What is better for a private house - single-phase or three-phase input?

In a technical phase network, the maximum allowed power can be 10-15 kW, but only for each phase. The benefits are becoming apparent. The disadvantage is the price when connecting.

Yuri, really? Where is this Eldorado, let me ask? 30-45 kW for home ownership! I have never seen such a thing.

“Many people believe that a three-phase network will consume more power, that is, turn on more devices. This is not entirely true. The maximum allowed power is indicated in the technical specifications for the connection. As a rule, for a three-phase network this is 15 kW per household, and for a single-phase network - 10 or the same 15 kW. Obviously, the benefit in power is small, and may be completely absent. "

What do you mean power gains may be missing?

In a three-phase circuit with a symmetrical voltage system and a symmetric load, it is enough to measure the power of one phase and triple the result. (S = 3 SF = 3 UF IF), i.e.the rating of a three-phase circuit breaker in current will be less than the value of a single-phase circuit breaker, but you can connect to it several times (almost three) more receivers than to a single-phase .........

Dmitriy,
Namely, the value of the input automatic machine will be less, so that the power will be exactly 15 kW and no more, there will be no gain in power, how much will be given to you in the power request, no matter what input 220 or 380. And the power will be S = UI (for full power), since the star system is with a grounded neutral (the triangle for which you gave the formula is used at a voltage of 6-10 kV, I only saw it there). That is, the input to 380 V the input machine is somewhere around 25 amperes, if the input to 220 V is then 80 amperes, so Sasha, Santa Clauses do not have sales rights and they will not let you take more than in the application.

I apologize for the formula a little wrong S = U I * root of 3 the root was not copied from AutoCAD

Vladimir,
those. I can not include more single-phase consumers in a three-phase network than in a single-phase network with the same power?

Probably, in terms of current, the load can be increased 1.7 times?

Well, you people? You directly upset me. It seems to be written clearly enough.

What determines the number and total power of receivers in a household network? From the maximum allowed power, which is limited by the value of the input machine. Right?

Well, they made you a three-phase input and a 25-amp automatic input device - you already physically will not take more than 16.5 kW. And in a single-phase network, for example, there was a 63-ampere - 14 kW. And you have come up with a lot of power with three phases?

And for those who believe that the whole thing is only an introductory machine, I inform you that they are now setting individual limiters of power consumption. If you have enough, you’ll disconnect.

So at least three, at least one phase - how many kilowatts will be given to you by the sales company, you will consume as much as you can.

Dmitriy,
you can’t, moreover, with a single-phase circuit, the values ​​of the machines will be more than with a three-phase circuit (see the introductory, since it is necessary to dance from it according to selectivity), therefore a three-phase network is needed only where it is justified by the presence of three-phase consumers, otherwise the candle play is not worth it. Moreover, in a three-phase network there is a greater chance that with a large number of boards (if they are powered by each other, for example, an input-floor-distribution) and a small capacity, problems with selectivity will arise and you will have to banish putting machines with a curve "B" and not standard "C" and count, count, count .

It doesn’t matter to the machine whether it is single-phase or three-phase; if the top of the machine is 25 amperes, then it is lower or 20 or 25 but the curve is “B”.

I believe that when choosing a one- or three-phase network, it is necessary to be guided by the allocated power, which with a single-phase input can be at least 3.5 kW, and with a three-phase input - at least 10 kW. Otherwise, you do not simultaneously turn on the kettle with a heater or distribute the loads very accurately if you use a three-phase network of less than 10 kW

Three-phase input should be connected only if the house has electrical equipment in the form of machines operating on high voltage. In other cases, three-phase input is not needed.

: - yes 127v instead of 220v and we are also on Mars

Yuri is right 10-15 square meters for each phase.

100 allowed me introductory, on the flap 80 I do not bother.

Three phases have an advantage where ZF motors, welding and other energy-intensive consumers of more than 3 kW work and ease of starting the engines, but since the Soviet Union there has been a strict restriction on three-phase consumption, since network companies sell large amounts of electric energy per hill, and new stations are not built or very few

energy sales by any means limit consumption according to the allowed capacity, plus we also live in Russia and the loss of one phase in the network or another .....

