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AS/NZS 5033:2021 Installation and safety requirements for photovoltaic (PV) arrays

Standards Australia/Standards New Zealand

Version:  Fourth Edition 2021.  (Current)
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Supersedes: AS/NZS 5033:2014 Installation and safety requirements for photovoltaic (PV) arrays

Supersedes: AS/NZS 5033:2014 Amd 1:2018 Installation and safety requirements for photovoltaic (PV) arrays

Supersedes: AS/NZS 5033:2014 Amd 2:2018 Installation and safety requirements for photovoltaic (PV) arrays

Draft Designation: DR AS/NZS 5033:2021
Document Number

This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee EL-042, Renewable Energy Power Supply Systems and Equipment, to supersede AS/NZS 5033:2014.

AS/NZS 5033:2014 will also remain current for SIX MONTHS and after this time it will be superseded by AS/NZS 5033:2021. Regulatory authorities that reference this standard in regulation may apply these requirements at a different time. Users of this standard should consult with these authorities to confirm their requirements.

The objective of this document is to address the safety requirements arising from the particular characteristics of photovoltaic systems. Direct current systems, and photovoltaic arrays in particular, pose hazards in addition to those derived from conventional a.c. power systems, including the ability to produce and sustain electrical arcs with currents that are not greater than normal operating currents.

At the time of publication there were limited Standards for arc detection and prevention for PV arrays. As standards develop, there will be a revision of this document, which will require the use of this technology for PV arrays.

Many new protection features for arrays when used in grid connected applications will be implemented in inverter systems and are required by the International Standard for inverters — IEC 62109-2. Both this document and AS/NZS 4777 require inverters that conform to IEC 62109-2 for grid connected PV systems.

There are a number of changes in requirements in this revision. They include but are not limited to —

(a) change in the scope of this document with respect to maximum PV array power limit;
(b) additions of provisions relating to d.c. conditioning units regarding voltage and current calculations;
(c) changes to requirements for overcurrent protection and earthing;
(d) changes to methods of PV isolation including for d.c conditioning units;
(e) changes to requirements for wiring systems and connector requirements;
(f ) new signs, verification and commissioning requirements.

This document necessarily deals with existing types of systems but is not intended to discourage innovation or to exclude materials equipment and methods that may be developed in the future.

Revisions will be made from time to time in view of such developments, and amendments to this edition will be made when necessary.

The author thanks the International Electrotechnical Commission (IEC) for permission to reproduce Information from its International Standards. All such extracts are copyright of IEC, Geneva, Switzerland. All rights reserved. Further information on the IEC is available from IEC has no responsibility for the placement and context in which the extracts and contents are reproduced by the author, nor is IEC in any way responsible for the other content or accuracy therein.

Statements expressed in mandatory terms in Notes to Tables and Figures are deemed to be requirements of this document.

The terms “normative” and “informative” have been used in this document to define the application of the Appendix to which they apply. A “normative” Appendix is an integral part of a document, whereas an “informative” Appendix is only for information and guidance.

AS/NZS 5033:2021 sets out general installation and safety requirements for electrical installations of PV arrays, including d.c. array wiring, electrical protection devices, switching and earthing provisions. Originated as AS/NZS 5033:2005. Previous edition 2014. Fourth edition 2021.


1: Scope And General
2: PV Array System Configuration
3: Safety Issues
4: Selection And Installation Of Electrical Equipment
5: Marking
6: System Documentation And Commissioning
Appendix A: (Informative) Example Of Signs
Appendix B: (Informative) Earthing And D.C. Fault Conditions
Appendix C: (Informative) Non-Separated Inverter Fault Current Paths
Appendix D: (Informative) Maintenance Recommendations
Appendix E: (Informative) Testing And Commissioning Checklists
Appendix F: (Informative) Additional Commissioning Tests
Appendix G: (Informative) Lightning Protection
Appendix H: (Informative) Examples Of Calculations For Determining Suitable Voltage, Thermal Current, Operational Current And Making And Breaking Current For Switch Disconnectors
Appendix I: (Normative) Fire Tests, Spread Of Flame And Burning Brand Tests
Appendix J: (Normative) Determination Of Safety Factor (SF) Multiplier And K For ISC MOD For Bifacial Installations
Appendix K: (Normative) Protection Against Weather And Water For Dedicated Individual Enclosures Containing Switch Disconnectors


EL-042 Renewable Energy Power Supply Systems and Equipment.

Australasian Fire and Emergency Service Authorities Council; Australian Energy Council; Australian Energy Market Operator; Australian Industry Group; Australian PV Institute; Better Regulation Division (Fair Trading, Safework NSW, TestSafe); Clean Energy Council; Clean Energy Regulator; Communications, Electrical and Plumbing Union— Electrical Division; Consumer Electronics Suppliers Association; Consumers Federation of Australia; CSIRO; Electrical Compliance Testing Association of Australia; Electrical Regulatory Authorities Council; Electrical Safety New Zealand; Electricity Engineers Association of New Zealand; Energy Efficiency&Conservation Authority of New Zealand; Energy Networks Australia; Engineers Australia; Fire and Emergency New Zealand; Institute of Electrical Inspectors; Institute of Electrical and Electronics Engineers; Joint Accreditation System of Australia&New Zealand; Master Electricians Australia; National Electrical and Communications Association; Office of the Technical Regulator (SA); Smart Energy Council; Solar Energy Industries Association; Sustainable Electricity Association New Zealand; University of New South Wales; Vector; Wellington Electrical Association; WorkSafe New Zealand.

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