What is the maximum length of the main line of 12 volt voltage lighting?

How many volts of voltage, how much power to drive, how long the transmission line, and the cross-sectional area of the wire is proportional, the greater the load, the thicker the wire, although the power is small, the farther the power transmission, the thicker the wire.

For example: 1. The voltage of 12 volts is 1 square millimeter copper wire with a 12-watt bulb, and the longest wire should not exceed 20 meters.

2. If the voltage of 12 volts drives a 24-watt bulb, the cross-sectional area of the copper wire needs to be doubled, and the longest wire should not exceed 20 meters.

2. It is still a 12-volt voltage, or a 24-watt bulb with a square millimeter copper wire, and the longest wire should not exceed 10 meters.

This is not limited to 12 volts by Brother Yang, because the voltage is too low, and the transmission distance is very close, so it is best not to exceed ten meters.

Theoretically, it can be lit up for hours. 12*12 10=hours, but the battery will not be used up in actual use, and it is a reasonable 12*12*hours according to the 80% usage rate.

Depending on the situation, you will need to give the load and the voltage fluctuation range of the load.

No matter how many volts of power supply, the transmission distance is long, the terminal voltage will be very small, because the wire also has resistance, the longer the wire, the greater the resistance, and a lot of voltage will be divided.

As long as the diameter of your wire is thick enough, you can send a few hundred meters no problem.

This is a professional question, and the only way to put the line is to ask the professionals, who should know best.

The length is related to the wire diameter and load current, which should be calculated.

The longest distance of 12 volt low-voltage lighting wiring should be between 30 and 50 meters, and the best thing to do is not too long, if it is too long, there will be a voltage drop, and the voltage of 12 volts cannot be reached.

There is no limit to the maximum distance of 12V low-voltage lighting wiring, depending on the fineness of the conductor and the size of the negative stool source load. The thicker the wire, the smaller the load, and the longer the distance supported; The thinner the wire, the greater the load, and the closer the distance supported.

Normally, the resistor consumes no more than 10% of the rated voltage of the electric state coarse noise. That is, no more. It can be based on the resistivity of the wire.

The square number of wires.

And, the size of the lighting load (the magnitude of the current) to calculate the longest distance.

There are no rules! The general rule is: Nearby!

Use copper core wire of 4 square or more.

Electric light is a device that converts electrical energy into light energy to provide illumination, which appeared in the second industrial revolution and works on the following principles:When the current passes through the filament (tungsten filament, the melting point is more than 3000), the spiral filament continuously gathers the heat, so that the temperature of the filament reaches more than 2000, and the filament emits light when it is in an incandescent state, just like the red-hot iron can shine.

The higher the temperature of the filament, the brighter the light emitted. Therefore, it is called incandescent lamp, from the perspective of energy conversion, when the lamp emits light, a large amount of electrical energy will be converted into heat energy, and only a very small part can be converted into useful light energy.

The light emitted by electric lamps is panchromatic light, but the proportion of each color is determined by the luminescent substance (tungsten) and temperature. The imbalance in proportions leads to a color cast in the light, so the color of the object is not realistic under incandescent light.

Power-saving tips: Choose energy-saving lamps: fluorescent lamps save electricity compared to incandescent lamps. The brightness of the 20-watt fluorescent lamp is even better than that of the 40-watt incandescent lamp (a better environmentally friendly and energy-saving product, the LED fluorescent lamp, 2 watts can replace the 40-watt incandescent lamp.)

4 watts can completely replace 20 watts of ordinary fluorescent lamps and 20 watts of ordinary energy-saving lamps).

Make the most of reflections and reflections: Illuminance can be improved by fitting the lamp with the right reflector. The use of the reflection of the indoor wall and the white wall can also improve the illumination by about 20%.

Keep the bulbs and shades clean to ensure the highest illumination and light reflection.

The installation height should be appropriate. For example, a 20-watt fluorescent lamp, if it is installed 1 meter high, the illuminance is 60 lux; Michael is Lux. Lowering the height appropriately can reduce the wattage and save electricity.

Only LED departments can do it If it is installed 2 meters high, the illumination is about 200 lux; 3 meters high, about 96,200 lux) said that it is often useful to use LED lighting products to save energy and the length of lighting.

Good question, there is a voltage drop on the conductor resistor, which will lose voltage and power.

Generally, the line voltage drop is not more than 10%, and the line voltage drop of 12V should not be exceeded, depending on how large your load current is.

S = i*l (y*δu), where s is the cable cross-sectional area, i is the current, l is the cable length, y is the conductivity coefficient, copper is 57, and δu is the allowable voltage drop.

Taking 1A current as an example, with a cable with a copper core cross-sectional area of 1 square millimeter, the voltage drop does not exceed 1 = 1 * l (57 *, l = meters, note that this is the whole round trip meters, and the distance from the load to the power supply is meters. If you want to connect further, you need to thicken the cable, for example, if you use a cable with a copper core cross-sectional area of 4 square millimeters, you can extend the distance from the load to the power supply to meters.

