IEC 61557-5 pdf free download

IEC 61557-5 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 5: Resistance to earth.
4 Requirements
4.1 General
In addition to the requirements of IEC 61557-1:2019, 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.
4.5 Electrical safety
No hazardous touch voltages shall appear during the measurements. This can be achieved by a suitable design of the source for the output voltage by:
— limiting the open-circuit value of the output voltage to 50 V AC RMS or 70 V peak;
— or, limiting the short-circuit output current to 3,5 mA AC RMS or 5 mA peak in the event that the output voltage value could exceed U(,
— if the output voltage source does not comply with either of the above requirements, automatic disconnection of the output voltage source shall operate within a permissible time period, in accordance with IEC 61010-1:2010/AMD1:2016, Figure 2.
Terminals shall be rated for voltages less than or equal to 50 V or, at the minimum, for a working voltage equal to the nominal voltage of the distribution system and measurement category II in accordance with IEC 61010-2-030.
In the event of ratings less than or equal to 50 V, a warning shall be given in the operating instructions to check the absence of hazardous voltage on the earthing system with a two-pole low-voltage detector according to IEC 61243-3.
Test leads and accessories in accordance with IEC 61 010-031, except for earth spikes/rods, shall, at the minimum, correspond to the rating of the terminals.
4.6 Clamps intended to measure earth loop resistances according to IEC 60364-6:2016, Annex C, Clause C.3
Clamps intended to measure the earth loop resistance in accordance with IEC 60364-6:2016, Annex C, Clause C.3, whether attached to the instrument or stand alone, shall be specified according to IEC 61010-2-032 as Type A or Type B.
If specified for Type A, the rating shall, at a minimum, be for measurement category II.
If specified for Type B, the rating shall, at a minimum, be for measurement category II and a warning shall be given in the operating instructions to check in advance the absence of hazardous voltages on the earthing system with voltage testers according to IEC 61243-3.
5 Marking and operating instructions
5.1 Marking
In addition to IEC 61557-1:2019, 5.1 and 5.2, the following information shall be provided on the measuring equipment:
— measurement range within which the maximum operating uncertainty applies;
— frequency of the output voltage;
— name of the terminals (if applicable):
— E: terminal for the earth electrode;
— ES: terminal for the probe electrode placed nearest to the earth electrode;
— S: terminal for the probe electrode;
— H: terminal for the auxiliary earth electrode;
— marking for terminals H, S, E and ES according to the requirements of 4.5;
— rated voltage to earth or measuring category and maximum voltage to earth followed by the symbol according to IEC 61010-1:2010, Table 1, symbol 12.
5.2 Operating instructions
In addition to IEC 61557-1:2019, 5.3, the following information shall be provided in the operating instructions:
— the range of applications (e.g. for industrial plants or others) for the equipment for measuring resistance to earth;
— the influence of series disturbance voltages that are larger than the values stated in 4.3, if applicable;
— a statement relating to the correct operation of the hand-driven generator (if provided);
— the designations of terminals when different from those specified in 5.1;
— if applicable, a warning shall be given in the operating instructions that in the case of Type B clamps the absence of hazardous voltages on the earthing system shall be checked with two-pole low-voltage detector according to IEC 61243-3.IEC 61557-5 pdf download.