3F has one indestructible advantage. LDSs included as ABCABCABC do not flicker in total. And LDS / CFL / RVL is now everywhere.

Hello everyone! I have a question! I must say right away that I do not understand these issues! Just the father-in-law decided that he needed a connection to a three-phase network in the country. We have a simple wooden house, probably about 100 years old! This year, water was brought into the house, a pump is running, the summer kitchen is also connected through an extension cord, next year he wants to put a trailer. At 60 meters from the house is a transformer, out. 3 phases. 62A, from the house to the post 20 meters. Please tell me, do we need a three-phase and will we be allowed to connect? Thank you all for the answer :-))

Anna,
If the father-in-law does not organize a workshop with a lathe (or other powerful equipment), then in the country house 3 phases are not needed.

Hello. Tell us, an electric boiler is connected in our house. a boiler and if you turn on at the same time the voltage drops so that nothing else works even the light bulb is barely lit. and the boiler does not raise the temperature. tell me what to do. we were told a three-phase meter will help or is a stabilizer better? thanks in advance.

olya, Good afternoon. The reason for a significant voltage drop when you turn on a powerful household electrical appliance may be a mismatch in the conductor cross-section of the electrical wiring to the actual load. In this case, when the load flows along the wiring lines much higher than the nominal values ​​for these conductors, it leads not only to a voltage drop, but also to heating of the conductors, which ultimately can lead to damage to the wiring. Another reason is the unsatisfactory condition of the contact connections of the conductors in the electrical distribution panel, in the intermediate distribution boxes, as well as in the place of connecting the input of your house to the power line. In any case, before installing the stabilizer, it is necessary to attract a specialist who will analyze the condition of the wiring and find the optimal solution to this problem.

In apartment buildings, a three-phase meter records the incoming electricity. With an asymmetric load, will the sum of the readings of single-phase meters in the apartments be equal to the readings of a three-phase meter? How does the phase shift affect the correct metering of the electricity supplied to the house by a three-phase meter and the sum of single-phase ones? We are talking about the often unexplained circumstances of increased electricity consumption for general household needs (MOS)

Hello, please tell me who knows, I have 220 at home, I bought a machine for three-phase 9kW suspended ceilings, I need to carry out 380, local electricians don’t give it, they say that I will leave the street without light, what can I do, do I have the right to refuse? Thanks in advance.

Oleg, in this case, you need to contact the energy supply company that connects consumers in your area with a request to connect a three-phase input. Each company has its own rules, its own connection rules. In any case, connecting a three-phase input to the house is quite real. The only caveat is the set limit on the power consumption per house. They will not be denied power supply, but they can simply set a limit on power consumption, which will not allow you to use this machine. Specify what limit of power consumption is determined when connecting a three-phase input. If it is, for example, 9 kW, then this is unacceptable, since you will not turn off electrical appliances throughout the house just to use this machine.

Well, at the expense of what the "local electricians" say - this is complete nonsense.In any case, if the connection is coordinated with the power supply, it means that you can easily use all electrical appliances whose total load does not exceed the power limit set by the power supply. If the inclusion of such a load in the network could lead to damage to the electrical network, then in this case the power supply would refuse to connect a three-phase input with such a power limit.

For example, I was faced with a situation where all consumers in a small village had circuit breakers installed in an electric energy meter with a nominal value of 16 A. Power sales workers refused to install automatic machines with a high nominal value, arguing their failure with the unsatisfactory state of wiring in apartments, private houses. The corresponding directive is in the power supply company, but there were no requirements for the fulfillment of which it was possible to install a circuit breaker with a large rated current. Although for a fee (illegally), energy sales workers agreed to install machines with a higher nominal value - the limit of power consumption increased accordingly. In any case, if you are offered a small limit on power consumption, you can try to agree on increasing the limit to the required values.

Dear users ! Please explain, at the dacha in the suburbs, the voltage constantly jumps, often below 220 volts, the closest neighbor has a three-phase current (380 volts) does it make sense to try to connect from its branch, especially since the action is now taking place. I apologize if the terms are not professional. Answer please.

It is impossible to get three phases into a house "just like that". Permission and terms of reference from an energy sales company are required.

Tell me please. We have a 380 V counter, and a 220 V stabilizer. Is it possible to install a stabilizer or is it needed at 380 V?

