Graduate novices do electrical design, ask how to choose electrical components!

According to the three-phase circuit calculation i=p ux 3=p (380V multiplied by 3) to get the current size, the circuit breaker is selected by the ampere current.

The cable is also based on the current, there is no very fine formula for the selection, there is a formula for selecting the cable: 10 under 5 hundred on 2 25 35 34 The explanation is that the line below 10 square can carry a maximum of 5 times the size of its cross-sectional area, such as 1 square millimeter can bring a maximum of 5 amperes. In the same way, if more than 100 can only be 2 times, and the cross-sectional area of the cable is between 25 and 35, the current that can be brought is 3 4 times of its cross-sectional area.

As for the io list, I guess you said it wrong, it should be the list of components, it depends on what your cabinet is used for, what devices you need are listed on it, there must be a number, model, manufacturer, **(**), etc. You can ask an old colleague for a sample for reference, and you can do anything twice. If you are talking about the list of signal io points, then you list the input and output, and it will be clear.

I wish you fast growth @! ~

Hello! 1. The selection of the circuit breaker is selected according to the rated current of the circuit, to ensure that when the circuit exceeds the maximum current, the circuit breaker can break the circuit in time and the unit is not working.

2. Of course, the selection of AC contactors is also selected according to the design current of the circuit, which can be above the design current, but it can not be too small, too small and the container will burn out, and a little larger can be!

3. The selection of the cable, according to its cross-sectional area, can be derived from its maximum flow current, the general line below 10 square meters, the maximum current is about 5 times of it; If the cross-section is more than 10 meters, the current value of the handle point is about a multiple of its cross-sectional area!

4. As for the I o list, this is relatively easy, as long as you indicate the use of each of your interfaces, how to mark it, it is best to refer to what you have done before, look at their way, order, try to be the same as it, keep it neat, clear on it!!

Hope it helps you a little!

Oh, the circuit breaker generally chooses the maximum voltage and current consumption of the whole machine, which can only be large, not small, of course, the bigger the better, but the cost increases. The cable is the same as the breaker, when the voltage is constant, it is to prevent the pole from overflowing, and the wire is heated and on fire. . . I o set myself.,Where do you like to get in and out from.。。。

1. Whether there are specific requirements for the manufacturer brand of devices and cables. When this part of the power is determined, you can choose contactors, thermal protection, circuit breakers, etc. according to the rated current of the equipment during operation. The actual cable also has to be selected according to the rated current of the equipment operation.

The wires in the control loop are generally 1 square or squared.

2. The term "electrical components" is an exclusive noun registered with the Ministry of Industry and Information Technology of the People's Republic of China.

The electrical component information address service uses natural language that is easy to understand and remember, and provides information service guidance for mobile phone end users. The user sends service requests through mobile phone SMS, MMS and other ways, and finally obtains the corresponding information reply through the analysis system, and finally realizes direct communication between the user and the information service provider, and the communication method can be in the form of SMS, multi-** SMS, wap, IVR and other diversified forms.

Compared with other traditional information service guidance methods, its biggest feature is "convenient and easy to remember", which is in line with the usage habits of domestic mobile phone users, and can allow mobile phone users to establish an information channel with information service providers "anytime, anywhere, and anywhere", so as to ensure higher accuracy of service while low-cost investment.

According to the requirements of Party A and the actual rated current of the equipment to choose circuit breakers, fuses, cables, etc., cable selection also depends on how you wield, if it is directly buried, it is also required to be armored cables, but generally take the bridge. Signal cables are generally shielded.