IMD, photovoltaic IMD, type tests, routine tests, EMC, marking.