⚡ Electricity · Kitchen design · A guide before you order equipment
Electrical power for a professional kitchen: how to calculate the load you need and choose a single- or three-phase connection before ordering equipment
The combi oven is ordered, the range is on its way, the premises are refurbished — and then the electrician announces that the site connection is 3×25 A, while the kitchen needs at least 3×63 A. This is one of the most expensive and most common mistakes when opening a restaurant or café. In this article: how to calculate the required power step by step from your equipment list, what the diversity (simultaneity) factor is, when one phase is enough and when you need three, what the markings 1N~, 2N~ and 3N~ mean, how to balance the load across phases, what chefs and electricians say about it, and what to do if there simply isn’t enough electricity.
~0.69 kW
per ampere of the main fuse on a three-phase 400 V connection
65 %
indicative diversity factor for a kitchen with 6 or more items of hot equipment
9.2 kW
maximum on a single-phase 1×40 A connection — less than one 10 GN combi oven
Contents
- Why power is calculated before ordering equipment
- The basics: kW, amperes and phases
- Single phase, three phases and “two phases”
- How much power equipment draws: a yourhoreca.com comparison
- The calculation method in 6 steps
- Example 1: café and bistro
- Example 2: a 60-seat restaurant
- Grid connection and capacity increase — example: Latvia
- Kitchen electrical installation: cables, sockets, protection
- Experience from chefs and electricians
- How to reduce the power you need
- If there isn’t enough electricity: alternative energy sources
- Service, maintenance and spare parts
- Equipment in the yourhoreca.com range
- Frequently asked questions
01Why power is calculated before ordering equipment
A professional kitchen is one of the largest electricity consumers in a building. A single 10 GN combi oven can demand more power than an entire apartment, and a twin-tank fryer more than a detached house in winter. That is why you need to know the available power before choosing equipment, not after delivery.
🔌 Main fuse
⏰ Lead times
💰 Monthly charge
🔧 Equipment versions
02The basics: kW, amperes and phases
Equipment power is stated in kilowatts (kW), while connections and circuit breakers are rated in amperes (A). To compare them you need two simple formulas.
Single phase, 230 V
I ≈ P / 230
Per kW — about 4.35 A. A 3.5 kW induction hob ≈ 15 A.
Three phases, 400 V
I ≈ P / (1.73 × 400)
Per kW — about 1.44 A in each phase. A 14 kW range ≈ 20 A per phase.
For heating elements the power factor is close to 1, so these formulas are accurate enough for kitchen calculations. For motors and compressors the starting current must also be taken into account.
| Main fuse | Maximum power (indicative) | What it is enough for |
|---|---|---|
| 1×25 A | ~5.8 kW | Coffee point, small snack bar without an oven |
| 1×40 A | ~9.2 kW | Mini café with 1–2 medium-sized appliances |
| 3×25 A | ~17 kW | Café: coffee + convection oven + induction |
| 3×32 A | ~22 kW | Bistro with a small hot line |
| 3×40 A | ~28 kW | Small restaurant or pizzeria |
| 3×63 A | ~44 kW | Restaurant with a combi oven and a range |
| 3×100 A | ~69 kW | Restaurant with a combi oven, range and twin-tank fryer; hotel kitchen |
| 3×160 A and more | ~110 kW + | Canteen, production kitchen, central catering facility |
The table shows the power for the entire site. If lighting, ventilation, air conditioning and the dining room are also supplied from the same connection, less is left for the kitchen.
03Single phase, three phases and “two phases”
In European low-voltage grids there are two types of connection: single-phase 230 V and three-phase 400 V. There is no separate “two-phase” connection in the grid, yet the marking “2N~” does appear on equipment rating plates, and it causes a lot of confusion.
| Marking | What it means | Where you see it | What to do |
|---|---|---|---|
| 230 V 1N~ | One phase + neutral | Small appliances: microwaves, countertop induction, small convection ovens, coffee machines | Can be connected at any site; larger ones (>3.5 kW) on a dedicated circuit |
| 400 V 3N~ | Three phases + neutral | Most professional ranges, combi ovens, fryers and dishwashers | Requires a three-phase connection and a dedicated breaker for each appliance |
| 400 V 2N~ | Two phases + neutral | Some Italian ovens, pizza ovens, dishwashers | Connected to a three-phase supply using two phases; phase imbalance must be taken into account |
| 230 V 3~ | Three phases without neutral, 230 V between phases | Special versions for grids such as Norway’s | Do not order for a 400 V grid — not suitable for the standard European 400 V supply |
| 200–240 V 2~ | Connection between two conductors | Some coffee machines and equipment for the US/Asian markets | Check with the supplier exactly how to connect it to 230 V 1N~ |
When one phase is enough
- a coffee point, ice-cream or pastry display;
- total power up to ~7–9 kW;
- all equipment is 230 V 1N~ and there are no more than 3–4 heating appliances;
- no plans to expand the menu.
