Circuits are related to many aspects of daily life in homes and are a very important and professional part of home decoration. Among them, the strong electricity refers to the electric part of the electric field. It is characterized by large power, large current, and low frequency. It mainly considers the problem of low loss and high efficiency, and often refers to “weakening electricity†as opposed to it. Here's a detailed discussion of the issues related to the deployment of strong power.
Explain some of the places in the diagram:
How to determine the size of the gate?
The total gate size in the figure is only an example. As for the size, I think it should be based on the size of the entrance line and the size of the upper circuit breaker (ie, a miniature circuit breaker behind a single household meter) or the size of the meter. The current house entrance line requires 10 square meters or more, and the three square lines with 10 square lines are under the PVC pipe concealment mode (with the line length ignored), and the long-term safety ampacity at 30 degrees is 46A. The next 16 squares is 61A.
Of course, the data given by different manufacturers and standard setting units will be somewhat different, but the difference should not be large. According to the conditions of using electric current for safe current carrying capacity of the electric wire (circuit breaker rated current), I think the circuit breakers of 40A and 50A are respectively reasonable and safe for the 10 sq.m. and 16 sq.m. The overall switch is not as big as possible, and the total current of household electricity is not so great. You can't open all the appliances together. Another method to determine the size of the indoor gate is to look at the circuit breaker behind your home appliance downstairs. The rated current of the indoor total gate can only be less than or equal to it. It cannot be larger than it, otherwise the lower switch is bigger than the upper one. no point.
You can also look at the maximum rated current of the meter to determine the size of the indoor gate. For example, the parameter on your meter is 10 (40) A. The number in parentheses indicates that the maximum current the meter can withstand for a long period of time is 40A. In this upper limit value, the measurement error of the internal meter will be within the specified range. If it exceeds this value, metering will be inaccurate or the meter will be burnt. This shows that if you use the above parameters of the meter, then your home line should also be 10 square, indoor maximum gate can only use 40A.
2, the total gate leakage
In order to save money and save time, some people have a problem with missing insurance coverage and do not take the road. I think it is unreasonable. If one point leaks, the total gate jumps open and the entire house will lose power. It's okay during the day, but it's dark at night, so it's more reasonable to have outlets with leaks. There may be people who want to split the road and the total gate leakage protection. This is not impossible, but the leakage current of the main gate must be more than 2 times larger than the road, and it is a model with delay (such as tapping 30MA leakage Value, instantaneous type, that the total gate leakage protection will have the leakage value 100MA, delay type), otherwise a sub-gate and total gate may trip at the same time after the leakage. As mentioned before, if the total gate leakage guarantees 100MA, is the total leakage circuit breaker of the downstairs unit also 100MA? It was impossible to cooperate with them. And so matching will increase costs, home improvement is not necessary.
3, why the lighting divides two ways
The purpose of lighting in two directions is to facilitate the use of power in the event of failure. All the way to lighting can be used in another way. There is no need to touch the torch to find the flashlight. (Some people will say that it can be divided into all the way and the lighting is broken. You can use the socket lamp. Of course, but before the plug-in lamp has to be plugged in black, the desk lamp has a limited range of illumination. If it is a small apartment such as a one-bedroom structure, it is possible to lighting all the way, specifically want to sub-cost or spend a little more than two ways to get ideas.
As for how to divide the two roads, it can be based on actual space. The simple point is the one on the south or the one on the bedroom hall in the north and so on. There are cross points between North and South, this is very flexible and can be based on their own needs. However, no matter how the points should be mastered certain principles, first, all lighting lines must be strictly separated from the socket line (otherwise the leakage protection of the socket will not be used); Second, the power of the two roads lighting should be roughly the same; Third, the bathroom tyrants do not belong to the lighting range.
4th, lighting circuit wiring problem
The bus for lighting circuits should be 2.5 square feet, which is specified in the corresponding specification. As long as the power of each individual lamp is not too large, it is possible to use 1.5 points for the line. But the lighting and all the outlets should be grounded. The original lighting is not equipped with a ground wire. Now the formal method is to bring it, because now the home is basically using type I lamps, and the regular manufacturers produce lamps. There are ground terminals on the ground. In fact, more than a few dollars can be added to the ground line, and the main reason is that it can guarantee the safety during maintenance. Circuit breakers do not have leakage protection, and DPN circuit breakers are suitable.
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