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AS/NZS 4777.1:2016


Grid connection of energy systems via inverters, Part 1: Installation requirements

AS NZS 4777.1 2016 specifies the electrical and general safety installation requirements for inverter energy systems (IES) up to or equal to 200kVA for the injection of electric power to an electrical installation connected to the grid at low voltage.
Published: 30/09/2016
Inclusive of GST
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Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope and application
1.1.1 Scope
1.1.2 Application
1.2 Normative references
1.3 Definitions
2 General requirements
2.1 General
2.2 Typical configurations
2.3 General requirements for inverter energy systems (IES)
3 Connection of the IES to the electrical installation
3.1 General
3.2 Connections
3.2.1 General
3.2.2 Connection to switchboard
3.2.3 Connector or coupling connections to the IES
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 Requirements for central protection and inverter integrated protection General Phase balance protection Central voltage and frequency protection requirements Connection and reconnection procedure
3.4.5 Residual current devices (RCDs)
3.4.6 Demand response mode (DRM)
3.4.7 IES operational settings
3.4.8 Export control of an IES General Hard limit Soft limit
4 Connection of inverter to energy source
4.1 General
4.2 Connectors or coupling connections
4.3 Cabling
4.3.1 General requirements
4.3.2 Cable identification
4.4 Overcurrent protection
4.5 Isolation devices
5 Additional requirements
5.1 Earth fault detection
5.1.1 General
5.1.2 Insulation monitoring
5.1.3 Residual current detection for PV IES
5.2 Segregation of circuits
5.3 Additional installation requirements
5.3.1 Inverter installation
5.3.2 Equipment weatherproofing
5.3.3 Seismic protection
5.4 Additional requirements for multiple mode IES
5.4.1 General
5.4.2 Additional inverter requirements
5.4.3 Circuit arrangement
5.4.4 RCDs on multiple mode inverter system final subcircuits
5.5 Multiple inverter installations
5.5.1 General
5.5.2 Single inverter or group of inverters with capacity no more than 5 kVA per phase
5.5.3 Inverters on the same switchboard General IES connected to switchboards with loads IES connected to switchboards without loads
5.5.4 Inverter energy systems (IES) on different distribution switchboards
6 Signs and labels
6.1 General
6.2 Signs for the switchboard to which the IES is directly connected
6.3 Signs for other switchboards
6.4 Signs for inverter locations
6.5 Energy source labelling
6.6 Demand response mode (DRM) labelling
6.7 Signs for shutdown procedure
6.8 Signs located adjacent to inverter(s)
6.9 Signs for multiple systems
6.10 Signs for multiple energy sources
6.11 Signs for multiple mode IES (including systems with stand-alone functionality)
6.12 Signs for emergency services
7 System documentation and commissioning
7.1 General
7.2 Manual
7.3 Verification
7.3.1 General
7.3.2 Initial verification
7.3.3 Periodic verification
7.3.4 Alterations, additions and repairs
7.4 Visual inspection
7.5 Testing
7.6 Commissioning
Appendix A
A1 Overview
A2 Example signs for the switchboard to which the inverter energy system (IES) is directly connected
A3 Example signs for other switchboards
A4 Example sign for inverter locations
A5 Example energy source labelling
A6 Example demand response mode (DRM) labelling
A7 Example sign for shutdown procedure
A8 Example signs located adjacent to inverters
A9 Example signs for multiple systems
A10 Example signs for multiple energy sources
A11 Typical signs for multiple mode IES (Including systems with stand-alone functionality)
Appendix B
B1 Normal operation
B2 Overcurrent fault conditions
Appendix C
C1 General
C2 Assessing the consumer installation
C2.1 Site visit
C2.2 Assessing the site for the energy source installation
C2.3 Assessing the site for inverter location
C2.4 Assessing point of supply, main switchboard and tariff implications of connecting an IES
C2.5 Assessing site load and current energy use
C3 Voltage rise—Issues
C3.1 Maximum allowed voltage rise
C3.2 Example 1—Single-phase overhead grid connection with a single-phase 4 kVA inverter system
C3.3 Example 2—Three-phase connection with 5 kVA three-phase inverter system
C3.4 Example 3—Three-phase connection with 30 kVA three-phase inverter system
C4 Phase balance—Issues
Appendix D
Appendix E
Appendix F
F1 General
F2 Australia
F3 Integration in mini or isolated grids
F4 New Zealand
Cited references in this standard
AS/NZS 61386.1
Conduit systems for cable management, Part 1: General requirements
Electrical installations — Periodic assessment
Electrical installations — Selection of cables, Part 1.2: Cables for alternating voltages up to and including 0.6/1 kV — Typical New Zealand conditions
Electrical installations — Secondary batteries installed in buildings, Part 1: Vented cells
Electrical installations — Secondary batteries installed in buildings, Part 2: Sealed cells
Content history
[Available Superseded]
DR AS/NZS 4777.1:2016