Whether DC power can kill people depends on the magnitude of the current through the human body, and it has nothing to do with AC DC.
Our commonly used lighting (alternating current) uses three-phase four-wire power supply, three-phase three-line, the alternating current phase difference is 120 degrees, the other line is called the neutral line, and the transformer is connected to the underground, also called ground or neutral. When the three-phase is balanced, its current is 0, which can be omitted (ie, three-phase three-wire power supply, used before the transformer). It is difficult to balance the three-phase power of the customer terminal, and the neutral line is required.
There are several types of electric shocks, such as touching two fire lines and one hot line and one neutral line. This can form a circuit, and a current flows through the human body. When a person touches only one fire line, if a person is connected to the earth, it also constitutes a circuit. The current flows through the human body. Then there is a stepping electric shock. When the high voltage is grounded, the earth has a resistance, and an area where a voltage is formed outward at the grounding point. When a person enters, there is a voltage between the two feet, and a current flows through the human body.
However, DC power is different. It must be powered by two wires. It is necessary to contact the two power cables at the same time to form a circuit. The chance of electric shock is greatly reduced. There are fewer places for high-voltage DC power supply, and there is less electric shock. This is not the case. DC power is not dead.
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