All life of modern society is constructed on almost continuous electricity consumption. The industry and agriculture, transport and personal housing constantly need electricity. In order that energy arrived smoothly and without accident, it is necessary to calculate the section of wires of an electrical wiring correctly.
It is required to you
- Calculator, construction roulette, table of calculation of section of a wire
Instruction
1. Calculate the total length of an electrical wiring. It can be done in two ways: having measured distances between guards, sockets, switches on the wiring diagram and having increased result by scheme scale, or having taken measurements directly on the place where the electrical wiring will be laid. As wires will connect among themselves, make adjustment for connection and extend each piece not less than on 100 mm.
2. Calculate the general loading of the consumed electric power. For this purpose summarize rated power of all electric devices which are in operation now, and think what else devices, perhaps, will be used in the future. Calculation needs to be carried out with a margin of safety and reliability. Increase the received sum by the simultaneity coefficient equal 0.7.
3. For accident prevention on the electric line on introduction the cable needs to be put the automatic switch. In premises the single-phase current is used by voltage of 220 V. Share the counted general burden at tension size (220 V) and receive current which will pass through introduction the automatic machine. If on sale there is no automatic machine with such face value, buy with close parameters, but with a stock on current loading.
4. Section of a wire pays off in two parameters: to permissible long current load and loss of tension. Loss of tension happens in the wires connecting a source of current and the consumer. If you count an electrical wiring for the certain room and devices of small power, can not consider this indicator as losses of tension will be negligible.
5. The cable has to be three-vein as one conductor is used for grounding. It is better to choose a copper wire as electric indicators of copper it is better, than aluminum. Be defined what type of wiring you will use – closed or opened. Now, when you know settlement current, cables and option of conducting chose type, find the necessary section of a wire in the table.