IEC 61557-2:2019 pdf download

IEC 61557-2:2019 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 equipment for measuring the insulation resistance of equipment and installations in the de-energized state.
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 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 0-031 , 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 61 01 0-2-034:201 7, Safety requirements for electrical equipment for measurement, control, and laboratory use – Part 2-034: Particular requirements for measurement equipment for insulation resistance and test equipment for electric strength 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
4 Requirements
4.1 General requirements In addition to the requirements of IEC 61 557-1 :201 9, Clause 4, the requirements of Clause 4 of this document shall apply. Insulation measurement equipment shall fulfil the safety requirements of IEC 61 01 0-2-034. Test leads and test probes used with insulation measuring equipment shall fulfil the requirements of IEC 61 01 0-031 . Equipment intended for making measurements on distribution systems shall be rated at least for measurement category III. Equipment intended for making measurements on electrical equipment shall be rated at least for measurement category II. 4.2 Output voltage The output voltage shall be a DC voltage. The open-circuit voltage shall not exceed 1 ,25 times the rated output voltage. 4.3 Rated current The rated current shall be at least 1 mA. 4.4 Measuring current The measuring current shall not exceed 1 5 mA peak. Any AC component present shall not exceed 1 ,5 mA peak. 4.5 Influence of external capacitors The indication of a measured resistance of 1 (± 1 %) MΩ shall not differ by more than 1 0 % as a result of AC voltage components possibly present in the output voltage, when a capacitor of 2 (± 1 0 %) µF is connected in parallel with the measured resistance. If the manufacturer specifies a higher capacitance for the object under test, the 2 µF capacitor shall be replaced to adhere to the manufacturer’s specified capacitance value. 4.6 Overvoltage The user shall not be subjected to danger when extraneous DC or AC voltages up to 1 20 % of the highest rated output voltage are accidentally applied for a duration of not less than 1 0 s to the measurement terminals of the measuring equipment. When the measuring equipment bears one of the following markings, the applied extraneous AC overvoltage may be reduced to a voltage of 1 ,1 times the line-to-line voltage:a) DO NOT USE IN DISTRIBUTION SYSTEMS WITH VOLTAGES HIGHER THAN … V. The marking shall be written in the corresponding country language. The value of the voltage shown on the marking shall be 1 ,1 times the maximum line-to-line voltage. or b) Example of pictogram for a 500 V AC system
5 Marking and operating instructions
5.1 Marking
In addition to the marking in accordance with IEC 61 557-1 :201 9, 5.1 and 5.2 and IEC 61 01 0-2-034:201 7, Clause 5, the following information shall be provided on the
measuring equipment.
– rated output voltage,
– rated current,
– measurement range,
– rated voltage to earth and measuring category.
5.2 Operating instructions
The operating instructions shall state the following information in addition to the statements specified in IEC 61 557-1 :201 9, 5.3 and in IEC 61 01 0-2-034:201 7, Clause 5:
– a warning stating that measurements shall be carried out only on parts of an installation or equipment that is de-energized;
– a statement on the correct operation when power is supplied by a hand-driven generator;
– the number of possible measurements shall be stated for measuring equipment with power supplied by batteries/accumulators;
– a statement about the maximum capacitance value of the tested object if higher than 2 µF;
– a statement about intended applications of the equipment;
– a statement about discharge time and relevant capacity of the tested object.