What Changes in a Three-Phase Upgrade: Switchboard, Mains & Metering

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Signed off on going three-phase and wondering what the electrician actually does? A three-phase upgrade is more than swapping a meter — it touches your consumer mains, your switchboard and main switch, and your metering. This is the plain-English breakdown of what changes in a three-phase upgrade (including the three-phase switchboard upgrade at the heart of it), and why the whole job is Level 2 ASP work.

👉 See our single-phase to three-phase upgrade service →

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What actually changes

Going from single- to three-phase means bringing three active conductors into your home instead of one, and reworking everything that carries or distributes them. In practice that's three connected pieces of work: your consumer mains, your switchboard and main switch, and your metering. Here's each one.

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1. Consumer mains become three-phase

Your consumer mains — the cables running from your point of attachment (or pit) to your main switchboard — are replaced with a correctly sized three-phase set. This is the backbone of the upgrade: it's what physically delivers all three phases from the network connection into your board, whether your supply is overhead or underground.

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2. A three-phase switchboard and main switch

This is the core of the job. Your switchboard needs a three-phase main switch and the busbars and capacity to distribute three phases across your circuits. In most homes this means a switchboard upgrade or full rebuild — especially if you still have an older board with ceramic fuses or an asbestos backing panel, which are replaced with a modern board, proper RCDs and clear circuit labelling. A tidy, compliant three-phase board is what makes everything downstream safe and expandable.

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3. Three-phase metering

Your single-phase meter is replaced with a three-phase smart meter, which measures usage across all three phases. This step is booked through your energy retailer's metering provider and coordinated with the upgrade, so the new supply is metered correctly from day one.

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4. Balancing your circuits across the phases

With three phases available, your electrician can spread big loads — oven, aircon, EV charger, pool — across the phases rather than piling them onto one. This balancing is a large part of why three-phase runs big loads more smoothly and avoids the nuisance tripping of an overloaded single-phase board.

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Why it's Level 2 ASP work end to end

Every part of this touches the supply side of your electrical system — the consumer mains, the point of attachment and the metering connection to the network. That's the exclusive domain of an accredited Level 2 ASP, who is licensed to disconnect and reconnect your property to the network, lodge the connection application, and certify the work. It's not something a general electrician (without Level 2 accreditation) can complete. For the sequence and timing, see how long a three-phase upgrade takes.

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How High Demand Electrical helps

As a Level 2 ASP electrical contractor (Licence No. 397193C), we do the entire single-phase to three-phase upgrade in-house — consumer mains, the switchboard upgrade, metering coordination, network application and energisation — as one certified job. Not sure it's needed? Check whether your home can get three-phase and whether it costs more to run first.

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