AS/NZS 60255.26:2025
Measuring relays and protection equipment – Part 26: Electromagnetic compatibility requirements
Standard specifies the requirements for electromagnetic compatibility for measuring relays and protection equipment. It is applicable to measuring relays and protection equipment and combinations of devices to form schemes for power system protection including the control, monitoring, communication and process interface equipment used with those systems.
Tests specified in this document are not required for equipment not incorporating electronic circuits, for example electromechanical relays.
This document is an adoption with national modifications, and has been reproduced from IEC 60255‑26:2023 Measuring relays and protection equipment – Part 26: Electromagnetic compatibility requirements.
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AS/NZS 60255.26:2025 Measuring relays and protection equipment Electromagnetic compatibility requirements (IEC 60255-26:2023 (ED. 4.0) MOD)
Preface
Section FOREWORD
Section 1 Scope
1.1 General
1.2 Emission
1.3 Immunity
Section 2 Normative references
Section 3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
Section 4 Electromagnetic environmental levels
4.1 General
4.2 Zone A, severe electromagnetic environment
4.3 Zone B, typical electromagnetic environment
Section 5 Emission
5.1 Radiated emission
5.2 Conducted emission
Section 6 Immunity
6.1 Immunity of enclosure
6.2 Immunity of auxiliary power supply port
6.3 Immunity of signal/control port and wired network port
6.4 Immunity of input and output ports
6.5 Immunity of earth port
Section 7 Test set-up and procedures
7.1 General
7.2 Emission
7.2.1 General
7.2.2 Radiated emission
7.2.3 Conducted emission
7.3 Immunity
7.3.1 General
7.3.2 Electrostatic discharge immunity test
7.3.3 Radiated electromagnetic field immunity test
7.3.4 Electrical fast transient/burst immunity test
7.3.5 Damped oscillatory wave immunity test
7.3.6 Surge immunity test
7.3.7 Conducted RF immunity test
7.3.8 Conducted power frequency immunity test on binary inputs
7.3.9 Power frequency magnetic field immunity test
7.3.10 Voltage dips and short interruptions test (AC or DC)
7.3.11 Ripple on DC input power port immunity test
7.3.12 Gradual shutdown / start-up tests
Section 8 Criteria for acceptance
8.1 Emission
8.2 Immunity
Section 9 Test report
Annex A (normative) Power frequency immunity tests on binary inputs
Annex B (informative) Background information for power frequency tests
Annex C (informative) Background information about spot frequency tests
Annex D (informative) EMC risk assessment
Annex E (informative) Considerations regarding radio interfaces
Annex F (informative) Immunity test to be considered in future
Bibliography
Figure 1 — Gradual shutdown / start-up test
Figure A.1 — Example of Zone A differential mode tests
Figure A.2 — Example of Zone B differential mode tests
Figure A.3 — Example of Zone A and Zone B common mode tests
Table 1 — Radiated emission tests – Enclosure port
Table 2 — Required highest frequency for radiated measurement
Table 3 — Conducted emission tests – AC and DC auxiliary power supply port
Table 4 — Conducted emission tests – Wired network port
Table 5 — Immunity tests – Enclosure port
Table 6 — Immunity tests – Auxiliary power supply port
Table 7 — Immunity tests – signal/control port and wired network port
Table 8 — Immunity tests – Input and output port
Table 9 — Immunity tests – Earth port
Table 10 — Radiated emission test
Table 11 — Conducted emission test
Table 12 — Electrostatic discharge immunity test
Table 13 — Radiated electromagnetic field immunity test (frequency sweep)
Table 14 — Radiated electromagnetic field immunity test (spot frequencies)
Table 15 — Electrical fast transient/burst immunity test
Table 16 — Damped oscillatory wave immunity test
Table 17 — Surge immunity test
Table 18 — Conducted RF immunity test (frequency sweep)
Table 19 — Conducted RF immunity test (spot frequencies)
Table 20 — Conducted power frequency immunity test on binary inputs
Table 21 — Power frequency magnetic field immunity test
Table 22 — Voltage dips and short interruptions test (AC or DC)
Table 23 — Ripple on DC input power port immunity test
Table 24 — Gradual shutdown and start-up test
Table 25 — Acceptance criteria for immunity tests
