The cheaper option when installing air conditioning is to hardwire the aircon unit directly to the switchboard. While doing this still meets industry standards, we see it as a shortcut.
We put isolator switches onto the outdoor units when we install home air conditioning for two reasons. Firstly, it means you can disconnect your unit to protect it from strikes in a storm.
Secondly, it means you can prevent your home safety switch from repeatedly tripping if your air conditioning system has a fault. In this case, the power supply to the unit can easily be disconnected using the isolator switch, until your local electrician is available to repair it — and you can still enjoy normal power in the meantime.
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