How to calculate the cross-section of the wire harness

How to calculate the wire in the cross section for the opening of the power cable

In order to calculate this figure must be deducted the total capacity of all the appliances (kettle, washing machine, iron, ovens, heaters, lighting fixtures), which can be usedfurther.Electrical power can be found by examining the labels, passports, box and the products themselves.The resulting figure is multiplied by a factor of 1.5, or 2, to create a reserve.

For the convenience of the room in which the wiring is calculated can be divided into zones and calculate wire size on the basis of this division, for example, a separate house, a garage.This must be done as accurately as possible, because of the operation of this indicator the efficiency of the machine shutdown will depend.If the calculation is wrong to hold, then the machine will not operate either in an emergency or to be switched off unnecessarily if multiple high-power electrical appliances will be included in the network.

calculation section of wires should be done with the stock and automatic circuit breakers must be selected as closely as possible, so that it is the most effective in case of emergency.

How to calculate the cable cross-section for

load After the index is calculated the total power necessary to determine the type of cable.For these purposes may be used copper and aluminum cable types.But nowadays mainly use copper because aluminum more brittle and require a larger cross section.Therefore, their use is not advisable.

For example, take the total capacity of all the appliances 10-15 kW.If you use copper cable, it will take 6 square cross section for such a load.mm.And for aluminum - 10 square meters.mm.At a load twice the cable cross-section is increased three times.These calculations are applicable to single-phase open pads.But if it is closed, to prevent overheating and fire, you need to have the calculated index to do more in the half.

How to calculate the wiring inside the house

for cabling within the home using such sectional indicators:

1. for sockets using a cable with a cross section of 2.6 square.mm.
2. for lighting devices - a cable with a minimum cross section of 1.5 square.mm.

Particular attention should be paid to the kitchen, since that is where powerful devices are used in a large number (washing machines, electric stoves and ovens, the system of floor heating).This factor should be taken into account and possibly make a separate wiring for the most powerful appliances.Thus it is necessary to take into account such indicators:

1. to load a 3-kilowatt minimum cable cross-section - 1.5 square meters.mm;
2. to load 4.5 - 2.5 square meters.mm;
3. Under load 6 kW - 4 sq.mm;
4. If the load is equal to 8 kW, the required cable cross-section - 6 square.mm.

Conclusions

Determine the required cable cross-section can be independently, a calculator and not making complex calculations, drawing attention to the table of Operation Rules of electrical installations.But if you have neither the desire nor the ability to do it yourself, you can use the online calculator to calculate the required wire size, or hire the services of professionals.