The network cable in the home wiring is generally composed of 8-core oxygen-free copper wire, and then wrapped by an insulating layer. The withstand voltage of this type of conventional twisted-pair cable is 15V. In fact, the working network cable voltage is only 3V, and the peak voltage is About 10V, its maximum withstand voltage is about 15V, and the human body can withstand a voltage of 36V, so the network cable is safe to use.
The maximum voltage value of 15V that the network cable can withstand is a voltage value that will not cause direct death or disability. In a normal environment, the "safe extra low voltage" that the human body allows continuous contact with is 36V. A voltage lower than 36V cannot be sensed by the human body. And the voltage of the AC high-frequency signal of the Ethernet data sending and receiving signal within 100M does not exceed 3V.
The voltage of the network cable in actual operation can be tested by an electric pen. Generally, the voltage value of the AC high-frequency signal of the network cable transmission signal between the computers will not exceed 3V, and it cannot support the excess load. If there is a load demand, you need to use a POE device with a voltage value of about 48V.
The maximum sustainable working voltage of the RJ45 interface is 8V, and the DC voltage of the network cable signal for transmitting telephone signals is 48-50V, which is higher than the maximum voltage that the human body can withstand, and contains a high internal resistance power supply. When off-hook, it is 6-12V DC. There is an incoming call, and the ringing voltage is about 75V AC. It is not safe to touch directly.
The commonly used twisted pair is an 8-core network cable. How much voltage does the 8-core network cable have? 8-core network cable is a common medium used to transmit network signals, and it is also a weak current cable.
If the 8-core network cable is used as a monitoring line, in order to ensure that the operating voltage of the camera in actual applications cannot be lower than 10V, it is best to choose an oxygen-free copper network cable. The oxygen-free copper cable has the characteristics of low resistance and strong transmission signal stability, and the voltage drop value of the terminal will not be too high, which is more guarantee for the normal working state of the camera.
