A low voltage in the control circuit can never cause electric shock, right?

It cannot be said that a low voltage in the control circuit will never cause electric shock. Although low voltage reduces the risk of electric shock, whether an electric shock will occur still depends on several other factors: 1. Voltage level: Indeed, lower voltages (usually considered to be no more than 50 volts for direct current or the peak value for alternating current) are in most cases not sufficient to penetrate human skin and cause an electric shock, especially under dry conditions. However, if the skin is moist, there are wounds, or other conductive paths exist, even a low voltage can cause dangerous currents to flow through the body. 2. Current and its duration: The magnitude of the current and the duration for which it acts on the human body also affect the risk of electric shock. Even a very small current, under certain conditions and if it persists long enough, can potentially cause cardiac fibrillation or other physiological effects. 3. Human body resistance: Human body resistance varies from person to person and is influenced by various factors, such as the condition of the skin (humidity, thickness, and level of cleanliness, etc.). 4. Environmental conditions: Factors such as high humidity and conductive environments (e.g., standing in water) can reduce human impedance, potentially making low-voltage electric shock possible. Therefore, even the low-voltage operation panels and buttons in control circuits should be designed and maintained in accordance with relevant safety standards to ensure safe use and minimize the risk of electric shock. It is very important to take appropriate safety measures when performing any electrical maintenance or operations. .

You might as well say that there will be no electric shock as long as nothing goes wrong with the circuit. If an accident happens, you won’t know what might be above what was originally at low pressure.

Any voltage exceeding the appropriate safe level can cause electric shock, and even death

The control voltage is often 220V; it can still be fatal if electric shock occurs

If you say that, people will laugh at you – it depends on the specific operating conditions. In some control circuits, the voltage is 220 volts, while in those where high explosion-proof standards are required, 24 volts is used as the voltage for the control circuits.