IEC 61557-4 pdf free download
IEC 61557-4 pdf free download.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 4: Resistance of earth connection and equipotential bonding.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 61010-031, Safety requirements for electrical equipment for measurement, control and laboratory use — Part 031: Safety requirements for hand-held and hand-manipulated probe assemblies for electrical test and measurement
IEC 61010-2-030:2017, Safety requirements for electrical equipment for measurement, control, and laboratory use — Part 2-030: Particular requirements for equipment having testing or measuring circuits
IEC 61557-1:2019, Electrical safety in low voltage distribution systems up to 1 000 VAC and
1 500 V DC — Equipment for testing, measuring or monitoring of protective measures — Part 1.
General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61 557-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Requirements
4.1 General
In addition to the requirements of IEC 61557-1:2019, Clause 4, the following requirements shall apply.
Equipment intended for making measurements on distribution systems shall, at the minimum, be rated for measurement category Ill in accordance with IEC 61010-2-030.
Equipment intended for making measurements on electrical equipment shall, at the minimum, be rated for measurement category II in accordance with IEC 61010-2-030.
Test leads and test probes used with the measuring equipment shall fulfil the requirements of
IEC 61010-031.
4.2 Measuring voltage
The measuring voltage may be a DC or an AC voltage. The open-circuit voltage shall not exceed 24 V and shall not be less than 4 V.
4.3 Measuring current
The measuring current within the minimum measuring range according to 4.5 shall not be less than 0,2 A.
4.4 Measuring with DC
Resistance measuring equipment using a DC voltage as a measuring voltage shall be provided either with a reversing switch or allow the interchanging of test leads.
4.6 External resistance
When external resistances are included in the calibration as a zero offset, then this shall be
indicated.
This offset shall remain included in the calibration as long as it is indicated on the measuring instrument, regardless of any changes in range or function.
4.7 Indication of limits
Equipment that purely indicates the result of a comparison between measurements and limit values shall unambiguously display if either the upper or lower limit is reached.
4.8 Overvoltage
The user shall not be exposed to danger and the equipment shall not be damaged when the measuring equipment is accidentally connected with 120 % of the nominal voltage of the distribution system on which the measuring equipment may be used.
Protective devices of the test equipment may be activated.
5 Marking and operating instructions
5.1 Marking
In addition to IEC 6 1557-1:2019, 5.1 and 5.2, the following information shall be provided on the measuring equipment:
— open-circuit voltage;
— measuring current;
— the nominal system voltages for which the equipment has been rated;
— the measuring range in accordance with 4.5;
— rated voltage to earth and measurement category.IEC 61557-4 pdf download.
