AS/NZS 4777.1:2024
Grid connection of energy systems via inverters, Part 1: Installation requirements
Standard specifies safety and installation requirements for inverter energy systems (IES) intended for the injection of electric power through an electrical installation to the grid. IES are distributed energy resources when connecting to the grid and need to ensure overall safe operation of the installation and interaction with the broader grid.
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AS/NZS 4777.1:2024 Grid connection of energy systems via inverters Installation requirements
Preface
Section 1 Scope and general
1.1 Scope and application
1.1.1 Scope
1.1.2 Application
1.2 Normative references
1.3 Terms and definitions
Section 2 General requirements
2.1 General
2.2 Typical configurations
2.3 Installation and selection requirements for inverter energy systems (IES)
2.3.1 General
2.3.2 Balance
2.4 Installation requirements
2.4.1 Inverter installation
2.4.2 Equipment weatherproofing
2.4.3 Seismic protection (NZ only)
Section 3 Connection of the IES to the electrical installation
3.1 General
3.2 Connections
3.2.1 General
3.2.2 Connection to electrical installation
3.2.3 Connector or coupling connections to the inverters
3.3 Selection and installation of wiring systems
3.3.1 General
3.3.2 Installation method
3.3.3 Voltage rise
3.4 Control and protection
3.4.1 General
3.4.2 Overcurrent protection
3.4.3 Isolation switches
3.4.4 Residual current devices (RCDs)
3.4.5 Interface protection for IES
3.4.6 Demand response mode (DRM)
3.4.7 IES operational settings
3.4.8 Generation control of an IES
3.5 Multiple inverter and IES installations
3.5.1 General
3.5.2 Grouped inverters with capacity no more than 5 kVA per phase (isolation requirements)
3.5.3 Inverters on the same switchboard
3.6 Inverter power sharing device
3.6.1 General
3.6.2 Selection of IPSD
3.6.3 Installation of IPSD
3.6.4 Selection and installation of wiring systems
3.6.5 Control and protection
Section 4 Connection of energy source to an inverter
4.1 Energy sources with applicable installation standards
4.2 Electric Vehicle and electric vehicle supply equipment
4.3 Energy sources without applicable installation standards
4.3.1 General
4.3.2 d.c. maximum voltage limits
4.3.3 Connectors or coupling connections
4.3.4 Wiring systems
4.3.5 Overcurrent protection
4.3.6 Isolation devices
4.3.7 Earth fault detection, protection and alarm
Section 5 Multiple mode IES installation
5.1 General
5.2 Substitute Supply installations
5.2.1 General
5.2.2 Connection by fixed installation wiring
5.3 Alternative supply IES installations
5.3.1 General
5.3.2 Connection to the installation
5.3.3 Multiple mode inverter local Isolator
5.3.4 Multiple mode inverter supply cable rating
5.3.5 Overcurrent protection for the alternative supply
5.3.6 Alternative supply switchboard
5.4 Independent supply IES installations
5.4.1 General
5.4.2 Connection to the installation
5.4.3 Independent supply inverter local isolator
5.4.4 Independent supply cable
5.4.5 Overcurrent protection for the independent supply
5.4.6 Independent supply switchboard
5.5 Electric Vehicles as energy source installations
5.6 Engine driven generating set connection to multiple mode inverter
5.7 Connection of portable IES
5.7.1 General
5.7.2 Connection to installation
5.7.3 Inlet plug overcurrent protection
5.7.4 Alternative supply cable
5.7.5 Alternative supply switchboard
Section 6 Signs and labels
6.1 General
6.2 Signs for emergency shutdown procedure
6.3 Signs for the switchboard to which the IES is directly connected
6.4 Signs for other switchboards
6.5 Signs for inverter locations
6.6 Signs located adjacent to inverter(s)
6.7 Signs for multiple systems
6.8 Signs for multiple mode inverters
6.9 Signs for inverters with substitute supply function
6.10 Signs for portable IES inlet plug
6.11 Energy source labelling
6.11.1 Energy sources with applicable installation standards
6.11.2 Energy source labelling for electric vehicles and electric vehicle supply equipment
6.11.3 Energy sources without applicable installation standards
6.12 Additional signs for IPSD
6.12.1 Signs for IPSD system layout
6.12.2 Signs for IPSD current sensing devices
Section 7 System documentation and commissioning
7.1 General
7.2 Manual
Section 8 Verification
8.1 General
8.2 Visual inspection
8.3 Testing
8.3.1 General
8.3.2 Additional testing substitute supply
8.3.3 Additional testing alternative supply
8.3.4 Additional testing independent supply
8.3.5 Additional testing portable IES
8.4 Commissioning
8.4.1 General
8.4.2 IPSD commissioning
Appendix A (informative) Example signs
Appendix B (informative) Voltage rise calculation
Appendix C (normative) Phase balance
Appendix D (informative) Information on electricity distributor requirements
Bibliography
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References
Electrical installations - Known as the Australian/New Zealand Wiring Rules
Electrical installations - Selection of cables - Part 1.1: Cables for alternating voltages up to and including 0.6/1 kV - Typical Australian installation conditions
Electrical installations - Selection of cables - Part 1.2: Cables for alternating voltages up to and including 0.6/1 kV - Typical New Zealand conditions
Approval and test specification - Plugs and socket-outlets
