IEC 61557-4:2019 PDF

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 4: Resistance of earth connection and equipotential bonding

Название (английский):

IEC 61557-4:2019

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 30
Дата публикации:: 26 июля 2019 г.
Издание:: IEC IS 61557 edition 3 version 1
ICS:: 17.220.20

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Описание (английский):

IEC 61557-4:2019 specifies the requirements applicable to equipment for measuring the resistance of earth conductors, protective earth conductors and conductors for equipotential bonding, including their connections and terminals, with an indication of the measured value or an indication of the limits. IEC 61557-4:2019 cancels and replaces the second edition published in 2007. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) complement to the measurement category in Clause 4; b) correction of the equation for operating uncertainty; c) complement to the requirements for measuring with DC; d) alignment of the structure with that of the whole IEC 61557 series.

Технические детали

Технический комитет: TC 85 - Measuring equipment for electrical and electromagnetic quantities
SKU: IEC 61557-4:2019

Abstract

Overview - IEC 61557-4:2019 (Resistance of earth connection and equipotential bonding)

Standard Reference: IEC 61557-4:2019 This IEC standard defines requirements for equipment used to measure the resistance of earth connections, protective earth conductors and equipotential bonding conductors in low-voltage distribution systems (up to 1 000 V AC and 1 500 V DC). It specifies required measurement ranges, performance limits, marking and user information, safety/overvoltage behaviour and tests for operating uncertainty. The 2019 edition is a technical revision that updates measurement category guidance, DC measurement requirements, operating uncertainty formulation and aligns structure with the wider IEC 61557 series.

Key topics and technical requirements

Scope & application: Equipment for measuring earth conductor resistance and equipotential bonding with value indication or limit indication.
Measurement categories: Devices intended for distribution systems must be rated Measurement Category III; devices for electrical equipment Measurement Category II (per IEC 61010-2-030).
Measuring voltage & current:
- Measuring voltage can be AC or DC; open-circuit voltage must be between 4 V and 24 V.
- Measuring current within the minimum range shall be at least 0.2 A.
Measuring range & resolution:
- Operating uncertainty guaranteed over the range that must include 0.2 Ω to 2 Ω.
- Digital instruments: resolution at least 0.1 Ω.
- Analogue scales: marked range must occupy ≥50% of scale length; scale division at least 0.5 mm per 0.1 Ω.
DC measurement: Equipment using DC must provide a reversing switch or allow interchanging of test leads to avoid polarization errors.
Operating uncertainty: Maximum permitted operating uncertainty ±30% within the marked measuring range (per standard test conditions).
Safety & overvoltage: Equipment must not expose the user to danger nor be damaged if accidentally connected to 120% of nominal system voltage.
Marking & instructions: Devices must display open-circuit voltage, measuring current, rated system voltages, measuring range, rated voltage-to-earth and measurement category. Operating instructions must include warnings (e.g., measure on de-energized circuits), battery life info and guidance for dual-polarity DC readings.

Applications - who uses IEC 61557-4:2019

Manufacturers of earth-resistance testers and clamp meters to ensure product compliance and safety.
Electrical contractors and site inspectors performing earthing and bonding verification in installations.
Maintenance and safety engineers responsible for periodic testing of protective earths and equipotential bonding.
Calibration and test laboratories developing test procedures and uncertainty budgets for earth-resistance equipment.
Certification bodies assessing conformity to low-voltage electrical safety testing standards.

Related standards

IEC 61557-1:2019 - General requirements for protective-measure test equipment
IEC 61010-2-030 & IEC 61010-031 - Safety requirements for measurement equipment and probes

Keywords: IEC 61557-4:2019, earth resistance testing, equipotential bonding, low voltage distribution systems, protective earth conductors, measurement uncertainty, measurement category, open-circuit voltage.

Overview - IEC 61557-4:2019 (Resistance of earth connection and equipotential bonding)

Key topics and technical requirements

Scope & application: Equipment for measuring earth conductor resistance and equipotential bonding with value indication or limit indication.
Measurement categories: Devices intended for distribution systems must be rated Measurement Category III; devices for electrical equipment Measurement Category II (per IEC 61010-2-030).
Measuring voltage & current:
- Measuring voltage can be AC or DC; open-circuit voltage must be between 4 V and 24 V.
- Measuring current within the minimum range shall be at least 0.2 A.
Measuring range & resolution:
- Operating uncertainty guaranteed over the range that must include 0.2 Ω to 2 Ω.
- Digital instruments: resolution at least 0.1 Ω.
- Analogue scales: marked range must occupy ≥50% of scale length; scale division at least 0.5 mm per 0.1 Ω.
DC measurement: Equipment using DC must provide a reversing switch or allow interchanging of test leads to avoid polarization errors.
Operating uncertainty: Maximum permitted operating uncertainty ±30% within the marked measuring range (per standard test conditions).
Safety & overvoltage: Equipment must not expose the user to danger nor be damaged if accidentally connected to 120% of nominal system voltage.
Marking & instructions: Devices must display open-circuit voltage, measuring current, rated system voltages, measuring range, rated voltage-to-earth and measurement category. Operating instructions must include warnings (e.g., measure on de-energized circuits), battery life info and guidance for dual-polarity DC readings.

Applications - who uses IEC 61557-4:2019

Manufacturers of earth-resistance testers and clamp meters to ensure product compliance and safety.
Electrical contractors and site inspectors performing earthing and bonding verification in installations.
Maintenance and safety engineers responsible for periodic testing of protective earths and equipotential bonding.
Calibration and test laboratories developing test procedures and uncertainty budgets for earth-resistance equipment.
Certification bodies assessing conformity to low-voltage electrical safety testing standards.

Related standards

IEC 61557-1:2019 - General requirements for protective-measure test equipment
IEC 61010-2-030 & IEC 61010-031 - Safety requirements for measurement equipment and probes

IEC 61557-4:2019 PDF

Технические детали

Abstract

Overview - IEC 61557-4:2019 (Resistance of earth connection and equipotential bonding)

Key topics and technical requirements

Applications - who uses IEC 61557-4:2019

Related standards

Похожие стандарты

Abstract

Overview - IEC 61557-4:2019 (Resistance of earth connection and equipotential bonding)

Key topics and technical requirements

Applications - who uses IEC 61557-4:2019

Related standards

Похожие стандарты

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