AS/NZS 4777.1.2024 Now available to view on our TKB!

New Signage, Safety, and Verification Requirements in AS/NZS 4777.1:2024

The latest update to the AS/NZS 4777.1:2024 Grid connection of energy systems via inverters standard introduces significant changes for residential solar installations, with one of the most notable being the new ‘1000V rule’.

Ever since the introduction of AS/NZS 5033:2021 Installation and Safety Requirements of Photovoltaic (PV) Arrays, solar installers have been asking the question whether they can configure their PV arrays in domestic installations up to 1000 volts.

With the long-awaited revision of AS/NZS 4777.1.2024, Clause 4.3.2 confirms that installers can configure their PV arrays up 1000V. This change now allows installers to implement higher voltage solar systems in residential settings, but only if they strictly adhere to the updated compliance requirements.

The higher voltage opens new possibilities for domestic installations including more efficient and larger PV arrays. This can result in fewer strings and components, with cost savings and improved performance for installations.

However, using the 1000V rule is not just a simple switch to higher voltage. It comes with strict compliance obligations that must be met. These include updates to safety measures, such as:

• New signage requirements (Section 6 + Appendix A): This is particularly important if it is a battery installation because the inverter main switch needs to have the appropriate supply type (alternative vs. independent) specified. 
• Installation verification (Section 8): The new standard requires detailed installation checks, including enhanced verification processes to ensure systems meet the revised safety criteria.
• Protective devices and phase balance (Section 3 + Appendix C): Installers must also update protective devices to handle higher voltages, and manage phase balance requirements to ensure the stability of the power supply.

Important note for solar installers:

Solar installers should note that if they decide to use one part of the new standard, then they must use it all.  Failure to follow these requirements could lead to safety risks and non-compliance, putting installers at risk of fines or system failures.

ECA WA Members can now view AS/NZS 4777.1.2024 on our TKB!

ECA WA Members can view the updated standard here on our TKB.

Need help accessing the TKB? Email tkb@ecawa.org.au or call (08) 6241 6100. 

Looking to learn more?

GSES (Global Sustainable Energy Solutions) have developed an online short course for installers outlining the new requirements, which is eligible for 20 CDP points with SAA.