10A, 15A, or 3-Phase? The Commercial Kitchen Power Trap Costing Operators $16,500
The blunt truth: a 10-amp residential plug cannot run an industrial kitchen. If your $18,000 combi oven and pass-through dishwasher arrive at a site whose switchboard isn't sized for them, you are not looking at a delivery delay. You are looking at a $12,500 infrastructure quote from your energy network operator, a 6 to 8 week wait for the upgrade, and a daily $250 rent bleed during your "soft opening" — which now has no opening, no revenue, and a roster of staff being paid to stand around.
This is the single largest avoidable cost in an Australian commercial kitchen fit-out. And it is almost always triggered by one decision: signing the lease before checking the switchboard.
The decision matrix below is what a licensed electrician will tell you in 90 seconds if you ask. We've laid it out in advance because the cost of not asking sits between $4,000 and $25,000 depending on your network operator (Ausgrid, Essential Energy, Energex, Powercor, SA Power Networks) and the existing capacity on your street.
The 60-second power profile — read this first
| Site type | Typical cooking line | Minimum power profile | Risk if under-spec |
|---|---|---|---|
| 10–20 seat espresso cafe | 2-group machine, sandwich press, 4-tray combi | Single-phase, 63A main, 2× 15A dedicated circuits | Combi steam cycle trips during morning rush |
| 40+ seat brunch venue | 3-group machine, 6-tray combi, underbench dishwasher | 3-phase, 32A per phase minimum | Dishwasher thermal-holds; front of house runs out of crockery |
| QSR / takeaway | Twin-tank fryer, salamander, ducted fridge bank | 3-phase, 40A per phase | Fryer recovery blows out; holding waste spikes food cost |
| Full restaurant (60+ seats) | 6-burner gas + electric oven, pass-through dishwasher, combi, salamander | 3-phase, 63A+ per phase | Main breaker trips mid-dinner service |
| Production bakery | Deck oven, planetary mixer, retarder-proover | 3-phase, 80A+ per phase | Deck oven can't hold setpoint; entire batch loss |
If your site is below the minimum profile for the kitchen you're planning, you have three options: upgrade the switchboard (expensive, slow), downsize the equipment (compromises throughput), or walk away from the lease. There is no fourth option that doesn't involve daisy-chained extension leads, tripped breakers, and a fire risk that voids your building insurance.
The rest of this guide explains exactly how each of those numbers breaks down, what a real fit-out disaster timeline looks like week by week, and the five-step audit you can run yourself before signing anything.
Section 1 — The $16,500 Phase Collapse Timeline
Here is a real-world chronology of a CBD cafe fit-out that went sideways. Names removed, numbers kept honest. This is not a worst case. It is a typical case.
Monday — Delivery day
A premium German pass-through dishwasher ($8,200 ex GST) and a 10-tray combi oven ($10,300 ex GST) arrive on a tail-lift truck. Total asset value on the floor: $18,500 plus freight and insurance. The operator has paid a 50% deposit and is locked into delivery. The remaining 50% is owed within 7 days. The equipment is sitting in the kitchen, still on pallets, unwrapped, manuals in plastic.
Tuesday — The electrician's verdict
A licensed electrician arrives to commission the equipment. He opens the sub-board. The site allocation is single-phase, capped at 63 amps total. The combi oven alone draws 28 amps per phase when configured on a 3-phase 415V supply (around 19 kW peak load). On single-phase, that same combi cannot run at all — its element bank is wired for 3-phase distribution. The dishwasher's heating element wants 15 amps on a dedicated circuit; the existing kitchen sub-board has one 10-amp general purpose outlet and no spare way on the busbar.
The electrician's report runs to two pages. The headline number is the one the operator didn't want to hear: this site cannot energise either piece of equipment without a switchboard upgrade and a service main upsize from the network operator.