Alexander, the common-house meter also considers network losses to individual metering devices. For example, you can simultaneously measure the voltage on both counters

Alexei, you need to measure not voltage but current!

And there are also “smart” housemates who steal electricity, and the rest of the residents are stolen included in payment as ONE.

,, But in your network, after the metering device, you need to distribute the load as evenly as possible. This places an additional responsibility on the electrician performing the installation. ,, - we will take into account.

In my village, before I requested 3 phases, the voltage above 180 never rises, and dropping at the input of 60V is also a nice thing. Two cascade-connected stabilizers were cut down low, and the second, smart.

Wrote a statement on the power grid. Went a little to accept. But in Moscow the horns are longer and thicker than in Yegoryevsk. Accepted. Six months have passed. Changed the posts, dragged copper into 3 phases. We have connected one so far. Without a load of 275V, under a load below 218 it did not fall.

I’m thinking, drag me 3 phases to the house or will it work?

Stabilizer for 42t.r. it’s kind of not needed ...

Maybe we will make them work, instead of trying to eliminate their mistakes for our money?

And it took only one statement and then 3 letters.

1st Director of Dep. Eastern e-mail networks - a copy to the Minister of Energy of the MO, a copy of the Consumer Rights Protection Society.

2nd Minister of Defense, copy to the Minister of the Russian Federation, copy of GDP

3rd, you guessed it, already without MO.

Hello.
Baseline conditions.
Venue - Kaliningrad, a private house.
Entering the house - 3 phases.Aluminum wire ~ 6mm diameter (!) (I can say more precisely later when I measure it)
Task.
Connect a 3 phase oven (to the sauna),
connect the whole house.
1) Basement = garage + (possibly) workshop + garden + water supply
2) Ground floor = kitchen (many consumers) + common premises
3) Second floor + attic = living rooms.

avoid phase imbalance and so on and so on.
I guess
put on a shield on each floor (2nd and common attic)
on each shield, separate 380v + separately the cable to the furnace.
and from each shield scatter in phases in groups.

question
A) is it right or wrong. if not, then how to.
B) how to distribute devices in phases. look for simultaneity coefficients or "by eye".
C) what additional devices (in addition to RCD \ DiffAvt.) Recommend installing.

And yes. How to calculate what section should be a grounding conductor. (I think that what is brought in there is too small a section)

Thanks in advance

In most cases, there are no three-phase consumers in the house! These are electric motors, electric heaters of high power ... well, in everyday life, perhaps that's all ....
But the dangers when using a 3-phase circuit are greater:
- between phases 380V, which means that if you accidentally touch the two phases, the consequences for the body will be more serious;
- with a uniform distribution of the loads in phases, the voltage of different phases will appear in different sockets, and in some cases these phases can "meet" ... the result is a good K.Z .;
Therefore, in the general case, it is better to use a 1-phase network in the house ... there is no need for an even distribution of loads, and there is less chance of emergencies in which you, as an expert, cannot figure it out on your own.
Of course, if the house has three-phase loads, then it seems without an alternative ...
Although there are options here:
The load of the common house network is large and you use a 3-phase network, there are balancing transformers that convert three phases into one, the advantages are obvious: a uniform load on all three phases in any case, minimal voltage fluctuation in the secondary 1-phase network, well, and others troubles about which I wrote above.
On the contrary, you use a 1-phase network and bought a three-phase consumer, then you can purchase a converter of the 1st phase to 3-phase, and of course you must understand that the maximum permissible currents in the primary network should not exceed the established norms.
Both options cost money, of course. You decide.
Successes.

I have a counter 3-phase self-propelled guns 5-100A 2005. They gave an order to replace the electronic meter. I bought an electric meter Neva 303 1SO 5-100A. The operating organization says that you need to put 5-50A. Can I put a 5-100A counter?

Hello
I have a resolution of 380 by 15 square meters of power limiter. Is it possible to connect a 3-phase sawmill for 22 square meters.

Hello! In a private house I want to install 4 electroconvectors of 1.5 kW each. Energosbyt stutters about three-phase input. But you can not put a single-phase input with a separate counter? It seems that the load is not big.

