IS/IEC 61557 : Part 9 : 2023 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 9 Equipment for Insulation Fault Location in IT Systems

ICS 25.040.40

ETD 12

NATIONAL FOREWORD

This Indian Standard (Part 9) which is identical to IEC 61557-9 : 2023 ‘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 9: Equipment for insulation fault location in IT systems’ issued by the International Electro technical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Measuring Equipment for Basic Electrical Quantities Sectional Committee and approval of the Electro technical Division Council.

This standard has been published in several parts. The other parts of the series are as follows:

Part 1 General requirements

Part 2 Insulation resistance

Part 3 Loop impedance

Part 4 Resistance of earth connection and equipotential bonding

Part 5 Resistance to earth

Part 6 Effectiveness of residual current devices (RCD) in TT, TN and IT systems

Part 7 Phase sequence

Part 8 Insulation monitoring devices for IT systems

Part 10 Combined measuring equipment for testing measuring or monitoring of protective measures

Part 11 Effectiveness of residual current monitors (RCM) In TT, TN and IT systems

Part 12 Power metering and monitoring devices (PWD)

Part 13 Hand- held and hand-manipulated current clamps and sensors for measurement of leakage currents in electrical distribution systems

Part 14 Equipment for testing the safety of electrical equipment for machinery

Part 15 Functional safety requirements for insulation monitoring devices in IT systems and equipment for insulation fault location in IT systems

Part 16 Equipment for testing the effectiveness of the protective measures of electrical equipment and/or medical electrical equipment

Part 17 Non-contact a.c. voltage indicators

The text of the IEC standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’; and

b) Comma (,) has been used as a decimal marker, while in Indian Standards the current practice is to use a point (.) as the decimal marker.