Sydney is the largest city in Australia. Because of its size, many people assume that Sydney is Australia’s capital. While Sydney is the capital of New South Wales, the capital of Australia as a continent is Canberra. As of 2020, the population of Sydney is estimated at 4.9 million residents. Sydney is a very modern and global city with a lot of tourists visiting per year to bask at the architectural wonders, such as the Sydney Harbour Bridge and the Sydney Opera House.
Sydney is also governed by strict rules and regulations, especially when it comes to the safety of its residents. One regulation that Sydney is strict on is the tinkering and repairs of home electrical wirings only by a qualified Sydney electrician.
The Harm of DIY Home Electrical Repairs
An ordinary person who opens up an outlet or light switch box may get confused with the different arrays and colours of electrical wires. Cutting or handling the wrong wire may short circuit your home’s electrical system or, worse, cause severe harm or death. Since Australia uses 240 volts for its electrical appliances, this voltage running in the body is extremely harmful and fatal. A qualified Sydney electrician can determine the purpose of each wire and correctly repair any electrical problems at home.
Electrical Cable Colour and Wire Colour Markings
Each country has its standards in electrical wiring systems for residential and commercial units. In Australia, the cable colours and colour markings are guided and regulated by the AS/NZS 3000:2018 Electrical Installations or Wiring Rules. The standards for colour coding schemes of electrical wirings depend on the type of phase electrical wiring required.
- Single Phase
The Single-phase power wiring is a two-wire alternating current power circuit. In this wiring, one wire is the power wire (also known as the phase wire), while the other serves as the neutral wire. Single-phase circuits are commonly used for typical home wiring for lighting or heating.
For single-phase circuits, the current Australian Wiring Rules dictate the use of the following colour codes:
- Active Wires: Active wires or hot wires are those that come from the power source. Australia Wiring Rules of 2018 has changed the colour code of single-phase active wires from Red into Brown. Homes that were wired before 2018 may still contain red active wires.
- Neutral Wires: Neutral wires for single-phase circuits must be light blue. However, wiring done before 2018 used black wires for neutral.
- Earth Wires: Earth wires or ground wires for single-phase systems can be green or yellow. Ground wires before 2018 also used green colour codes.
- Three Phase
Three-phase power wiring is commonly used for commercial and industrial facilities. Three-phase systems use three-wire AC power circuits that could accommodate higher and more consistent loads.
- Phase 1: Since 2018, the colour for phase 1 wires has been changed from red to brown.
- Phase 2: Phase 2 wires are also considered active or hot wires and are assigned black colour. Before 2018, the colours for phase 2 wires used to be white.
- Phase 3: Phase 3 wires should be grey according to Australian Wiring Rules. This colour was changed from dark blue to grey.
- Neutral Wires: Neutral wires must be light blue.
- Earth Wires: Similar to single-phase systems, earth wires for multi-phase systems also use green or yellow colour codes.
Since colour codes for wiring vary from one country to another, it is important always to hire a professional Sydney electrician to work on any electrical difficulties you may have in your Australian homes.