Wednesday — The price shock
The network operator (in this case, Ausgrid) issues an infrastructure quote. To bring 3-phase 415V from the street pit to the new metering position: $12,500 plus GST. New CT-metered switchboard, mains tail upgrade, and meter swap by an accredited service provider: $4,000. Lead time to energise: 6 to 8 weeks. The quote is valid for 30 days. The operator has 30 days to accept, pay a deposit, and join a queue.
This is the moment the fit-out budget tips over. The original electrical allocation in the build cost was $6,000. Actual electrical spend is now tracking past $22,500.
Thursday — The compromises start
To open in something resembling the original schedule, the operator considers downgrading. A smaller 6-tray single-phase combi at half the capacity. A 10-amp underbench dishwasher instead of the pass-through. The supplier waives part of the restocking fee but charges $1,800 in admin and freight on the swap. The smaller combi reduces peak menu output by roughly 35%, which means the catering side of the business — which was meant to underwrite the dine-in losses for the first 6 months — is now constrained.
Friday — The bleed
The opening date slips by 5 weeks while the switchboard upgrade is scheduled. Rent has been running since the previous month's handover: $250 per day on a CBD site (small site, this is conservative). Roster commitments to two chefs and three FOH staff were signed in good faith and cost roughly $4,200 a week to honour or terminate. Zero revenue across that window. The marketing launch — paid social, opening week influencer pack, local press — is paused and partially re-shot.
Total preventable cost, conservative: $16,500. The number can run to $25,000 once you include the equipment swap, the schedule slip, and the marketing rework. We've seen this story land at $40,000+ for full restaurant fit-outs in regional sites where the network operator quote was over $20,000.
Every dollar of this was avoidable on the day the lease was signed.
Section 2 — Single-Phase vs Three-Phase: The Physics in Plain English
Most operators glaze over when an electrician starts talking about phases. The concept is genuinely simple if you skip the textbook diagrams.
Single-phase 240V is like a single-cylinder engine. Power arrives in pulses, 50 times per second in Australia. For low-draw appliances — a kettle, a domestic oven, a coffee grinder — it's plenty. For heavy inductive loads with big heating elements or wash pumps drawing hundreds of amps of inrush current, single-phase voltage sags every time the load kicks in. You see this as flickering lights, slow recovery, tripped breakers, and equipment running below its rated capacity.
Three-phase 415V is three cylinders running 120 degrees out of step. Power delivery is continuous rather than pulsed. Large motors and element banks can be wired across the three phases so that no single phase has to carry the whole load. The result: smaller cable sizes for the same delivered power, lower copper losses, and far more stable voltage under heavy switching. Every piece of commercial kitchen equipment over about 7.5 kW continuous draw is designed around 3-phase distribution for this reason.
The maths layer, if you want to check your electrician's calculation: single-phase current draw is power divided by voltage (I = P ÷ V). Three-phase current draw is power divided by root-three times voltage times power factor (I = P ÷ (√3 × V × PF)), where power factor for commercial kitchen loads sits around 0.85. The square-root-of-three term is why a 20 kW load that would need 83 amps on single-phase only needs 33 amps per phase on 3-phase — the load is shared.
Worked example: the same combi oven on different supplies
| Supply | Voltage | Combi rating | Current draw per phase | Practical viability |
|---|---|---|---|---|
| Single-phase domestic | 240V | Cannot wire — element bank is 3-phase | N/A | Will not energise |
| Single-phase commercial | 240V | Up to ~7 kW model | ~30A | Limits you to 6-tray or smaller |
| 3-phase 32A per phase | 415V | 10-tray, ~19 kW | ~31A | Standard 10-tray combi territory |
| 3-phase 63A per phase | 415V | 20-tray bank or twin combi | ~40A | Production / bank kitchen |
The point of the worked example is not the arithmetic. The point is that the same nominal power rating can sit on completely different supply types, and the spec sheet of the equipment you're about to buy tells you exactly which one your site needs. If your electrician hasn't read the spec sheet against your switchboard before the order is placed, the order is being placed blind.
