Technologies, Electronics
Wire cross-section for wiring
Electricity has become so firmly entrenched in our lives that with the sudden disconnection of electrical power our lives seem to freeze, and we look forward to it being restored. We are surrounded by a huge number of different electrical appliances that connect to the home network either directly through the sockets, or through
Sometimes it is necessary to light the garage or other economic building, replace the wire or make a self-made extension cord. Or you need to find out which maximum number of devices can be simultaneously included in one tee so that it does not heat the wire and cause a fire due to a short circuit. In such cases, the wire section must be calculated in advance to ensure the safety of the installed wiring.
Which wire should I choose?
It's no secret that copper has less resistance compared to aluminum, and therefore if you compare copper and aluminum wires with the same wire cross-section, then in the first case the permissible load will be somewhat larger. The copper wire is stronger, softer and does not break at the points of inflection. In addition, copper is less prone to oxidation and corrosion. The only advantage of an aluminum wire is its cost, which is three times or four times less than the copper one.
Calculation of the wire cross-section by power
Wire cross-section, sq. Mm | Copper wire (cable, core) | |||
Voltage in the circuit, 220 V | Voltage in the circuit, 380 V | |||
power, kWt | Current strength, A | power, kWt | Current strength, A | |
1.5 | 4.1 | 19 | 10.5 | 16 |
2.5 | 5.9 | 27th | 16.5 | 25 |
4 | 8.3 | 38 | 19.8 | thirty |
6th | 10.1 | 46 | 26.4 | 40 |
10 | 15.4 | 70 | 33.0 | 50 |
16 | 18.7 | 85 | 49.5 | 75 |
25 | 25.3 | 115 | 59.4 | 90 |
35 | 29.7 | 135 | 75.9 | 115 |
50 | 38.5 | 175 | 95.7 | 145 |
70 | 47.3 | 215 | 118.8 | 180 |
95 | 57.2 | 260 | 145.2 | 220 |
120 | 66.0 | 300 | 171.6 | 260 |
Wire cross-section, sq. Mm | Aluminum wire (cable, core) | |||
Voltage in the circuit, 220 V | Voltage in the circuit, 380 V | |||
power. KW | Current strength. A | power. KW | Current strength. A | |
2.5 | 4.4 | 20 | 12.5 | 19 |
4 | 6.1. | 28 | 15.1 | 23 |
6th | 7.9 | 36 | 19.8 | thirty |
10 | 11.0 | 50 | 25.7 | 39 |
16 | 13.2 | 60 | 36.3 | 55 |
25 | 18.7 | 85 | 46.2 | 70 |
35 | 22.0 | 100 | 56.1 | 85 |
50 | 29.7 | 135 | 72.6 | 110 |
70 | 36.3 | 165 | 92.4 | 140 |
95 | 44.0 | 200 | 112.2 | 170 |
120 | 50.6 | 230 | 132.0 | 200 |
How to check the wire cross section?
Since the wires most often have a circular cross-sectional shape, the shear area is calculated by the formula:
S = π х d² / 4 or S = 0,8 х d², where
S - cross-sectional area of the vein in mm.kv .;
Π - 3,14;
D is the diameter of the core in mm.
Let's assume, for example, that the wire diameter is 1.3 mm., Then S = 0.8 • 1.3² = 0.8 • 1.3 x 1.3 = 1.352 mm.kv.
With any electrical installation work, you need to remember that with electricity you can not tolerate negligent treatment and do not forgive mistakes. Electrical safety and reliability - this is what you should always strive for in any work with electrical wiring in the apartment, at the cottage or in the house.
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