AS/NZS 5033:2014


Installation and safety requirements for photovoltaic (PV) arrays

AS NZS 5033 2014 sets out general installation and safety requirements for photovoltaic (PV) arrays, including d.c. array wiring, electrical protection devices, switching and earthing up to but not including energy storage devices, power conversion equipment or loads. Also known as PV standards.
Published: 06/11/2014
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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 Objective
1.3 Normative references
1.4 Definitions
2 PV array system configuration
2.1 Configuration
2.1.1 General
2.1.2 PV system architectures
2.1.3 Array electrical diagrams
2.1.4 Use of PCE with multiple d.c. inputs General PCEs with separate maximum power point tracking (MPPT) inputs PCEs with multiple inputs internally connected together in the PCE
2.1.5 Strings constructed using d.c. conditioning units
2.1.6 Series-parallel configuration
2.1.7 Batteries connected to systems
2.1.8 Considerations due to prospective fault conditions within a PV array
2.1.9 Considerations due to operating temperature
2.1.10 Performance issues
2.2 Mechanical design
2.2.1 General
2.2.2 Thermal aspects
2.2.3 Mechanical loads on PV structures
2.2.4 Mechanical loads—New Zealand only
2.2.5 Wind
2.2.6 Snow/ice accumulation
2.2.7 Corrosion
2.2.8 Additional requirements for PV modules mounted on vehicles
3 Safety issues
3.1 General
3.2 Protection against electric shock
3.3 Protection against overcurrent
3.3.1 General
3.3.2 Requirement for overcurrent protection
3.3.3 Overcurrent protection in PV systems connected to batteries
3.3.4 String overcurrent protection
3.3.5 Overcurrent protection sizing PV string overcurrent protection PV sub-array overcurrent protection General Small arrays Other arrays PV array overcurrent protection
3.3.6 Overcurrent protection location
3.4 Protection against earth faults
3.4.1 General
3.4.2 Systems with direct functional earthing of the PV array General Additional PCE detection required for functionally earthed PV arrays (see Appendix H)
3.4.3 Earth fault alarm (see Appendix H, Table H1)
3.5 Protection against effects of lightning and overvoltage
3.5.1 General
3.5.2 Protection against overvoltage
3.5.3 Surge protection devices (SPDs) General Surge protection devices (SPDs) d.c. Surge protection devices (SPDs) information technology equipment
4 Selection and installation of electrical equipment
4.1 General
4.2 PV array maximum voltage
4.3 Component requirements
4.3.1 General
4.3.2 PV modules General Operational conditions and external influences
4.3.3  PV array and PV equipment Environmental effects—General Environmental effects—Switch disconnectors—General Switch disconnectors with associated enclosures for outdoor installation General Protection against environmental effects  Switch disconnectors installed within PCE enclosures for shaded outdoor installations Switch disconnectors installed within PCE enclosures for exposed to sunlight outdoor installations Switch disconnectors for indoor installations Environmental effects—Other equipment Location of PV array and PV string combiner boxes
4.3.4 Circuit breakers
4.3.5 Disconnecting devices  General Switch-disconnectors Earth fault interrupters  Circuit breakers used as a disconnecting device
4.3.6 Cables Size Type Installation method General PV d.c. cables within buildings
4.3.7 Plugs, sockets and connectors
4.3.8 Fuses General Fuse holders
4.3.9 Bypass diodes
4.3.10 Blocking diodes
4.3.11 Power conversion equipment (PCE)
4.3.12 Small micro inverter installations
4.4 Location and installation requirements
4.4.1 Disconnecting means General  Disconnector for power conversion equipment (PCE) maintenance Installation Requirements for multiple disconnection devices PV disconnector (Australia only) PV array disconnector (New Zealand only)
4.4.2 Earthing and bonding arrangements General Earth connection of PV array exposed conductive part Protective equipotential bonding PV array protective bonding installation
4.4.3 Functional earthing of PV arrays General Functional earthing terminal of PV system PV system functional earthing conductor
4.4.4 Wiring system General Compliance with wiring Standards Segregation of circuits Wiring loops String wiring Wiring installation in junction and combiner boxes, and isolator/disconnector boxes
4.5 Commissioning
5 Marking and documentation
5.1 Equipment marking
5.2 Requirements for labels and signs
5.3 Labelling/signs for PV cables and enclosures
5.3.1 Wiring identification
5.3.2 Signs for PV array and PV string junction boxes
5.4 Fire emergency information
5.4.1 Voltage and current sign
5.4.2 Warning sign
5.5 Labelling/signs for disconnection devices
5.5.1 General
5.5.2 PV array disconnecting device
5.5.3 Shutdown procedure
5.5.4 Sign for systems over 600 V
5.6 Labelling of fuse holders
5.7 Documentation
Appendix A
Appendix B
B1 Examples of earthing system configurations
B2 D.C. disconnector voltage rating requirements
Appendix C
C1 Safety
C2 Periodic maintenance
C3 Operation and maintenance procedures
Appendix D
D1 General
D2 Commissioning tests
D3 PV array—D.C. voltage—Sample commissioning sheet
D4 Insulation resistance measurement
D5 Sample—PV array—Commissioning sheet
D6 Inspection requirements for a PV system (New Zealand only)
Appendix E
E1 General
E2 Open circuit voltage measurements
E2.1 General
E2.2 Procedure
E2.3 PV arrays and PV sub-arrays measurement
E2.4 Records
E3 Short circuit current
E3.1 General
E3.2 Procedure
E3.3 Records
E4 Infrared scan
E5 PV array tracker operation test (if relevant)
E6 PV array I-V curve
E7 Earth fault protection test (if relevant)
E7.1 General
E7.2 Measurements
E7.3 Procedure
Appendix F
F1 Lightning protection
F2 Application of an external LPS
F3 Choice of external LPS
F4 External LPS
F5 Earthing of external LPS
F5.1 General principle
F5.2 Earth resistance value
F6 Internal LPS—Surge protection
F7 Selection of SPDs installed at the d.c. side of the PV system
F7.1 General
F7.2 Selection of maximum continuous operating voltage VC
F8 Selection of SPDs appertaining to protection level VP and system immunity
F9 Earthing of SPDs
F10 Cross-section of connecting conductors to SPDs on the d.c. side of PV installations
F11 Screening and shielding
Appendix G
Appendix H
Appendix I
I1 General
I2 Worked examples
I2.1 Example 1: Selecting a switch disconnector for use with an isolated (separated) inverter
I2.2 Example 2: Selecting a switch disconnector for use with a non-isolated (non-separated) inverter
I2.3 Example 3: Selecting a switch disconnector for use with an isolated (separated) inverter
I2.4 Example 4: Selecting a switch disconnector for use with a non-isolated (non-separated) inverter
Amendment control sheet
Cited references in this standard
Low-voltage switchgear and controlgear, Part 1: General rules
EN 50521
Connectors for photovoltaic systems—Safety requirements and tests
Degrees of protection provided by enclosures (IP Code)
Low-voltage switchgear and controlgear, Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units (IEC 60947-3:2015 (ED. 3.2) MOD)
Structural design actions, Part 2: Wind actions
Content history
[Available Superseded]
[Available Superseded]