Under Australian and NZ Standard 3000:2018, installation wiring rules have changed with regard to the use of Residual Current Devices (RCDs). The change stipulates that all electrical installations after May 1, 2023 must no longer use Type AC RCDs.
Instead, Type A RCDs – certified to AS/NZS 61008 or 61009 – must be installed as a minimum for tripping. Type B RCDs also meet the standard.
What does this apply to?
The change applies to all new electrical installations. But it could also affect some existing ones – such as jobs involving replacements of faulty RCDs, switchboard upgrades or repairs/alterations that involve putting in new circuits. New installations of Type AC RCDs will no longer be compliant, which could lead to fines and penalties. However, there is no requirement at this stage to go out and replace all existing Type AC devices.
Why this change?
The way we are using electricity is changing. Modern electrical equipment is increasingly using Direct Current (DC). This includes dishwashers, washing machines, inverters (e.g. for solar PV), EV charging stations and LED lighting. This creates extra risk with regard to safety (e.g. leaking, electric shocks, fires) and equipment damage from DC faults. Type A RCDs ensure tripping for both residual AC currents and pulsating DC currents. They are therefore considered necessary to protect circuits that contain both AC and DC components.
Traditional Type AC devices do not detect DC. As their name suggests, they only detect AC currents. So, in essence the change is being made to protect people, electrical equipment, and property as we move through the energy transition.
What about Type B RCDs?
The most suitable replacement for Type AC in most cases is likely to be Type A. However, in some settings, Type B might be warranted. Type B RCDs have the same features as Type A, plus tripping for smooth DC currents. As they offer additional sensitivity and protection, Type B may be required for commercial or apartment EV-charging environments, industrial settings or medical facilities – anywhere a higher level of protection is called for.
In such cases, the higher protection offered helps ensure greater reliability and performance of equipment and could save money that would otherwise go into repair and maintenance costs.
What to do next?
Electrical contractors are responsible for installing the most suitable safety switches for the jobs they undertake. Contractors may need to review projects to ensure that those carried out after May 1, 2023 meet the new requirements for RCDs. It’s also crucial when purchasing new RCDs to check they are marked with the Regulatory Compliance Mark (RCM) or an approval number that shows they are compliant.
Only devices marked as approved or compliant can be legally used in new wiring jobs – these include circuit breakers made by Schneider Electric. Schneider Electric is actively involved in shaping standards and ensuring safe, energy efficient electrical installations.
Protect your clients, their equipment and your reputation by purchasing compliant RCDs. Shop for Schneider online at Blackwoods.
