Who needs a three phase upgrade
A three phase upgrade suits Sydney homes running several heavy loads together, such as ducted air conditioning, a pool, an EV charger or a large solar system. When the supply itself cannot carry those loads at once, a bigger single phase board will not fix it, because the limit sits in the supply.
Board upgrade versus supply upgrade
A switchboard upgrade replaces the panel that splits power into circuits and protects them. A supply upgrade changes how much power reaches the home from the street. Three phase brings power in on three lines instead of one, so heavy appliances can be shared across them. Some homes need only the board; others need both.
The decision between single and three phase
The decision rests on what runs at the same time, not the size of the house. A home with gas cooking and one split system may sit comfortably on single phase with a modern board. Add ducted air, an induction cooktop and an EV charger, and three phase becomes worth assessing.
Distributor and Level 2 ASP steps
Changing the supply touches the network connection, so approval from the local distributor, Ausgrid or Endeavour Energy depending on the area, may be needed first. Service line and meter work is generally handled by a Level 2 Accredited Service Provider, while the board itself is wired by a NSW licensed electrician.
Three phase in heritage homes
Older terraces and federation homes across the Inner West and Eastern Suburbs can often still move to three phase. The care goes into where the meter box and new cabling sit, since changes affecting the street face or building envelope may need an exempt or complying development check before work starts.
Why the paperwork matters
A written home building contract is required once a residential job passes $5,000 including GST. Past $20,000, a valid HBC insurance certificate should be in hand before any deposit is paid or work begins. Once the new board is tested, you should receive a Certificate of Compliance for Electrical Work (CCEW) for your records.
Next step for your three phase plans
Write down what you run now and what you expect to add, with rough timing, such as an EV charger next year or a pool heater by summer. Once your plans are clear, you can request a three phase quote here, and a licensed and insured local contractor can follow up. Before then, check where your meter box sits and whether your home is heritage listed.
Three Phase Switchboard Upgrade Services We Offer
✓Single to Three Phase Conversion
Changing the incoming supply from one phase to three, with a board built to share heavy loads across all three.
✓Three Phase Board Replacement
Replacing an ageing board in a home that already has three phase supply, keeping the supply as it is.
✓Three Phase for EV Charging and Solar
Planning the supply and board around a home charger or larger solar system so both can run without overloading.
How it works
- 1
Assess the loads
List the appliances that run together now and those planned, so the supply can be sized to match rather than guessed.
- 2
Seek distributor approval
If the supply is changing, an application goes to Ausgrid or Endeavour Energy, depending on where the home is, before any connection work.
- 3
Supply and board work
A Level 2 provider handles the service line and meter while a NSW licensed electrician fits and wires the new three phase board.
- 4
Test and certify
The finished work is tested and a CCEW is lodged through the NSW eCert portal, with a copy given to the homeowner.