IEC 61557-5:2019 pdf download

IEC 61557-5:2019 pdf download.Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c.
1 Scope
This part of IEC 61 557 specifies the requirements applicable to measuring equipment for measuring the resistance to earth using an AC voltage.
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 60364-6:201 6, Low voltage electrical installations – Part 6: Verification IEC 61 01 0-1 :201 0, Safety requirements for electrical equipment for measurement, control, and laboratory use – Part 1: General requirements IEC 61 01 0-1 :201 0/AMD1 :201 6 1 IEC 61 01 0-2-030:201 7, Safety requirements for electrical equipment for measurement, control, and laboratory use – Part 2-030: Particular requirements for equipment having testing or measuring circuits IEC 61 01 0-2-032, Safety requirements for electrical equipment for measurement, control and laboratory use – Part 2-032: Particular requirements for hand-held and hand-manipulated current sensors for electrical test and measurement IEC 61 243-3, Live working – Voltage detectors – Part 3: Two-pole low-voltage type IEC 61 557-1 :201 9, 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 1: General requirements
3 Terms and definitions
For the purposes of this document, the terms, definitions and symbols given in IEC 61 557-1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses:3.1 resistance to earth R A real part of the impedance to earth Note 1 to entry: resistance to ground (US). Note 2 to entry: IEC 60364-6 uses the term “earth resistance”, which is considered to be the same. [SOURCE: IEC 60050-1 95:1 998, 1 95-01 -1 8, modified – Notes 1 and 2 to entry and a symbol have been added.] 3.2 disturbance voltage voltage produced between two points on two separate conductors by an electromagnetic disturbance, measured under specified conditions and superimposed on the measuring voltage [SOURCE: IEC 60050-1 61 :1 990, 1 61 -04-01 , modified – in alignment with the use in this document; in addition, the deprecated term “interference voltage” has been deleted.] 3.3 earth electrode conductive part, which may be embedded in a specific conductive medium, for example concrete or coke, in electric contact with the Earth [SOURCE: IEC 60050-1 95:1 998, 1 95-02-01 , modified – The US variant, “ground electrode” has been omitted.] 3.4 earth electrode terminal connection point for a probe connected to the earth electrode to be tested and that is used for the injection of the test current required for the purpose of measurement Note 1 to entry: In accordance with the requirements of this document, earth electrode terminals are marked “E”. 3.5 earth electrode probe terminal connection point for a probe connected to the earth electrode to be tested and that is used as a voltage probe either connected direct to or nearest to the earth electrode for sampling potentials during measurement Note 1 to entry: In accordance with the requirements of this document, earth electrode probe terminals are marked “ES”. 3.6 auxiliary earth electrode terminal terminal for connection to an additional temporary earth electrode that is used for injection of a test current required for the purpose of measurements Note 1 to entry: In accordance with the requirements of this document, auxiliary earth electrode terminals are marked “H”.
4 Requirements
4.1 General In addition to the requirements of IEC 61 557-1 :201 9, Clause 4, the requirements of Clause 4 of this document shall apply. 4.2 Output voltage The output voltage present across the terminals E and H shall be an AC voltage. 4.3 Disturbance voltage Values of influencing voltages caused by AC or DC currents from distribution systems shall be stated by the manufacturer in the operating instructions and shall be used for the calculation in Table 1 . 4.4 Permissible resistance of probe and auxiliary earth electrode The measuring equipment shall be capable of determining whether the maximum permissible resistances of the probes and auxiliary earth electrodes are exceeded.