Section 3 — The 10A vs 15A Dishwasher Trap (Thermodynamic Recovery)
The dishwasher is where most operators get caught. The 10-amp general purpose outlet (GPO) looks identical to a 15-amp outlet to the untrained eye. The 15A plug has a larger earth pin and will not fit into a 10A socket — by design, because the wiring behind the wall is rated for a different load. This is also the rule that makes 10A-to-15A "converter" adapters a serious offence under AS/NZS 3000:2018 wiring rules: they trick the appliance into drawing a current the circuit was never designed to carry, which is how you get a hot wall, a melted GPO, and an insurance claim that gets denied.
The physics underneath is unforgiving. A 10-amp circuit at 240V has a theoretical maximum of 2,400 watts. In practice you derate this to about 2,200 watts continuous to leave margin for inrush and starting current. That 2,200 watts has to do two jobs in a dishwasher: heat the rinse water to the food-safe sanitisation threshold, and run the wash pump that circulates detergent during the cycle. It cannot do both at the same time.
The 82°C threshold is non-negotiable
FSANZ Food Standards Code Standard 3.2.2 sets the sanitisation threshold for commercial dishwashing at 82°C final rinse for a minimum dwell time — this is what your local council EHO checks when they swab a clean plate. A 10-amp underbench machine cannot heat rinse water to 82°C while the wash pump is running. It cycles: heat, hold, pump, heat again. During peak service this manifests as the "thermal hold" — the machine pauses mid-cycle to recover rinse temperature, often for 8 to 15 minutes. The cycle time effectively doubles.
The operational consequence
Picture Saturday brunch. Two hundred covers between 9 am and noon. Each cover uses approximately 4 pieces of crockery, 2 pieces of cutlery, and a coffee cup. That's 1,400 items through the dishwasher in three hours. A 10-amp machine running 90-second cycles at full pace can manage roughly 30 racks per hour, or about 480 items — barely a third of what you need. When the thermal hold kicks in, that throughput drops to 15 racks per hour and the front of house starts pulling glassware out of storage tubs.
Two visible symptoms emerge. First, tables turn slower because customers are waiting for clean cutlery. Second, your staff start washing items by hand at the prep sink — which itself is not certified as a sanitisation point and will fail an EHO audit if observed. The dish pit becomes the bottleneck for the whole service.
What 15-amp and 3-phase fix
A 15-amp commercial machine has roughly 3,600 watts available. With a properly sized heating element and a separate booster heater, the machine can hold rinse temperature while the wash pump runs continuously. Cycle times drop to 60 to 90 seconds and stay there. A 3-phase pass-through goes further: parallel element firing across multiple phases means the booster heater, the wash heater, and the wash pump can all run at full power simultaneously without overloading any single phase. Cycle times go to 45 to 60 seconds, and a commercial pass-through can clear 60 to 90 racks per hour — enough for a 120-cover lunch service without breaking sweat.
The premium for the 15-amp or 3-phase machine over the 10-amp underbench is typically $1,500 to $4,000 at the equipment level. The cost of running a 10-amp machine in a venue that does more than 80 covers a day is measured in lost table turns and EHO audit risk, and it accrues every single trading day.
Section 4 — The Commercial Lease Power Trap
The hidden assumption in most kitchen fit-outs is that any property zoned commercial automatically has commercial-grade electrical infrastructure. This assumption is wrong often enough that we now consider the switchboard audit a mandatory step before lease signing — ahead of the kitchen layout, ahead of the equipment list, ahead of the colour palette.
Where it goes wrong
The most common trap is the sub-let or arcade tenancy. A landlord buys a strip retail building with a single 80A or 100A main feed from the street. Over time, the building gets subdivided into four or five tenancies. The landlord runs sub-mains from a common distribution board to each tenancy. The original mains cable from the street is never upgraded. By the time a fourth or fifth tenant moves in, the available capacity per tenancy is closer to 20A than 80A. The lease document says "tenancy in commercial premises." The switchboard says you have one residential-grade general circuit and a hot water line.
