Planning of the electric network in the kitchen is a fundamental stage of repair, on which not only the convenience of using household appliances, but also the safety of residents depends. Modern kitchen is an energy-intensive space where you can work at the same time oven, cooker, dishwasher, refrigerator and many small gadgets. Errors in the design phase often lead to knocking out of traffic jams or overheating of the wiring, which in conditions of high humidity and temperature changes becomes a critical risk factor.
Literate electric requires careful calculation of loads and the selection of appropriate materials. You can not just “throw” wires on the walls, hoping for a chance; each cable must have a margin of safety and correspond to the nominal value of protective automation. Unlike other rooms, there are stricter zoning and moisture protection rules.
Before you take a throborizer in your hands, you need to clearly represent the location of the furniture headset and embedded equipment. The transfer of the socket after laying the tiles or mounting the kitchen is often impossible without violating the aesthetics of the interior. Therefore, a detailed plan is not a bureaucracy, but a necessity to avoid costly alterations in the future.
Power calculation and selection of cable cross-section
The first step is to determine the total power of all electrical appliances that are planned to be used. The kitchen is a place of concentration of powerful consumers: an electric stove or cooker can consume from 7 to 10 kW, an oven - about 3-4 kW, and a flow water heater - up to 8 kW. If you add up these values, it becomes obvious that standard wiring in older homes may not be enough.
To choose the correct cross-section of the vein, it is necessary to rely on the material of the conductor. In modern conditions copper-cable It is a standard without alternative due to its conductivity and flexibility. Aluminum wires, which are often found in Soviet buildings, are now prohibited from use, since they are prone to oxidation and brittleness, which can lead to fire in the joints.
It is important to divide the food chain into groups. You can not power all the outlets of the kitchen with one machine, especially if there is supposed to use powerful equipment. For cooking panels and ovens, a separate line with a cross section of 6 mm2 is usually laid, and for a rosette group, where kettles and microwaves will be included, 2.5 mm2 is enough.
Use the PUE table (Power Plant Devices Rules) to accurately determine the permissible current for the selected cable cross section at a specific ambient temperature.
| Type of consumer | Approximate power (kW) | Recommended section (mm2) | Score of the machine (A) |
|---|---|---|---|
| Cooking panel | 7.0 – 10.0 | 6.0 (Cu) | 32 – 40 |
| Window cabinet | 2.5 – 4.0 | 2.5 – 4.0 (Cu) | 16 – 25 |
| Rosetta Group | up to 3.5 (total) | 2.5 (Cu) | 16 |
| Lighting | 1.5 | 1.5 (Cu) | 10 |
Schematics and zoning of the kitchen
The scheme of electrical wiring is created on the basis of the design project of the kitchen. You should know exactly the height of the countertop, the location of the hood, refrigerator and wash. Electric points are divided into three main zones: the lower (for embedded equipment), the middle (for small appliances on the table) and the upper (for hooding and illumination).
The lower tier of sockets is usually hidden behind the basement of the kitchen set or placed in the adjacent closet so that they do not interfere with the installation of equipment. The height of the installation for the middle zone, where blenders and toasters are included, is standard 105-115 cm from the floor, that is, 10-15 cm above the level of the countertop. This allows you to use the devices comfortably without bending over.
Particular attention should be paid moisture-proof. Outlets located near the sink should have a moisture protection class not lower than IP44, but preferably IP54. Such products are equipped with rubber curtains and seals that prevent water spray from entering the live parts.
⚠️ Attention: It is strictly forbidden to place sockets directly above or under the sink, as well as behind the dishwasher in the zone of direct water intake. The minimum distance from the water source to the electrical point shall be 60 cm.
Rules for laying and strobbling
Installation of wiring is carried out in a hidden way, that is, cables are laid in the stroves (channels in the wall) and closed with plaster. This requires the use of a professional tool - a stroboresis with a vacuum cleaner, which allows you to make smooth channels and minimize the amount of dust. In brick and concrete walls, it is forbidden to make horizontal stroves longer than 50 cm, so as not to disturb the bearing capacity of the structure.
The cable must be laid strictly vertically or horizontally. Diagonal gasket, although saving material, is unacceptable, as when drilling walls for shelves or paintings, you can accidentally damage the hidden wire. The distance from the corner of the wall to the vertical route should be at least 10 cm, and from the ceiling - at least 15 cm.
To protect against mechanical damage, it is recommended to lay the cable in a corrugated pipe, especially if the walls are made of combustible materials or a stretch ceiling is planned. However, in monolithic concrete or brick under a layer of plaster thickness of more than 1 cm, cable laying is allowed. VWGng-LS without corrugation, if permitted by local regulations.