When you need three phases
- any kitchen with a combi oven, professional range or fryer;
- a hood-type dishwasher;
- total power above ~9 kW;
- you need headroom for future equipment — practically always.
💡 Important: one appliance, two versions
04How much power equipment draws: a yourhoreca.com comparison
Below are real appliances from the yourhoreca.com range with the manufacturer’s rated power and the calculated current. It helps you grasp the scale: a small convection oven and a large combi oven differ sixfold.
| Appliance | Power | Connection | Current | Price excl. VAT |
|---|---|---|---|---|
| Convection oven FM RXL 304 (4×GN 2/3) | 3.1 kW | 1 phase 230 V | 13.5 A | €719 |
| Pizza oven FM STZ 233 (2 pizzas ø35) | 3.0 kW | 1 phase 230 V | 13.0 A | €749 |
| Convotherm easyTouch mini 6.06 (6×GN 2/3) | 5.7 kW | 1 or 3 phases | 8.2 A per phase | €6,348 |
| Hood-type dishwasher OMNIWASH SMART 60 | 6.8 kW | 3 phases 400 V | 9.7 A per phase | €2,699 |
| Inoxtrend VSDA005E (5×GN 1/1) | 7.0 kW | 3 phases 400 V | 10.1 A per phase | €2,279 |
| Inoxtrend VSDA011E (11×GN 1/1) | 13.9 kW | 3 phases 400 V | 20.1 A per phase | €2,969 |
| Electric range LOTUS PCT-98ET (4 hotplates) | 14.0 kW | 3 phases 400 V | 20.2 A per phase | €1,889 |
| Convection oven FM STG 111 M (11×GN 1/1) | 18.5 kW | 3 phases 400 V | 26.7 A per phase | €3,299 |
| Convotherm maxx 10.10 (10+1×GN 1/1) | 20.4 kW | 3 phases 400 V | 29.4 A per phase | €6,970 |
| Fryer LOTUS F2/13T-78ET (13+13 L) | 21.9 kW | 3 phases 400 V | 31.6 A per phase | €2,259 |
Power and connection according to manufacturer data on yourhoreca.com product pages in October 2026. The Convotherm easyTouch mini 6.06 is rated at 3.0/5.7 kW and is also available in a 1N~ 230 V version; the table shows the 400 V version. The Convotherm maxx 10.10 is rated at 17.2–20.4 kW depending on the configuration.
The gas alternative
Small appliances add up too
05The calculation method in 6 steps
- Draw up an equipment list. For each appliance: rated power (kW), voltage and phases (1N~ / 2N~ / 3N~). Take the data from the manufacturer’s rating plate or specification, not from assumptions.
- Add up the connected load. Separately for hot equipment (ovens, ranges, fryers, kettles, dishwashers) and continuous loads (refrigeration, ventilation, lighting).
- Apply a diversity factor to the hot equipment. Not all appliances run at full power at the same time: thermostats switch the heating elements on and off.
- Check the minimum. The calculated load must not be lower than the sum of the two largest appliances.
- Add continuous loads at a factor of 1 plus a 15–25 % reserve. The reserve is needed for future equipment and menu changes.
- Convert to amperes and distribute across phases. Place single-phase appliances on L1, L2 and L3 so that the load is as balanced as possible.
| Number of hot appliances | Diversity factor | Comment |
|---|---|---|
| 1–2 | 100 % | All appliances can run at full power simultaneously |
| 3 | 90 % | Small kitchen |
| 4 | 80 % | |
| 5 | 70 % | |
| 6 or more | 65 % | Restaurant, canteen — but not less than the sum of the two largest appliances |
📊 What the factor depends on in practice
06Example 1: café and bistro
A typical situation: premises in the old town with a single-phase 1×40 A connection. The plan — coffee, sandwiches, pizza and hot dishes from a convection oven.