The second trap is older standalone buildings. A 1970s shop fit with a 63A two-pole main and no provision for 3-phase. You can absolutely run a small cafe out of it. You cannot run a full commercial kitchen out of it without an upgrade from the network operator — and the network operator may quote four months of lead time depending on the queue at your local zone substation.
The five-step pre-flight switchboard audit
- Read the main switch rating. Open the meter box. The main isolator switch will be labelled with its current rating: 63A, 80A, 100A, 125A, or higher. This is the absolute ceiling of what your tenancy can ever draw without an upgrade. Photograph it.
- Count the phases at the meter. Single-phase meters have one or two current transformer ports. Three-phase meters have three. A three-phase meter does not automatically mean you have three-phase capacity at the kitchen sub-board — the run between the meter and the sub-board may be single-phase only.
- Locate the kitchen sub-board and count spare ways. Each circuit breaker on the sub-board is a "way." You need at least one spare way per heavy appliance you plan to install. If the sub-board is full, you need a sub-board upgrade before you can add equipment, regardless of how much spare capacity exists at the main.
- Ask the landlord for the most recent electrical compliance certificate. Every commercial property should have one. If the landlord cannot produce it, treat this as a significant red flag and budget for a full re-test as part of fit-out.
- Get a licensed electrician to run a one-hour site assessment before you sign the lease. Cost: $250 to $400. Compared to the $16,500 timeline above, this is the cheapest insurance policy in the building.
Three questions for the leasing agent
Before signing, ask in writing: (1) What is the current amp rating of the tenancy main switch? (2) Is 3-phase 415V available at the existing sub-board, and if not, at what cost can it be brought in? (3) Has the property had an AS/NZS 3000:2018 compliance inspection in the last 5 years, and can you provide a copy of the certificate? The wording of the answers tells you whether the agent has dealt with commercial kitchen tenants before or whether you are about to educate them.
If the answers come back vague or evasive, the site is a higher fit-out risk. This is not a deal-breaker — many fit-outs run successfully through marginal sites — but the risk must be priced into your build cost. Add a contingency of 30% of the electrical line item if any of the three answers is unclear. Set up your stainless steel benches and cooking suite layout against the commercial benching range only after the electrical envelope is confirmed; redesigning a kitchen layout around an unexpected sub-board location is one of the more expensive corrections in a fit-out.
What you pay, by state and network operator
The infrastructure cost of bringing a 3-phase supply to a previously single-phase site is set by the network operator that owns the poles and wires in your area, not by your electrician or your landlord. Each network operator publishes its connection fee schedule and runs to its own lead-time queue, and the variation across the country is significant enough that the same upgrade quoted in Sydney can be half the price or twice the price in Adelaide.
The figures below are indicative ranges for a standard low-voltage 3-phase connection upgrade on an existing site, not a new estate connection. Get a written quote for your specific site before committing to equipment.
| State | Network operator | Typical 3-phase upgrade range | Typical lead time | Notes |
|---|---|---|---|---|
| NSW (Sydney metro and east) | Ausgrid | $8,000 – $18,000 | 6 – 10 weeks | Inner-city sites with shared mains can run higher if mains tail upgrade required |
| NSW (regional and west) | Essential Energy | $10,000 – $25,000 | 8 – 14 weeks | Longer runs to street pit; transformer capacity often the bottleneck |
| NSW (Sydney south and Illawarra) | Endeavour Energy | $8,000 – $20,000 | 6 – 12 weeks | Comparable to Ausgrid in metro pricing |
| QLD (Brisbane and SEQ) | Energex | $6,500 – $16,000 | 4 – 8 weeks | Generally faster turnaround than NSW for standard upgrades |
| QLD (regional) | Ergon Energy | $9,000 – $22,000 | 8 – 16 weeks | Regional sites can require pole or transformer upgrade — significantly more |
