The problem recently investigated is actually a very common problem. I used to go to the electrician class, and I was also a person with an electrician certificate. But the whole process is really making me feel that this is the most utilitarian exam-oriented education. I think that the decoration in your own home may be carried out by such a group of people. Think about the future of many electrical equipment. When the weather is hot, it is really Very terrible thing.
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I believe that most people are familiar with this power distribution box:
Have you thought about what is inside?
1. Case 1: Link http://home.focus.cn/msgview/607/121449211.html
The biggest problem on the graph is the line of the phase line from the main switch section to the split switch section. That is to say, the pressure of these cables is different, and the same degree of aging of the wires is different, especially the first segment of the cable is subjected to the current of I1+I2+I3.
Quote a passage from the article:
Another troublesome problem with old houses is the wires. The earliest line was aluminum wire, and it is recommended to replace it with copper wire. There is a safety hazard in the aluminum wire. As for the hidden danger, I can't say it (I am interested in searching for the diary of the predecessor, I remember who I saw it), but now it has been eliminated, the flower here is spent, it cannot be saved.
Wires also have thickness, 4 square meters, 2.5 square meters, 1.5 square meters and so on. Can be interpreted as the concept of a thick water pipe. In theory, the bigger the better. In fact, how much is needed? 4 square is the most expensive, 1.5 is the cheapest, so there is no need to say more :)
Still finish this topic:
The work in the entire household power distribution box is actually done by the power supply bureau regardless of the construction (initial entry) and renovation (internal connection). So there are a lot of problems here. Regarding the nature of the line and the safe flow of the line, you can refer to GB_16895.15-2002 Building electrical installations. Part 5: Selection and installation of electrical equipment. Section 523: Cabling system current carrying capacity 》Definition for reference. From this point of view, GB is essentially equivalent to moving IEC 60364-5-523:199, this material can still be referenced.
In fact, the power of household appliances is designed according to each single channel 2.5MM^2 on the map. At some peaks of power consumption, current will be formed, causing overcurrent on the cable, because the main switch is generally designed according to the home. (Shanghai is generally divided into 20A, 30A and 40A third gear) is higher, then when the four switches are around 10A, the wire harness heat and aging will be very serious, easy to burn the line.
If you connect 2.2KW on such a power distribution box (3.3KW is a bit difficult, when the basic charge is used, the average household appliances are used when scoring), the electric vehicle charging power, assuming 16KWh ~ 24KWh battery, charging 80 %, the time is up to 5.8h ~ 8.7h. Once a day, 300 days a year, you can consider the situation of this power distribution box and wiring harness.
Other case pictures:
1. The company sells it so...
1. An open structure of heating elements with half round stainless steel
reflectors for an optimal use of energy.
2. The Gyros will change direction automatice, if there is a force.
3. Removable and detachable parts for easy clean.
4. The particular broiling result is obtained by alternating heating and
cooling down. The meat fibres do not harden, and the gravy is flavoured
by the spices. This cooking mode results in very healthy meat.
5. The Vertical Grill allows broiling meat layers, shashlik, party sausages,
poultry and fish with few attachments.
6. The Skewers and Gyros go in opposite direction so that the food could
be heated more well.
7. Power: 1400W
Smokeless Electric Grill,Electric Multi Grill,Non-Stick Electric Grill,Electric Bbq Grill
Housoen Electric Manufacture Co., Ltd. , https://www.housoenappliances.com