Wollongong, Illawarra & Shoalhaven 24/7 emergency call-outs Lic. 404250C
COASTELECTRICAL CO

25 August 2025 · Jade Bruce · 2 min read

Getting a split system? The electrical side explained

Buying the air-con is the easy part. Making sure it's wired properly is what keeps it running for years, and keeps your safety switch from tripping on hot afternoons.

We service a large area including Wollongong, the Illawarra and Shoalhaven regions, including Nowra, Kiama, Helensburgh & surrounding regions. See all areas we cover

Does it need its own circuit?

Small split systems can sometimes run from an existing circuit, but most larger units need a dedicated circuit straight from the switchboard. It means the air-con isn't competing with the kettle and the oven on a 40-degree day.

The outdoor isolator

The outdoor unit needs an isolating switch next to it, so it can be safely switched off for servicing. On the coast, that isolator should be a quality weather-rated one, as they're a common failure point.

Check the switchboard first

A new circuit needs space and capacity in the board. Older boards with ceramic fuses often can't take one without an upgrade. We check before the install day, so there are no surprises.

Coordinating the installer

Many air-con installers handle the refrigeration side and leave the electrical to an electrician. We work with your installer, or with the unit you've bought, and get the circuit ready before they arrive.

Ducted systems

Ducted air-con draws more power again and often needs a bigger circuit. It's worth planning early, especially in a renovation or new build.

Need an electrician in Wollongong, the Illawarra or Shoalhaven? Get a free, fixed-price quote or call Jade on 0402 273 820.

Need an electrician you can rely on?

Call or text Jade directly, or send the job details for a free, fixed-price quote.