| VIC (Melbourne west) | Powercor / United Energy | $7,000 – $17,000 | 6 – 10 weeks | CitiPower covers Melbourne CBD with similar pricing |
| VIC (Melbourne east and inner) | CitiPower / Jemena | $7,500 – $18,000 | 6 – 12 weeks | Heritage building constraints can extend timelines |
| SA | SA Power Networks | $8,000 – $19,000 | 6 – 12 weeks | Single network operator across the state simplifies process |
| WA (Perth and SW) | Western Power | $9,000 – $22,000 | 8 – 14 weeks | Standalone power systems in remote sites are a separate process |
| TAS | TasNetworks | $8,000 – $18,000 | 6 – 10 weeks | Mainland-equivalent process and pricing |
| NT | Power and Water Corporation | $10,000 – $25,000+ | 10 – 16 weeks | Limited supplier pool; remote sites significantly higher |
| ACT | Evoenergy | $8,000 – $18,000 | 6 – 10 weeks | Comparable to Ausgrid in pricing and turnaround |
Three patterns are worth pulling out of the table. First, lead times are rarely under 4 weeks anywhere in Australia for a 3-phase upgrade; if your network operator promises a faster turnaround in writing, get a named contact at the operator on the email chain. Second, the regional premium is real — sites outside metro service areas routinely cost 50 to 100% more for the same upgrade because of longer mains runs and queue priority. Third, the network operator's quote is an infrastructure-only cost; you also need an accredited service provider to install your new switchboard, which typically adds $2,500 to $6,000 on top depending on board complexity.
The practical takeaway is this: if you are evaluating a site that needs a 3-phase upgrade, the network operator quote determines your earliest possible opening date, not your equipment lead time. Treat the quote as the critical-path item.
For sites planning an electric cooking line, the equipment's recovery-time profile is the second critical-path item — nameplate kW alone does not predict real food output during peak service.
Section 5 — The Static Load Allocation Reference Table
This is the table to print out and walk through with your electrician at the site assessment. Numbers are typical for a balanced kitchen line; your actual site will vary based on equipment brands, gas vs electric splits, and refrigeration load profile. We've kept it deliberately conservative — under-spec is the expensive direction.
| Site profile | Cooking equipment | Refrigeration | Warewash | Total minimum amp profile |
|---|---|---|---|---|
| Espresso bar (no hot food) | 2-group machine (15A), grinder, sandwich press | Underbench display fridge | 10A glasswasher | Single-phase, 40A main, 2× 15A dedicated |
| 10–20 seat cafe (light breakfast) | 2-group machine, 4-tray combi (single-phase), induction hob | 2× upright fridges, 1× freezer | 15A underbench | Single-phase, 63A main, dedicated 15A circuits per heavy appliance |
| 40+ seat brunch venue | 3-group machine, 6-tray combi (3-phase), 4-burner induction | 2-door upright, undercounter prep fridges, separate freezer | 3-phase passthrough | 3-phase, 32A per phase, expandable to 40A |
| QSR / takeaway | Twin 18L fryer (3-phase), salamander, char grill, holding cabinets | Ducted bank of 3× upright fridges, 1× large freezer | 3-phase undercounter or passthrough | 3-phase, 40A per phase |
| Full a la carte restaurant | 6-burner gas + electric oven, salamander, 10-tray combi, char grill | Walk-in cold room (separate compressor circuit), bar fridges | 3-phase passthrough + glasswasher | 3-phase, 63A per phase, cold room on dedicated circuit |
| Production bakery | 4-deck oven, planetary mixer, dough sheeter, retarder-proover | Walk-in cold room, blast freezer | 3-phase passthrough | 3-phase, 80A per phase minimum, often 100A |
| Cloud / dark kitchen (multi-brand) | 2× combi ovens, multiple induction stations, holding cabinets | Walk-in cold room, multiple uprights | 3-phase passthrough or conveyor | 3-phase, 80A+ per phase, redundancy on critical circuits |
Two notes on reading the table. First, the "total minimum amp profile" is your tenancy main switch rating — it is what the switchboard can deliver to the kitchen, not what any single appliance draws. Second, refrigeration is often underestimated because its draw is intermittent rather than continuous; a single 2-door upright fridge can pull 12A during compressor startup even though its nameplate is 4A continuous. Cold rooms, in particular, deserve their own dedicated circuit because their startup transients will trip a shared circuit's breaker.
