Who a three phase upgrade suits
A three phase upgrade changes how power reaches your home, from one active supply to three, and the switchboard is rebuilt to share circuits across them. It tends to suit Adelaide homes planning several heavy loads together, such as ducted air conditioning, a home EV charger and a larger solar or battery system.
How single and three phase compare on the switchboard
On single phase, every circuit draws from one supply. On three phase, the board gets a main switch and protection for three supplies, and circuits are spread so no single phase carries everything. Some larger equipment, such as bigger chargers or ducted units, can be connected across all three phases directly.
Why three phase is a decision, not a default
Plenty of homes cope on single phase with a larger board or load management. Three phase adds work at the supply, the meter and the board, so weigh the loads you are adding now against what you expect over the next few years before committing.
Your bill and supply questions answered
The number of phases does not make appliances use more energy, so usage still comes down to what you run. Retail tariffs and supply charges can differ on three phase, so check your plan. Whether three phase can reach your street depends on the local network and is confirmed by SA Power Networks, not assumed.
What network coordination involves
Changing the supply is network work as well as board work. SA Power Networks needs to approve the change, and the new service connection or metering may need to be arranged on their schedule. The switchboard work is then timed around that connection, which is why dates can depend on the network rather than the board alone.
Next step for your three phase plan
Open the meter box and note whether you see one main switch or a three pole switch, then write down your suburb and each large load driving the change. A licensed and insured local contractor can follow up once you request a quote here.
Three Phase Switchboard Upgrade Services We Offer
✓Single to Three Phase Conversion
Changing the home's supply from one phase to three, with the network connection and a new board to suit.
✓Three Phase Board Replacement
Replacing an older board on a home that already has three phase supply, rebalancing circuits for current loads.
How it works
- 1
List the loads
Write down what is pushing you towards three phase, such as ducted air, an EV charger or a bigger solar system, and any plans for the next few years.
- 2
Compare the options
Weigh three phase against staying on single phase with a larger board or load management, including any tariff difference on your electricity plan.
- 3
Confirm the network side
The supply change is applied for with SA Power Networks, which confirms whether three phase can reach your street and schedules the connection.
- 4
Fit the new board
The switchboard is replaced with three phase protection, circuits are balanced across the phases and the new supply is connected and tested.