Office lighting circuits are mainly limited in the maximum load current and power: "Code for Electrical Design of Civil Buildings" JGJ16-2008 The current of each single-phase branch circuit in the lighting system should not exceed 16A, and the number of light sources should not exceed 25; The current of each single-phase circuit of large-scale building combination lamps should not exceed 25A, and the number of light sources should not exceed 60 (except when LED light sources are used). When the sockets are separate circuits, the number of sockets in each circuit should not exceed 10 (groups); The number of sockets used for computer power supply should not exceed 5 (groups), and Type A residual electrical activity should be used as a protection device.

The specification stipulates that the protection switch of each lighting circuit should not be greater than 16A, taking into account the wire loss and connection joint impedance, the maximum power should not be greater than 2KW under normal circumstances, and the civil regulations stipulate that the connection lamps and lanterns of each lighting circuit should not exceed 20, and the socket should not exceed 10.

Yes! No more than half the length of two poles.

Do not exceed 500 meters (if you exceed it, there will be a voltage drop, and the voltage is not enough).

More than 20 meters, a pole should be erected in the middle.

Lighting wires in your home.

Lighting wires are squared. Generally, the power of the home lighting load is not too large, and there are almost 6-8 lamps in the dining room, living room, main and secondary bedrooms, balconies, kitchens, and bathrooms, which are controlled within 1500 watts, and the square national standard copper wire is enough.

Wire for water heater socket.

The water heater is relatively large in household appliances, it is recommended to use 4 square wires, 4 square copper core wires can allow a maximum load of 7000-8000 watts, and the limit value is 8000 watts. Therefore, even if the water heater or bath bomb is turned on at the same time, there will be no major problems, and even if it is overloaded, it will only trip.

Wires for air conditioning outlets.

The air conditioner is also a high-power electrical appliance at home, so the socket is also a 4 square wire, of course, you can also use 6 square wires, but the construction difficulty of doing so will increase, and the area occupied by the socket bottom box will also become larger, and the wiring will become a very troublesome thing.

Wires for ordinary outlets.

The ordinary socket at home can use square wires, and the general load is controlled within 2500 watts. However, if you often use high-power electrical appliances, it is still recommended that you choose a 4 square wire.

Wires for kitchen outlets.

It is recommended to use 4 square wires for kitchen sockets, on the one hand, because there are many appliances in the kitchen, and on the other hand, because of the high frequency of use. Some kitchens are a square line to the top, and then arrange the socket below, with a square wire to connect the fire, all the sockets are connected from the square line separately, therefore, this practice is no problem.

Enter a multi-storey house to give a 70

Each house is 10 square meters.

The household voltage in China is generally 220V

Linear current in square millimeters 10A (A); Carrying power: 10A, 220V, 2200W.

The square millimeter of the line current is 16A (A) min; Carrying power: 16A 220V 3520 watts.

4 square millimeters of line current 25A (A); Carrying power: 25A 220V 5500 watts.

6 square millimeters of line current 32A (A); Carrying power current 32A 220V 7064 watts ordinary sockets can be squared, switches and lamps are squared. Air conditioning with 4 squares. If there are many electrical appliances in the kitchen and bathroom, you need to use 4 square meters.

The total power cord is available in 6-10 square meters.

Calculation of the length of the electric lighting wire: wire length = (horizontal + vertical + reserved) (1 + relaxation, wave type curvature, crossing coefficient).

1. Horizontal length: the horizontal distance length from the lamp to the lighting box;

2. Vertical length: the distance between the installation degree of the lamp and the roof, and the distance between the lighting distribution box and the roof or floor.

3. Reserved length: The reserved length in the lighting distribution box is half the circumference of the box (box length + box width), and the reserved length in the junction box (generally 150mm cores).

4. Corrugation, turning and crossing coefficient: generally take the total length.

This circuit is connected to all the switches.

The lamp is with two, the socket with 3 wires, the power line is in the switch box, the ceiling is under two to the switch box on the line, if the switch controls two lamps, the line from the ceiling to the switch position is counted as 3, one is the zero line, the two lamps are shared, and each lamp has a control line.

That's too good. The lighting is all DC 12V power supply, and you can directly use 12V power supply LED strip light. It adopts 12V switching power supply, not a transformer.

The capacity of the switching power supply is matched according to the capacity of the lighting you install, the LED lighting fixtures are power-saving, and the 200W switching power supply should be fine.

Why do you want to use 12v? Is it safe? 220V is as safe as a leakage protector. 12V is also not convenient for you to use other electrical appliances.

220 to 12 volts 1 kilowatt transformer voltage is enough for you, but the lighting brightness is not ideal, I hope it can help you.

No problem now. What's the point? The voltage drop is nearly 20 times, and the wires used have to be thickened by 20 times.

There are no rules!

As long as the wire is thick enough, the distance can be far enough.

By calculating the voltage drop, as long as the data is within the allowable range.

Because the wire cannot be infinitely thick, usually the 12V low-voltage lighting wiring does not exceed 50 meters, and the terminal voltage is mainly calculated according to the load size.

Assuming 12V, 300W, current of about 25A, with 25 square copper wire, 50 meters away, the terminal voltage calculation result is 10V. The voltage is not too low.

Check the formula to calculate it yourself, there are similar cable calculation software on the Internet.