Section 6 — Seven Mistakes That Quietly Cost Operators Real Money
We've watched these seven mistakes recur across hundreds of fit-outs. None of them feel expensive in the moment. All of them are.
Mistake 1 — Trusting the equipment salesperson's "yes it fits"
The salesperson at a generic equipment showroom does not know your site. They cannot know it from a description over the phone. When they say a piece of equipment "fits" your site, they usually mean it fits dimensionally, not electrically. The electrical fit is a separate question that requires reading your switchboard and reading the appliance spec sheet, and it is rarely done by anyone but a licensed electrician. The honest answer to "will this combi work in my site?" is always "send me a photograph of your main switchboard and the appliance spec sheet and I'll tell you."
Mistake 2 — Using a 10A-to-15A converter or extension lead
This is illegal under AS/NZS 3000:2018. It is also a fire hazard, and it voids commercial building insurance the moment a claim assessor sees it on a site photo. Every insurance loss adjuster knows to look for the converter as the first thing on the wall. If you have one in a commercial kitchen, your insurance is paper.
Mistake 3 — Ordering equipment before the electrician has signed off the site
The supplier's lead time is rarely the bottleneck. The network operator is. If you order a 3-phase combi before your network operator has confirmed they can supply 3-phase to your meter, the combi will arrive and sit on pallets. The lease and rent run regardless. We always recommend the order goes in after the electrician's report comes back green, even if it means a two-week delay at the front end.
Mistake 4 — Assuming "commercial property" equals "3-phase ready"
It does not. Many strip retail and arcade tenancies are single-phase only at the sub-board level even when the building has 3-phase at the meter. The reverse is also true — some standalone older shop fits have 3-phase wiring that was disconnected decades ago and can be reactivated cheaply. The only way to know is to check.
Mistake 5 — Skipping the load schedule
A load schedule is a one-page document your electrician produces that adds up every continuous and intermittent load in the kitchen and compares the total against your main switch rating. It takes about an hour to produce. Most operators don't ask for one because it sounds like paperwork. The load schedule is what catches the case where each appliance individually fits the sub-board but the sum of them exceeds the main. The schedule lives in your compliance folder and becomes the single most useful document if you ever sell the business or extend the kitchen.
Mistake 6 — Forgetting that refrigeration runs 24/7
Cooking equipment is on for the trading day. Refrigeration is on always. When operators size their site for "the kitchen during service," they often forget that the cold rooms, undercounter fridges, and ice machines continue drawing power overnight, on weekends, and during shutdowns. A walk-in cold room with a 4 kW compressor running a typical 40% duty cycle averages around 1.6 kW continuous, or 14,000 kWh per year. At commercial tariffs that is real money on the electricity bill, but more importantly it is a continuous baseload on your switchboard that must be accounted for before any cooking load is added. The site needs to handle peak cooking load plus baseline refrigeration, not peak cooking load on its own.
Mistake 7 — Saving money on cable size during fit-out
The electrical contractor's quote will offer options on cable size and conduit. Choosing the minimum-rated cable to save $500 to $1,500 at fit-out is one of the more expensive false economies in commercial fit-outs. Voltage drop across an undersized cable is invisible at installation but becomes a problem the first time you add equipment. We've seen kitchens where adding a second combi 18 months after opening required ripping out floor cable and re-running heavier copper — a $4,000 to $8,000 retrofit that an extra $1,500 in cable at fit-out would have avoided entirely. Always ask your electrician to size cable runs with a 25% future-proofing allowance for the kitchen sub-board.
Section 7 — Frequently Asked Questions
Can I run a commercial combi oven on a 15A plug?
Most commercial combi ovens above 6 trays require 3-phase 415V, not 15A single-phase. Small 4-tray and 6-tray models exist with 15A single-phase configurations, typically in the 5 to 7 kW range. Anything 10-tray and above is almost always 3-phase. Check the combi's nameplate or spec sheet for the supply requirement before any electrical work begins — the same model name from the same manufacturer can be ordered in different supply configurations and the wrong one cannot be reconfigured on site.
