Wiring is not a joke. Choose cables for the installation of electrical network in the house need to be careful, given the maximum load. After all, it is enough to be mistaken, as there will be an overheat and the wire itself can be kindled. At best, a short circuit will simply occur and the supply of electricity will simply stop.

So before you buy a cable, you need to select it correctly. The greatest problem is caused by the lead-in cable, on which there is a load of absolutely all household appliances in the house. So it basically can not have a small section. But you should not immediately take the biggest - it does not serve as a guarantor of security, but will lead to unnecessary waste of money.

At the same time, you can not take the cable "back to back". For example, sometimes private traders take and plug a 1.5 mm2 cable into the sockets. And then they wonder why a new device connected to it breaks down or causes a short circuit. In this case, it is much more advantageous to use a wire with a cross section of 2.5 mm2.

But back to the introductory cable. It takes the greatest load, because it feeds all appliances in the house. What is the section to choose and how to calculate it? It is necessary to look at how many electrical appliances are in the house (you need to take into account those that are sometimes included, for example, an electric lawn trimmer or floor fans activated only in the summer), and learn the total power.

Here, the technical passport of the device is useful, so it is worthwhile to look for them. If they are lost, too, do not be afraid - on the Internet you can find the exact information. Or use a general table of approximate power (but it will concern either the most advanced devices, or will take into account the most powerful ones, not taking into account that you can have economical options).

Collecting the total capacity (and also adding to it the power of those devices that you plan to buy in the near future), multiply it by 0.75. The result is an exact figure of the input cable.