How to calculate the load?
When selecting electrical equipment, it is important to know how to calculate the load on the cable. An electrical network is used to transmit electrical energy in the form of alternating current, from a power source to certain electrical equipment. Electrical energy is characterized by the following parameters: current, voltage, power grid, alternating current frequency, power of the consumer, that is, the electrical device.
At installation of the power supply network all available equipment is connected only in parallel. Any appliance has a certain power consumption, so the total power of the consumer is determined by the sum of the powers of all connected devices. Thus, by calculating the power of the electrical wiring of a certain room, you can choose the appropriate cable.
How to calculate the load on the cable
To ensure uninterrupted operation of the entire wiring of the room, it is necessary to correctly calculate the load on the cable before purchasing the cable.Since there are different types of loads, the calculation is made for all indicators. Cable section is calculated by current, power, load and voltage.
How to calculate the load current
When choosing a cable, it is necessary to take into account the rated load current, which depends on the cable cross-section. It is chosen from the calculation of the rated current in the network at which the cable does not heat up, and the voltage in the network does not fall. The calculation of the electrical loads of the premises network is performed according to the formula: I = P / U, where I is the amperage, P is the power of the electrical network, U is the voltage that is 220 V.
For the installation of electrical wiring, various types of cables are used, representing several insulated conductors, enclosed in a sealed sheath.
The maximum permissible current load on the cable is directly dependent on the temperature of the cable during its operation, at which its mechanical strength and elasticity do not decrease.
It is also important to determine the cable core material, since different metals have different conductive properties. Residential premises typically use copper cable, since its conductive properties far exceed those of a cable made of aluminum.
For indoor power systems, grounding is required, so the cable must be three-core. Also consider the type of installation: hidden or open, as this also affects the choice of cable section.
Once you have decided on the type of cable, you should take care of the safety of the electrical network. Electric circuit breakers are used to protect against overloads in the network.