| Appliance | Power | Current at 230 V |
|---|---|---|
| Convection oven FM RXL 304 | 3.1 kW | 13.5 A |
| Pizza oven FM STZ 233 | 3.0 kW | 13.0 A |
| Countertop induction hob | 3.5 kW | 15.2 A |
| Coffee machine SCHAERER Coffee Club | 2.3 kW | 10.0 A |
| Glasswasher (indicative) | 3.0 kW | 13.0 A |
| 2 refrigerators and a display case | 1.2 kW | 5.2 A |
| Total connected load | 16.1 kW | 70 A |
⚠ Result
| Phase | Appliances | Connected load |
|---|---|---|
| L1 | Convection oven + refrigerators | 4.3 kW |
| L2 | Pizza oven + coffee machine | 5.3 kW |
| L3 | Induction + glasswasher | 6.5 kW |
07Example 2: a 60-seat restaurant
An à la carte restaurant with a combi oven, range, fryer, hood-type dishwasher and coffee machine. The large hot appliances are 400 V 3N~, while the coffee machine, refrigeration and ventilation are distributed across the phases.
| Appliance | Power | Current per phase* |
|---|---|---|
| Convotherm maxx 10.10 | 20.4 kW | 29.4 A |
| Fryer LOTUS F2/13T-78ET | 21.9 kW | 31.6 A |
| Electric range LOTUS PCT-98ET | 14.0 kW | 20.2 A |
| Hood-type dishwasher OMNIWASH SMART 60 | 6.8 kW | 9.7 A |
| Coffee machine SCHAERER Soul (max.) | 5.8 kW | 8.4 A |
| Refrigeration: 3 refrigerators, freezer | 2.5 kW | 3.6 A |
| Kitchen ventilation | 2.0 kW | 2.9 A |
| Total connected load | 73.3 kW | 106 A |
* For single-phase appliances — the equivalent current when they are evenly distributed across three phases.
🧮 Step-by-step calculation
- Hot equipment: 68.8 kW × 70 % (5 appliances) = 48.2 kW.
- Sum of the two largest: 21.9 + 20.4 = 42.3 kW. We take the larger value: 48.2 kW.
- Continuous loads: + 4.5 kW = 52.7 kW.
- 20 % reserve: 63.2 kW ≈ 91 A per phase.
- Recommended supply for the kitchen: 3×100 A (~69 kW). Without a diversity factor, simply adding up the ratings, you would need 3×160 A.
💡 What this example teaches
08Grid connection and capacity increase — example: Latvia
In Latvia, for example, most low-voltage connections are provided by the distribution system operator AS “Sadales tīkls”. A capacity increase is a paid service, and the process starts with an application and a technical solution. In other countries, the local distribution system operator applies its own procedure and prices.
- Find out your existing connection. The main fuse rating and number of phases are stated in your contract and visible in the distribution board. In rented premises — ask the landlord how much capacity is allocated to your unit.
- Prepare a load calculation. An equipment list with ratings, the diversity factor and the reserve — prepared by a certified electrician or electrical designer.
- Apply for a load increase. The grid operator prepares a technical solution and a cost estimate.
- If the grid needs reinforcing, a construction design is required. This is the longest stage: design, approvals and construction works.
- The site’s internal installation. The new distribution board, cables to the kitchen and the connection of each appliance — separate from the grid operator’s works.
💰 What it costs (indicative)
⚠ The most common mistakes before opening
09Kitchen electrical installation: cables, sockets, protection
Even if the connection is sufficient, a kitchen will not operate safely without a correct internal installation. The electrical installation is designed and built according to national building regulations and the HD 60364 / IEC 60364 standard series, and the work is done by a certified electrician.
| Circuit breaker | Typical copper cable* | Typical appliance |
|---|---|---|
| 16 A 1~ / 3~ | 2.5 mm² | Countertop induction 3.5 kW, small convection oven, glasswasher |
| 20–25 A 3~ | 4–6 mm² | 14 kW range, 6–10 GN combi oven |
| 32 A 3~ | 6–10 mm² | 10 GN combi oven, 22 kW twin-tank fryer |
| 40–63 A 3~ | 10–16 mm² | 20 GN combi oven, kettle group, kitchen sub-distribution board |
* Indicative. The electrician calculates the cable cross-section based on length, installation method, temperature and voltage drop. In a hot kitchen, cables often run along walls where temperatures are higher.
