Explanation of common decoration terms in renovati

2022-07-22
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In the process of circuit transformation, faced with the flicker of strong electricity and weak points from the decoration company, the price is becoming more and more expensive. I don't understand these professional terms. Is it very depressed? Therefore, here is to explain some common terms in circuit transformation

in the process of circuit transformation, faced with the flicker of strong electricity and weak points from the decoration company, the price is becoming more and more expensive, and I don't understand these professional terms. Is it very depressed? Therefore, here is to explain some common terms in circuit transformation

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1. What is strong electricity

in the power system, the voltage below 36V is called the safe voltage, in other words, the voltage that will not kill people (except heart patients); The voltage below 1kV is called low voltage; Voltages above 1kV are called high voltage. The line that directly supplies power to users is called distribution line. If the user's voltage is 380/220v, it is called low-voltage distribution line, that is, the strong current in family decoration (because it is the highest voltage used by families). Strong current generally refers to AC voltage above 24V, such as lights and sockets in families, with voltage between 110V and 220V. Lighting fixtures, electric water heaters, heaters, refrigerators, televisions, air conditioners, sound equipment and other electrical appliances in household appliances are strong current electrical appliances

2. What is weak current

weak current wiring system is the fourth essential home infrastructure after water, electricity and gas. For the construction of digital home, this is a basic work, which is very important. The processing object of weak current is information, that is, information transmission and control, which is characterized by low voltage, low current, low power and high frequency. The main consideration is the effect of information transmission, such as the fidelity, speed, breadth and reliability of information transmission. Generally speaking, weak current mainly includes telephone lines, network lines, cable TV lines, audio lines, video lines, audio lines, etc

3. Common symbols represent meaning

a (representing electricity); U (for voltage); I (represents current intensity); R (for resistance); W (for work); P (for power); T (for time); K (quantity unit: thousand); M (quantity unit: millimetre)& mu; (quantity unit: micro); 1A=1000mA1mA=1000μ A1KA=1000A; Ohm's Law: u=ir, power p=ui, work w=uit

4. How to calculate the square of wires

square is the nominal value of wire specifications specified in national standards. The square of wires is actually marked with the cross-sectional area of wires, that is, the area of circular cross-section of wires, in square millimeters, generally divided into: 0.5, 1, 1.5, 2.5, 4, 6, 10, 16, 25, etc. Those below 10 (mm2) are generally called wires, and those above 10 (mm2) are called cables. The square number of wires is an oral term in the construction of decoration and hydropower. It is often said that a few square wires are square millimeters. Generally speaking, the empirical load capacity is about one kilowatt per square wire when the grid voltage is 220V. Copper wire can carry 1-1.5 kW per square meter, and aluminum wire (rarely used now) can carry 0.6-1 kW per square meter. Therefore, an electric appliance with a power of 1 kW only needs one square meter of copper wire. When it comes to current, the copper wire can carry 3a to 5A current per square meter during short-distance power transmission. The heat dissipation condition is 5a/mm2 for good, and 3a/mm2 for bad

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