☑️ Tracking plan
When crossing the tracks, it is necessary to observe the distances to other engineering communications. Distance to gas pipes should be at least 40 cm, and to water supply and heating pipes - at least 10 cm. If crossing is not possible, the cable at the point of contact is protected by additional insulation.
Installation of switchboard and automation
The control center of the kitchen electrics is a switchboard. For the kitchen, as a room with increased danger, installation is mandatory CCD (devices of protective shutdown) or differential automatic. These devices respond to a current leak and instantly turn off power, saving a person from electric shock in the event of a break insulation.
Each powerful line (window, cooker, dishwasher) should have its own automatic switch. This will allow you to de-energize a particular repair device without turning off the lights and refrigerator in the entire apartment. The nominal value of the machine is selected strictly by the cross section of the cable, and not by the power of the device, to protect the wiring itself from overheating.
Example of automatic marking: C16where "C" is the response characteristic (for active load),
a"16" is the nominal current in Amperes.
All wire connections must be performed in distribution boxes or directly in rosettes. Screws, even the highest quality, are prohibited in modern electricians. To connect copper veins, use Wago terminals or pressing with sleeves. This ensures a reliable contact that will not weaken over time and will not start sparkling.
⚠️ Attention: Never combine the zero wires of different groups into one terminal if they are protected by different RCDs. This will result in a permanent activation of the protection when any of the groups are included.
Installation of sockets and switches
The final stage is the installation of fittings. For the kitchen, it is optimal to use sockets with ground contact, even if the house has an old double-wire riser (in this case, the grounding is organized separately or put by an ultrasound). The socket mechanisms should be of high quality, with brass or bronze contacts that provide better conductivity than sprayed steel.
Switches for illumination of the working area and main light are better to take out of the kitchen apron, in the corridor or in the entrance to the kitchen. If the switch is in the kitchen, make sure it is located at least 50 cm away from the sink and gas pipe. To control the lighting over the countertop, pass switches or motion sensors are often used.
Secrets of mounting rosettes
When installing rosettes in drywall, use special models with clamped legs. In the concrete walls, the rosette sits on the alabaster, but before that, be sure to remove the dust from the hole and moisten it so that the plaster does not give all the water to the wall instantly. This will provide a monolithic clutch.
After installing all the mechanisms, it is necessary to check their operation. Turn on the machines and check for voltage with the tester. Make sure phase and zero are not confused, although for simple outlets this is not critical, for some types of equipment (e.g. gas boilers with electronics), proper phase connection may be important.
Common Mistakes and How to Avoid Them
One of the most common mistakes is saving on materials. Buying cheap cable with an under-section of the vein or sockets, not designed for 16A current, leads to heating and melting of the insulation. Remember that heating the socket to 60-70 degrees Celsius is a sign of malfunction or overloadAnd you can’t exploit that point.
Also, they often forget about the supply of cable. When installing, leave tails 10-15 cm long in rosettes, and in places of possible installation of switchboards - up to 30 cm. This will allow in the future to replace the burnt out outlet or switch the circuit without building wires, which is undesirable in hidden wiring.
- 🔌 The use of aluminum wires for new wiring is a direct violation of fire safety standards.
- 🔌 The lack of color markings of the veins (phase-red/brown, zero-blue, earth-yellow-green) complicates future repairs.
- 🔌 Structure of walls at an angle or diagonally, which creates risks of damage to the cable during drilling.
- 🔌 Installation of sockets behind the built-in equipment, which has a depth of more than standard (60 cm), because of which the plug simply does not fit into the niche.
The main principle of high-quality electrical exploration is power reserve and availability of service. All connections must be reliable, and the scheme is understandable even after 10 years.
Another important detail is the documentation. After the work is completed, take photos of the walls with the marking of the tracks to the plaster or make an accurate plan with references to the corners and floor. This will save you from getting a drill into the wire when installing a kitchen set or cornices.
Can I use one socket for the oven and cooking panel?
Technically, this is only possible through a special double socket designed for total current, but in practice it is highly recommended. The cooker and the oven are powerful consumers, and their simultaneous operation at maximum power through a single point can lead to overheating of contacts and fire. It's better to divide these lines.
Do I need a grounding if it is not in the house?
In old-built houses (twin-wire TN-C system), there may be no grounding in the shield. In this case, it is strictly forbidden to make “grounding” on the battery or water pipe. The only correct solution is to install an ultrasound with a leakage current of 30 mA, which will protect life even in the absence of a grounding conductor.
What height to choose for the socket hood?
The optimal height for the hood outlet is 180-200 cm from the floor, or level with the upper edge of the upper cabinets, but with a shift to the side so that the hood does not block access to it. The exact location depends on the hood model and duct design.
What to do if the cable is short?
Building cables in the wall without a junction box is prohibited. If you find that the cable is short, you will either have to knock down the plaster at the connection point and put the box, or pull a new line. The twists under the plaster are a time bomb.