Author, Why in a summer house cooperative a single-phase network is connected without any problems, and a three-phase network requires a project. Is it legal and where is it defined, by what document? Thanks in advance.

When buying a house, the former owner was “noisy” - I have a three-phase meter, I have a three-phase meter at almost every meeting.

When a counter was installed, lighting disappeared in one of the household buildings. There were two electricians from Energosbyt (about those I say - '' C is so good G ... but to eat for distillation ''). The other day I got to look for a reason. In the work, only two phase wires turned out to be connected, the third was resting - I chewed the nozzles, I connected the garden building from it.This is me if someone decided to supply a three-phase power supply - CHECK, DO NOT TRUST - ELECTRICIANS WILL USE THE CUSTOMER'S UNKNOWLEDGE OF THE SITUATION. And THEY DID NOT CHILATELY CUT DOWN AND OFFICIALLY IN THE OFFICE, AND MYSELF ADDITIONALLY ON THE PLACE.

How to connect three Sven LCD 10000 single-phase stabilizers in a three-phase network to connect a three-phase motor (3 kW)?

Platon2, just connect a stabilizer in each phase, adjust the three stabilizers to the same output voltage. But in this case, the disadvantage is that if one of the stabilizers fails, there will be an out-of-phase mode, which is unacceptable for the engine. Therefore, it is necessary to provide protection - install a phase monitoring relay, which will completely de-energize the motor in case of absence of voltage in one of the phases.

Perhaps in this case it would be better to choose a three-phase voltage stabilizer if, in addition to the electric motor, it is not planned to connect a single-phase load to the voltage regulator.

Also in this case, it is necessary to take into account that the starting of the engine is accompanied by large starting currents, which quickly damage the voltage regulator. In this case, it is necessary to ensure a smooth start of the motor or to compensate for starting currents.

If the voltage in the network is excessively low, then this will also lead to the rapid failure of a conventional voltage regulator. Therefore, it is better to use special voltage stabilizers for long voltage drops or a household step-up autotransformer.

Dear power engineers !!! Please enlighten .... we have a 2-story guest house with 20 rooms in 6 rooms, split systems and refrigerators, and TV is in 20 rooms, in addition there are 6 more large refrigerators in different parts of the house ..... there was a single-phase line, a powerful automatic machine was installed on 5 kW (under an agreement), it seemed to be normal in the summer and then the meter started to melt .... we decided to put a 3 phase line on 15 kW. Do you think I will have enough energy if I plan to put splits and refrigerators in the remaining 14 rooms in the future ????????? or a waste of money for 15 kW ???????

If you decide to make a three-phase input, then in order to create an electronic project, you need to get permission in Energy Supervision. In addition, you will be required to establish a power shield at your expense, with the control panel and meter installed in it. The project of electricians, will not be done without the installation of high-quality grounding. After completing all these points, a specialist from energy supervision will come and draw up an act on the basis of which you can make a project.

It seems to me that if the summer cottage is small, suppose one room and a kitchen, then single-phase input is suitable instead of three-phase input, and the project is for a fee, but it is not small, any company that deals with these services will do it for you, they won’t even go to the place , and they will do everything according to your words, but when you do the installation, yourself or an electrician, you have to stick to the project otherwise the Energy Supervision will not accept.

The situation is this, there is one phase 16A old machine. Garden society of 40 houses, 160kVA, voltage jumps, up to 270V in one phase is real. Often 240 or 250. On a transformer for measuring voltages / amperes in phases: L1 243V / 11A L2 240V / 34.5A L3 253V / 0.5A Often, electrical appliances burned out in people with s / o. I think to put a meter + three-phase power supply, because tension jumps and phase imbalance on the face. Correctly spreading the load in the house will be less of a problem for the chairman. The house is low-power, but there are heating appliances: a 800W thermal pot, an oven 1-1.5kW + a refrigerator 300-800W (?). If you evenly scatter, for example, L1 kitchen (light and thermal sweat); L2 bedroom (light and refrigerator); L3 bath (light and oven).Fine? There are no more consumers, the oven does not work often, 380v there are no consumers yet, BUT because of this voltage, three-phase supply is vital for life. In addition, energy companies are more profitable, with a uniform distribution of the load in the house there will be no problems.