Demand response capabilities and supporting technologies for electrical products - Part 1: Demand response framework and requirements for demand response enabling devices (DREDs)
Grid connection of energy systems via inverters, Part 2: Inverter requirements
Installation and safety requirements for photovoltaic (PV) arrays
Electrical installations - Safety of battery systems for use with power conversion equipment
Appliance couplers for household and similar general purposes, Part 1: General requirements (IEC 60320-1, Ed 3.1 (2015) MOD)
Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCBs) - Part 1: General rules
Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
Low-voltage switchgear and controlgear - Part 6.1: Multiple function equipment - Transfer switching equipment
Seismic performance of engineering systems in buildings
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AS/NZS 4777.1:2024 Grid connection of energy systems via inverters Installation requirements
Preface
Section 1 Scope and general
1.1 Scope and application
1.1.1 Scope
1.1.2 Application
1.2 Normative references
1.3 Terms and definitions
Section 2 General requirements
2.1 General
2.2 Typical configurations
2.3 Installation and selection requirements for inverter energy systems (IES)
2.3.1 General
2.3.2 Balance
2.4 Installation requirements
2.4.1 Inverter installation
2.4.2 Equipment weatherproofing
2.4.3 Seismic protection (NZ only)
Section 3 Connection of the IES to the electrical installation
3.1 General
3.2 Connections
3.2.1 General
3.2.2 Connection to electrical installation
3.2.3 Connector or coupling connections to the inverters
3.3 Selection and installation of wiring systems
3.3.1 General
3.3.2 Installation method
3.3.3 Voltage rise
3.4 Control and protection
3.4.1 General
3.4.2 Overcurrent protection
3.4.3 Isolation switches
3.4.4 Residual current devices (RCDs)
3.4.5 Interface protection for IES
3.4.6 Demand response mode (DRM)
3.4.7 IES operational settings
3.4.8 Generation control of an IES
3.5 Multiple inverter and IES installations
3.5.1 General
3.5.2 Grouped inverters with capacity no more than 5 kVA per phase (isolation requirements)
3.5.3 Inverters on the same switchboard
3.6 Inverter power sharing device
3.6.1 General
3.6.2 Selection of IPSD
3.6.3 Installation of IPSD
3.6.4 Selection and installation of wiring systems
3.6.5 Control and protection
Section 4 Connection of energy source to an inverter
4.1 Energy sources with applicable installation standards
4.2 Electric Vehicle and electric vehicle supply equipment
4.3 Energy sources without applicable installation standards
4.3.1 General
4.3.2 d.c. maximum voltage limits
4.3.3 Connectors or coupling connections
4.3.4 Wiring systems
4.3.5 Overcurrent protection
4.3.6 Isolation devices
4.3.7 Earth fault detection, protection and alarm
Section 5 Multiple mode IES installation
5.1 General
5.2 Substitute Supply installations
5.2.1 General
5.2.2 Connection by fixed installation wiring
5.3 Alternative supply IES installations
5.3.1 General
5.3.2 Connection to the installation
5.3.3 Multiple mode inverter local Isolator
5.3.4 Multiple mode inverter supply cable rating
5.3.5 Overcurrent protection for the alternative supply
5.3.6 Alternative supply switchboard
5.4 Independent supply IES installations
5.4.1 General
5.4.2 Connection to the installation
5.4.3 Independent supply inverter local isolator
5.4.4 Independent supply cable
5.4.5 Overcurrent protection for the independent supply
5.4.6 Independent supply switchboard
5.5 Electric Vehicles as energy source installations
5.6 Engine driven generating set connection to multiple mode inverter
5.7 Connection of portable IES
5.7.1 General
5.7.2 Connection to installation
5.7.3 Inlet plug overcurrent protection
5.7.4 Alternative supply cable
5.7.5 Alternative supply switchboard
Section 6 Signs and labels
6.1 General
6.2 Signs for emergency shutdown procedure
6.3 Signs for the switchboard to which the IES is directly connected
6.4 Signs for other switchboards
6.5 Signs for inverter locations
6.6 Signs located adjacent to inverter(s)
6.7 Signs for multiple systems
6.8 Signs for multiple mode inverters
6.9 Signs for inverters with substitute supply function
6.10 Signs for portable IES inlet plug
6.11 Energy source labelling
6.11.1 Energy sources with applicable installation standards
6.11.2 Energy source labelling for electric vehicles and electric vehicle supply equipment
6.11.3 Energy sources without applicable installation standards
6.12 Additional signs for IPSD
6.12.1 Signs for IPSD system layout
6.12.2 Signs for IPSD current sensing devices
Section 7 System documentation and commissioning
7.1 General
7.2 Manual
Section 8 Verification
8.1 General
8.2 Visual inspection
8.3 Testing
8.3.1 General
8.3.2 Additional testing substitute supply
8.3.3 Additional testing alternative supply
8.3.4 Additional testing independent supply
8.3.5 Additional testing portable IES
8.4 Commissioning
8.4.1 General
8.4.2 IPSD commissioning
Appendix A (informative) Example signs
Appendix B (informative) Voltage rise calculation
Appendix C (normative) Phase balance
Appendix D (informative) Information on electricity distributor requirements
Bibliography
Previous versions
AS/NZS 4777.1:2024
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.