First, what is the meaning of cable square?
We often say 1.5, 2.5, 4, 6, 10 square lines, this indicator refers to the cross-sectional area of ​​the wire. The 1.5 square line is a 1.5 square millimeter wire. When we choose cable wires, there is also an indicator - current carrying capacity. The current carrying capacity is the maximum current that can be continuously carried by the conductor under the specified cross-sectional area without causing the steady temperature to exceed the specified value. Generally, the safe current carrying capacity of copper wires is 5~8A/ mm2 , and the safe current carrying capacity of aluminum wires is 3~5A/ mm2 .
For example, the recommended value of 2.5 mm2 BVV copper wire safe current carrying capacity is 2.5×8A/ mm2 = 20A, and the recommended value of 4 mm2 BVV copper wire safe current carrying capacity is 4×8A/ mm2 = 32A.
Second, how to choose cable and wire for home decoration?
In practice, for example, if you need to connect a 1000W electrical appliance, then I=P/U=1000/220=about 5A. Usually, the current carrying capacity of one square is about 5A-8A, then one square line is enough. Of course, the premise is that the national standard copper cable, if it is aluminum, at least 1.5 square.
illumination
1, home improvement commonly used 1.5 square line as lighting circuit, to ensure the maximum use of 2500W lamps, some bathrooms installed Yuba, power may reach several hundred W or even thousands of W, it is recommended to switch the lighting line to 2.5 square, can guarantee about 4000W power The lamps and baths are safe to use at the same time.
socket
2, other household outlets commonly used 4 square lines, can be connected to the maximum 220V * 32A = 7000W electrical appliances at the same time safe use.
The lighting and socket lines are used separately. It is not allowed to take power from the lighting line. It is used as a socket. The standard and specification are the premise of safety.
air conditioning
3. It is recommended that the air conditioning unit be separately routed from the electric control box. Because the residential outlet line is mostly connected in series, it is not recommended to let the line run at full load, accelerate aging and increase risk. More than 3 air conditioners generally use single-core wires of 4 square meters or more.
Instant water heater
4. The hot water heater is popular because of its power saving, small size and beautiful appearance. At present, it is very popular, but it is also a large consumer of electricity when operating, ranging from 3000W to 6000, 7500, 8000W or even higher. Therefore, the installation of instant water heaters, more than 6000W must be separately routed from the electrical control box, more than 7000W, 6 square lines below 10KW, and the corresponding leakage current air switch, choose the brand's wire and cable It is not cheap to save money, so as to avoid danger during use.
(cable usage estimate)
National standard line
5, all wires, must choose the national standard line, pay attention to the manufacturer, whether it is the sheath, or wear the tube, we must pay attention to the brand.
Other household electric appliance
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