Dedicated circuit
Sockets or fixed connection
Residual current protection
Phase balance
Emergency shutdown
Moisture and temperature
10Experience from chefs and electricians
The numbers are one side. The other is what happens in the kitchen on a Friday night. Here are typical situations that chefs and electricians describe again and again.
🍳 What it looks like in practice: the chef
🔧 What it looks like in practice: the electrician
⚠ What it looks like in practice: the opening
Chefs’ tips
- preheat ovens and fryers one after another, not all at once;
- don’t turn everything to maximum — the thermostat is already doing its job;
- after a service visit, check that all heating elements heat up — one faulty element on a phase causes imbalance;
- note down when the breaker trips — it helps the electrician find the cause.
Electricians’ tips
- an equipment list with rating-plate data before the design;
- a 15–25 % reserve and spare ways in the distribution board;
- separate residual current protection for the large appliances;
- load measurement in the first months after opening to see the real peaks.
11How to reduce the power you need
Often the capacity increase can be reduced or even postponed if the kitchen is planned wisely.
| Method | What it achieves | Suitable for |
|---|---|---|
| Energy management (load shedding) system | Automatically and briefly switches off the heating elements of less critical appliances when the supply limit is approached. Many professional appliances have an interface for such control | Restaurants and canteens at the limit of their connection |
| Dishwasher with hot-water feed | The machine doesn’t have to heat cold water, so the heating peak is lower and the cycle faster | Where the building has inexpensive hot water |
| Induction instead of conventional hotplates | Heats only the pan, and faster; less heat in the kitchen and less load on ventilation | Ranges, woks, hot plates |
| Staggered preheating | The morning peak is spread over 30–60 minutes | All kitchens, at no cost |
| Correctly sized equipment | Two 6 GN ovens instead of one 20 GN only run when needed | Variable load, à la carte |
| Off-peak cooking | Baking, boiling and sous-vide overnight or before opening | Canteens, production kitchens |
✔ Remember
12If there isn’t enough electricity: alternative energy sources
In historic town centres, shopping centres or rural areas, a capacity increase is sometimes impossible or too expensive. Then other forms of energy can help.
| Solution | Pros | Cons | When to choose it |
|---|---|---|---|
| Gas Natural gas | High power without electricity; a gas convection oven draws ~0.3 kW from the mains | Requires a gas connection, a design, ventilation and a gas safety system | The building has a gas supply; large hot line |
| Gas Liquefied petroleum gas (LPG) | Possible even without a gas main | Strict requirements for cylinder storage; not permitted in all premises | Country restaurants, seasonal cafés, terraces |
| Wood Wood-fired ovens | Authentic pizza and grill flavour; practically no electricity needed | Chimney, fire safety, fuel storage, experience | Pizzerias, grill restaurants |
| Solar Solar panels + batteries | Reduce daytime consumption and can cover short peaks | Do not increase the supply capacity; investment; low yield in winter | As a complement to energy management |
| Heat Heat pump or boiler plant for hot water | Lower electrical load for dishwashers and kettles | Requires a supply line and storage volume | Canteens, hotels |
| Generator Diesel generator | Mobility, events, backup | Noise, fuel, costs; must be sized with headroom for motor starting | Events, food trucks, emergency backup |
The hybrid solution
Gas also needs electricity
For gas equipment, see the categories gas ranges and gas pizza ovens; for wood-fired ovens — wood-fired pizza ovens.
13Service, maintenance and spare parts
Electric kitchen equipment is most often damaged not by age but by load: heating elements, contactors and connections go through thousands of cycles. Regular maintenance prevents both breakdowns and unnecessary consumption.
YOUR HORECA service and kitchen design
From a power list to a working kitchen
24/7
customer service
+371 25 522 233
Power list
we prepare an equipment list with power ratings, voltage and phases for your electrician and designer
On site
installation, connection, commissioning and on-site repairs
Spare parts
heating elements, switches, thermostats and motors in stock at our warehouse in Riga, Vagonu iela 23
Maintenance contracts help you plan costs and prevent breakdowns during peak hours. About YOUR HORECA service → · Projects and custom solutions →
| When | What to check | Who does it |
|---|---|---|
| Every day | Whether all zones and ovens heat evenly; no burning smell from the distribution board or appliance | Staff |
| Every month | Limescale in dishwashers, kettles and steam ovens; cleanliness of fans | Staff |
| Once a year | Re-tightening terminals, thermal imaging, heating element resistance, contactors, RCD test | Electrician / service |
| After adding new equipment | Checking load and phase balance, breaker suitability | Electrician |
Heating elements
Switches and thermostats
Motors and fans
Water filters
14Equipment in the yourhoreca.com range
You can choose the connection to suit the equipment, and the equipment to suit the connection. A few examples with different power and phase requirements:
FM RXL 304 convection oven
4×GN 2/3, 230 V. For a café with a single-phase connection and a small volume of hot food.
