The Content Of The Article:

In a house, the consumption of electrical appliances is variable. They do not all consume at the same time and at full power at the same time. This is particularly the case for some electric radiators operating by accumulation. Knowing the expansion factor of your electricity consumption is important when you sign up for an electric subscription contract or if you plan to replace your heating system or electrical appliances.

What is the coefficient of electrical expansion used for?

For correctly assess the real electrical power requirements of a home, it is necessary to apply a coefficient. This coefficient, expressed as a percentage, best reflects your Consumption habits electric, based on everyday practices. Thus, the coefficient of expansion in general electricity makes it possible to evaluate the simultaneous utilization rate of electrical equipment. Usually, in a dwelling this coefficient is between 70% and 80% (0.7 to 0.8).

In a practical way, after adding up the power of your electrical appliances, you will apply the expansion coefficient to obtain a representation of your actual power requirements.

The objective of the coefficient of expansion in general electricity:
know the electrical power you need everyday.

The expansion coefficient is therefore very useful for define the power to subscribe when subscribing to your electricity supplier and so choose the necessary and sufficient contract, without additional cost.

How to evaluate the expansion coefficient?

The precise determination of coefficient of expansion of an electrical installation requires to know in detail the modes of use of the various equipments, in particular their foreseeable duration of use. This calculation must be done by a professional electrician.

The coefficient can be illustrated under shape of a diagram indicating the nominal power of each equipment and showing their duration of use. This data is particularly suitable for businesses (catering, hotels...).

For domestic installations, the consumption of electric heating will of course be predominant in all the various equipment. This coefficient can help you make the right decision if you have plans to change the boiler or radiator. You can take advice from a qualified heating specialist to choose a heating solution more efficient and economical.

Finally, it is useful to keep in mind that it is possible to ensure that the most important consumption is organized, controlled and planned over time. This is commonly the case for domestic hot water with "off-peak" programming. But we can go much further with what we call "smart grids". These smart grids rely on emerging technologies for accurate measurement of consumption, for example via Linky meters.


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