Table C.1 — Selection of spot frequencies
Table D.2 — Risk assessment, selecting representative EUT configuration(s)
Table E.1 — Listed standard with relevance
Table F.1 — Immunity test to be considered in future
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References
Electromagnetic compatibility (EMC) - Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests
Industrial, scientific and medical equipment – Radio-frequency disturbance characteristics – Limits and methods of measurement
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AS/NZS 60255.26:2025 Measuring relays and protection equipment Electromagnetic compatibility requirements (IEC 60255-26:2023 (ED. 4.0) MOD)
Preface
Section FOREWORD
Section 1 Scope
1.1 General
1.2 Emission
1.3 Immunity
Section 2 Normative references
Section 3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
3.2 Abbreviated terms
Section 4 Electromagnetic environmental levels
4.1 General
4.2 Zone A, severe electromagnetic environment
4.3 Zone B, typical electromagnetic environment
Section 5 Emission
5.1 Radiated emission
5.2 Conducted emission
Section 6 Immunity
6.1 Immunity of enclosure
6.2 Immunity of auxiliary power supply port
6.3 Immunity of signal/control port and wired network port
6.4 Immunity of input and output ports
6.5 Immunity of earth port
Section 7 Test set-up and procedures
7.1 General
7.2 Emission
7.2.1 General
7.2.2 Radiated emission
7.2.3 Conducted emission
7.3 Immunity
7.3.1 General
7.3.2 Electrostatic discharge immunity test
7.3.3 Radiated electromagnetic field immunity test
7.3.4 Electrical fast transient/burst immunity test
7.3.5 Damped oscillatory wave immunity test
7.3.6 Surge immunity test
7.3.7 Conducted RF immunity test
7.3.8 Conducted power frequency immunity test on binary inputs
7.3.9 Power frequency magnetic field immunity test
7.3.10 Voltage dips and short interruptions test (AC or DC)
7.3.11 Ripple on DC input power port immunity test
7.3.12 Gradual shutdown / start-up tests
Section 8 Criteria for acceptance
8.1 Emission
8.2 Immunity
Section 9 Test report
Annex A (normative) Power frequency immunity tests on binary inputs
Annex B (informative) Background information for power frequency tests
Annex C (informative) Background information about spot frequency tests
Annex D (informative) EMC risk assessment
Annex E (informative) Considerations regarding radio interfaces
Annex F (informative) Immunity test to be considered in future
Bibliography
Figure 1 — Gradual shutdown / start-up test
Figure A.1 — Example of Zone A differential mode tests
Figure A.2 — Example of Zone B differential mode tests
Figure A.3 — Example of Zone A and Zone B common mode tests
Table 1 — Radiated emission tests – Enclosure port
Table 2 — Required highest frequency for radiated measurement
Table 3 — Conducted emission tests – AC and DC auxiliary power supply port
Table 4 — Conducted emission tests – Wired network port
Table 5 — Immunity tests – Enclosure port
Table 6 — Immunity tests – Auxiliary power supply port
Table 7 — Immunity tests – signal/control port and wired network port
Table 8 — Immunity tests – Input and output port
Table 9 — Immunity tests – Earth port
Table 10 — Radiated emission test
Table 11 — Conducted emission test
Table 12 — Electrostatic discharge immunity test
Table 13 — Radiated electromagnetic field immunity test (frequency sweep)
Table 14 — Radiated electromagnetic field immunity test (spot frequencies)
Table 15 — Electrical fast transient/burst immunity test
Table 16 — Damped oscillatory wave immunity test
Table 17 — Surge immunity test
Table 18 — Conducted RF immunity test (frequency sweep)
Table 19 — Conducted RF immunity test (spot frequencies)
Table 20 — Conducted power frequency immunity test on binary inputs
Table 21 — Power frequency magnetic field immunity test
Table 22 — Voltage dips and short interruptions test (AC or DC)
Table 23 — Ripple on DC input power port immunity test
Table 24 — Gradual shutdown and start-up test
Table 25 — Acceptance criteria for immunity tests
Table C.1 — Selection of spot frequencies
Table D.2 — Risk assessment, selecting representative EUT configuration(s)
Table E.1 — Listed standard with relevance
Table F.1 — Immunity test to be considered in future
AS/NZS 60255.26:2025
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.