19 November 2018
As of the 1st of January 2019, the AS/NZS 3000:2018 Wiring Rules are now mandatory in Australia (late 2019 in New Zealand), including some important changes to isolator requirements.
Below is a summary of the recent changes around the installations of air conditioning, water heater and heat pump systems, along with the required use of isolators in their circuits. For a complete understanding of all requirements always consult the standard.
Some of these new requirements include (but are not limited to) the following:
126.96.36.199 – Isolators for fixed wired water heaters
Shall be provided with an independent lockable isolator in accordance with 188.8.131.52 and shall be installed adjacent to but not on the unit.
4.19 – Air conditioning and heat pump systems incorporating a compressor
Also, shall be provided with an independent lockable isolator in accordance with 184.108.40.206, and shall be installed adjacent to, but not on the unit.
For air conditioning systems (including room heaters incorporating a compressor) where the internal unit(s) are supplied separately from the compressor without the use of plug and socket (i.e. fixed wiring), an independent lockable isolator in accordance with 220.127.116.11, and the addition of warning sign requirements, shall also be installed adjacent to, but not on the unit.
18.104.22.168 – Devices for isolation. Lists the requirements for isolator switches, which NHP's N-Line Isolator large body range is compliant to. Features such as high withstanding capability, clearly indicated ON and OFF positions, and two-pole switching are an integral part of these requirements.
The N-Line large body range is available in lockable versions with current ratings of 20A and 40A with a large handle for easy operation. A 2-pole mechanism as a standard for single phase models and a TPE injected gasket combined with stainless steel cover screws providing ingress protection up to IP66 for outdoor applications.