What happens if I use a 10A-to-15A converter to plug in a 15A appliance?
The appliance will attempt to draw 15 amps through wiring rated for 10 amps. The wire heats, the GPO and surrounding wall cavity heat, and you have a serious fire risk. The setup is illegal under AS/NZS 3000:2018 and any insurance assessor inspecting the site after a fire will flag it as the primary cause. Commercial building insurance will be voided on this single point. There is no legitimate use case for the converter in a commercial kitchen.
Why does my commercial dishwasher take so long between cycles?
Most commonly, the machine is in a "thermal hold" — its heating element cannot bring rinse water back up to the 82°C sanitisation threshold required by FSANZ Food Standards Code 3.2.2 while the wash pump is also running. On a 10-amp single-phase circuit, the machine has roughly 2,200 watts to work with, which is not enough to do both jobs simultaneously. Upgrading to a 15-amp or 3-phase machine with parallel element firing eliminates the hold and brings cycle times down to 60 to 90 seconds.
How do I tell if my site has single-phase or 3-phase power?
Open your meter box and look at the meter. A single-phase meter has one current transformer (CT) input; a 3-phase meter has three. Alternatively, count the active wires arriving at your main switch — single-phase has one active plus one neutral, 3-phase has three actives plus one neutral. If you are not comfortable identifying these visually, take a clear photograph of the main switchboard and send it to your electrician. Do not remove any covers yourself.
How much does it cost to upgrade from single-phase to 3-phase in Australia?
The cost ranges from approximately $4,000 to $25,000 depending on your network operator, the distance from the street pit to your meter, and whether the local distribution transformer has spare capacity. The bulk of the cost is the network operator infrastructure quote (cable from pit, new metering) plus an accredited service provider installing the new switchboard. Lead times typically run 4 to 12 weeks. Always get the network operator quote in writing before you commit to equipment that requires 3-phase.
Do I need 3-phase if I'm only running a cafe?
Not necessarily. A small espresso-led cafe with a 2-group machine, a 4-tray single-phase combi, and an underbench dishwasher can run on a well-sized single-phase supply (typically 63A main with multiple 15A dedicated circuits). The decision tips towards 3-phase once you add a larger combi (6-tray and above), a pass-through dishwasher, or a heavy refrigeration load such as a walk-in cold room. The static load table in Section 5 sets out the thresholds. If your menu plans to grow over the lease term, sizing for 3-phase at fit-out is significantly cheaper than retrofitting it 18 months in.
The Verdict: Verify the Site Before You Verify the Equipment
Every expensive lesson in commercial kitchen fit-outs in Australia traces back to one root cause: the equipment was specified before the site was understood. The order of operations that prevents the $16,500 timeline is mechanical: switchboard audit first, equipment list second, lease signature last. Reverse that order at your own cost.
If you are at the lease-evaluation stage and want a sanity check on whether the equipment you have in mind will physically fit the site's electrical envelope, the team at KW can review your switchboard photographs and an outline of your intended cooking suite and tell you within one business day whether you are looking at a clean fit-out or a network operator queue. Send through a switchboard photo and your equipment shortlist; we'll come back with a site-aware commercial kitchen package shortlist calibrated to the amp profile you actually have, not the one the equipment salesperson hopes you have.
Two-business-day dispatch on stocked 15-amp and 3-phase commercial machines applies once your electrical envelope is confirmed and the order is placed. The two business days you save at the back end are not the ones that matter. The six weeks you save at the front end, by not ordering equipment your site cannot energise, are.
This guide reflects general principles for Australian commercial kitchen fit-outs and references AS/NZS 3000:2018 Wiring Rules and FSANZ Food Standards Code 3.2.2. It is not a substitute for a licensed electrician's site-specific assessment, which is always required before any switchboard or appliance work. KW Engineering Team — 20+ years of Australian commercial kitchen fit-outs.