IEC 61557 Electrical Safety in Low Voltage Distribution Systems up to 1000 V AC and 1500 V DC - Testing of Protective Measures

The IEC 61557 standard published by the International Electrotechnical Commission (IEC) consists of the following subsections under the main heading “Electrical safety in low voltage distribution systems up to 1000 Volts AC and 1500 Volts DC - Equipment for testing, measuring or monitoring protective measures”:

• IEC 61557-1 Part 1: General requirements. This standard describes the general requirements applicable to measuring and monitoring equipment for testing electrical safety in low voltage distribution systems with rated voltages up to 1000 Volts AC and 1500 Volts DC. When measuring equipment or measuring facilities include measuring tasks of the various measuring equipment covered by this series of standards, the part of this series relating to each of the measuring tasks applies. This standard does not cover functional security or cyber security.
• IEC 61557-2 Part 2: Insulation resistance. This standard describes the requirements applicable to equipment for measuring the insulation resistance of equipment and installations in the de-energized state.
• IEC 61557-3 Part 3: Loop impedance. This standard describes requirements applicable to equipment for measuring loop impedance between a line conductor and a protective conductor, between a line conductor and a neutral, or between two line conductors using the voltage drop when the circuit under test is loaded.
• IEC 61557-4 Part 4: Resistance of earth connection and equipotential bonding. This standard describes the requirements applicable to equipment for measuring the resistance of grounding conductors, protective grounding conductors and equipotential bonding conductors, including their connections and terminals, with an indication of the measured value or limits.
• IEC 61557-5 Part 5: Earth resistance. This standard describes the requirements applicable to measuring equipment for measuring resistance to earth using an AC voltage.
• IEC 61557-6 Part 6: Efficiency of residual current devices (RCD) in TT, TN and IT systems. This standard describes the requirements applicable to measuring equipment to test the effectiveness of the protective measures of residual current devices installed in TT, TN and IT systems. The purpose of this standard is not to verify residual current devices against product standards.
• IEC 61557-7 Part 7: Phase sequence. This standard describes the requirements applicable to measuring equipment for testing phase sequence in three-phase distribution systems. The indication of the phase sequence can be mechanical, visual and/or audible. This standard does not apply to additional measurements and monitoring relays for other quantities.
• IEC 61557-8 Part 8: Insulation monitoring devices for IT systems. This standard describes the requirements for insulation monitoring devices (IMD) that permanently monitor the grounding resistance RF in circuits with rated voltages up to 1000 Volts AC, as well as in ungrounded IT DC systems with voltages up to 1500 Volts DC, regardless of the measuring principle.
• IEC 61557-9 Part 9: Equipment for the location of insulation fault in IT systems. This standard describes the requirements for an insulation fault location system that localizes insulation faults in any part of the system in circuits with rated voltages up to 1000 Volts AC, as well as in ungrounded IT DC systems with voltages up to 1500 Volts DC, regardless of the measuring principle.
• IEC 61557-10 Part 10: Combined measuring equipment for testing, measuring and monitoring protective measures. This standard describes the requirements for a single apparatus, various measuring functions or combined measuring equipment that combines testing, measuring or monitoring methods. This standard should be read together with the first part.
• IEC 61557-11 Part 11: Efficiency of residual current monitors (RCM) in TT, TN and IT systems. This standard describes the test equipment requirements for testing the effectiveness of residual current monitors (RCMs) already installed in distribution systems. This test equipment can be used in any network such as TN, TT or IT system. The test equipment can also be used to test directional discriminant residual current monitors in IT systems. It is not the purpose of this standard to verify residual current monitors against product standards.
• IEC 61557-12 Part 12: Power measuring and monitoring devices (PMD). This standard describes the requirements for power measuring and monitoring devices that measure and monitor electrical quantities and optionally other external signals in electrical distribution systems. These requirements also define performance in single and three-phase AC or DC systems with rated voltages up to 1000 Volts AC or 1500 Volts DC. These devices are fixed or portable and are designed for indoor or outdoor use. Power measuring and monitoring devices for the electrical parameters described in this standard are used for general industrial and commercial applications. This standard does not address functional security and cybersecurity issues.
• IEC 61557-13 Part 13: Hand-held and hand-operated current clamps and sensors for the measurement of leakage currents in electrical distribution systems. This standard specifies performance for hand-held and hand-held current clamps and sensors for the measurement of leakage currents in electrical distribution systems, up to and including 1000 Volts AC and 1500 Volts DC, taking into account the influence of high external low-frequency magnetic fields and other influencing quantities. requirements are explained.
• IEC 61557-14 Part 14: Equipment for testing the safety of electrical equipment for machinery. This standard describes specific requirements for test and measurement equipment used to determine the electrical safety of machine electrical equipment. The IEC 61010 and IEC 61557 series standards do not cover all safety aspects of testing machine electrical equipment. This standard provides additional protection against electric shock for the tester and bystanders during high voltage tests and in case of misuse of test equipment.
• IEC 61557-15 Part 15: Functional safety requirements for insulation monitoring devices in IT systems and hardware for insulation fault location in IT systems. This standard describes requirements for functional safety.
• IEC 61557-16 Part 16: Equipment for testing the effectiveness of protective measures of electrical equipment and/or medical electrical equipment. This standard describes performance requirements for test and measurement equipment to determine the effectiveness of protective measures of electrical equipment and/or medical electrical equipment described in the IEC 62353 standard.
• IEC 61557-17 Part 17: Non-contact AC voltage indicators. This standard describes the minimum performance requirements for non-contact AC voltage indicators to reduce the risk of electric shock to the tester and bystanders from misinterpretation of the indicator. Products designed and manufactured in accordance with this standard are for use by electrical experts only. Non-contact AC voltage indicators are not designed to test the absence of operating voltage.
• IEC 61557-18 Part 18: DC home supply equipment monitoring device. This standard describes the requirements for DC electric vehicle supply equipment monitoring devices that provide insulation monitoring in accordance with the requirements of the IEC 61851 standard.

Among the numerous tests, measurements, analyses, and evaluations our organization provides for businesses in various sectors, we also offer equipment services for testing, measuring, or monitoring electrical safety and protective measures in low-voltage distribution systems up to 1000 Volts AC and 1500 Volts DC, in accordance with the IEC 61557 standard, thanks to our trained and expert staff and advanced technological equipment.