€719.00 excl. VAT
View →Convotherm easyTouch mini 6.06
6×GN 2/3, available in 1N~ 230 V and 3N~ 400 V versions. A combi oven for a small kitchen.
€6,348.00 excl. VAT
View →Convotherm maxx 10.10
10+1×GN 1/1, 3N~ 400 V. The workhorse oven for a restaurant or canteen.
€6,970.00 excl. VAT
View →Inoxtrend VSDA011E
11×GN 1/1 or 60×40, 3N 400 V, combi mode with humidity control.
€2,969.00 excl. VAT
View →Inoxtrend VSDA005G (gas)
5×GN 1/1. From the mains — only 0.3 kW, 230 V 1N. A solution when electricity is short.
€2,899.00 excl. VAT
View →LOTUS range PCT-98ET
4 hotplates of 3.5 kW each, 400 V 3N, 50/60 Hz. The classic electric range for a 900 line.
€1,889.00 excl. VAT
View →LOTUS fryer F2/13T-78ET
13+13 L, 20 kg/h, 400 V 3N. One of the most power-hungry appliances in the kitchen — plan a dedicated circuit.
€2,259.00 excl. VAT
View →OMNIWASH SMART 60
Hood-type dishwasher, 720 plates/h, water feed up to 50 °C — with hot water the heating peak is lower.
€2,699.00 excl. VAT
View →Prices are shown excl. VAT according to yourhoreca.com in October 2026 and are subject to change. See also convection and combi ovens, induction hobs, electric pizza ovens, dishwashers, refrigeration equipment, coffee machines and kitchen equipment for ships.
15Frequently asked questions
Can a professional kitchen run on a single-phase connection?
Only a very small one: a coffee point or snack bar with a few 230 V appliances totalling up to ~7–9 kW. As soon as there is a combi oven, a professional range or a fryer, you need a three-phase connection.
What is a “two-phase” connection?
European grids do not offer such a separate connection — there is 230 V single-phase and 400 V three-phase. The marking 400 V 2N~ on an appliance means it is connected to two phases and the neutral of a three-phase supply. The marking 230 V 3~ is intended for grids in other countries and should not be ordered for a standard 400 V supply.
How much power does a restaurant need?
It depends on the equipment, not on the number of seats. A typical 50–80-seat à la carte restaurant with an electric hot line needs 45–70 kW, or 3×63–100 A. A canteen or production kitchen — often 80–150 kW. A load calculation shows the exact figure.
Is it enough to simply add up the equipment ratings?
The connected load is the starting point, not the result. Next you apply the diversity factor, check the sum of the two largest appliances, and add continuous loads and a reserve. Simply adding up the connected load usually results in a supply that is too large and too expensive.
Why does the breaker trip if the power is sufficient?
The most common causes: unbalanced load across phases, a shared RCD for several appliances, a faulty heating element leaking to the housing, an overheated connection or the wrong breaker type. An electrician identifies the cause with measurements.
Does induction use more power than a conventional range?
The rated power is similar, but induction heats only the pan and heats up faster. As a result, energy consumption is usually lower and there is less heat in the kitchen. The connection is planned on the basis of rated power.
When is it better to choose gas?
When a capacity increase is impossible or very expensive and the building has a gas supply. A gas range, fryer or oven draws only a few hundred watts from the mains. You have to allow for a gas design, ventilation requirements and a safety system.
Does YOUR HORECA help with the power calculation?
Yes. Based on your equipment list, we will prepare a power and phase table for your electrician or designer and recommend equipment that suits your existing connection. Call +371 25 522 233.
Planning a kitchen and not sure there will be enough electricity?
Send us your equipment list or menu concept and your connection details — we will prepare a power table, recommend single- or three-phase equipment and gas alternatives, and take care of delivery, installation, service and spare parts.
This article is for information only and does not replace a calculation by a certified electrician or electrical designer. Power ratings, currents, cable cross-sections, diversity factors and costs are indicative. Connection costs and tariffs may change — check your distribution system operator’s current price list. The experience stories are typical situations from industry practice.