What is the difference between a weak current and a strong current?

- Aug 16, 2019-

What is the difference between a weak current and a strong current?

Weak current is very common in our daily life. Almost all electronic products like satellite socket, TV socekt, etc. have weak current. Compared with strong current, weak current refers to the current and voltage required to transmit signals. It is characterized by small current, low voltage and high frequency.

Strong current is generally electricity in the power system, such as 220 V lighting, and 1000 V commercial power. It is characterized by large current, high voltage, low frequency.

Here is an example to show you the difference between strong current and weak current. The computer can be divided into strong current and weak current. The power supply of this computer uses large current, high voltage and low frequency to provide power for the equipment. This is strong current.

But other parts in the mainframe are generally low current, low voltage, high frequency signal processing, such as main board, which is weak current.

When selecting a strong current, you only need to refer to the strength of the electric wire. As long as it is not overloaded, as long as it is strong enough, you can use it with confidence. But weak currents, different signals, also require different wires. Moreover, all weak electric wires (network cables, telephone lines, etc.) have internal shielding layers to prevent external magnetic fields from affecting the current frequency in transmission.

In addition to the selection of materials, it is also necessary to protect the weak electricity during installation - away from strong electricity.

Since the current in the strong electric line is large and the magnetic field is strong, it is easy to affect the signal in the weak electric line. Therefore, in the decoration and wiring links, it is necessary to ensure a principle that the weak electric line threading pipe must have a strong electric circuit of at least 50 cm, and the wall can be walked when necessary. It is even more difficult for strong and weak electricity to appear in the same threading pipe.

If it is absolutely necessary, there is no 50 cm distance from the power supply line, then you can use metal threading pipe or shield layer threading pipe, you can reduce the separation distance to 30 cm. If the strong and weak currents need to be crossed, it should be ensured that when they are in contact, the weak electrical conduit is above, and the angle between the strong and weak electrical conduits is 90°, and a shielding layer is formed at the intersection.