1. High-voltage: refers to the electrical connection wires with AC voltage 1000 volts or DC voltage 1500 volts ... According to the definition of 2. 1 in GB/T 2900.50-2008, high [electrical] voltage usually refers to higher than1. In some cases, it refers to the voltage level transmitted in the power system.
2. Low-voltage electricity: refers to the electrical connection wires with AC voltage below 1000 volts or DC voltage below 1500 volts in the distribution line.
Extended data:
Safe voltage does not exceed 36V AC and 50V DC. In the power system, the AC voltage level of 1000K V and above supplies power to UHV, which is usually only used as a long-distance transmission line because it can reduce the energy loss during transmission. Different fields use different voltages. ) Because according to the formula of P=IU, in order to reduce the loss of electric energy in the transmission process, it is necessary to reduce the current, and to ensure the total power unchanged, it is necessary to appropriately increase the voltage and finally reach the user's home through the step-down substation.
Compared with ordinary power supply, high voltage electricity has its special hazards. There are two special cases of high-voltage electric shock: one is high-voltage arc electric shock. Second, step voltage gets an electric shock. Because of the high voltage, it is easy to get an electric shock. So pay attention.
Generally speaking, the influence of high voltage electricity on human body lies in electric shock and electromagnetic wave. When working around high-voltage electricity, appropriate protective measures should be taken and a safe distance should be kept, otherwise the high-voltage electricity should be cut off before construction to avoid electric shock.
Overhead power line protection area is a safe area that must be set up to ensure the safe operation of the built overhead power lines and ensure the normal use of electricity in people's lives. In densely populated areas such as factories, mines, towns, market towns and villages. The overhead power line protection zone is an area in two parallel lines formed by the sum of the horizontal distance after calculating the maximum wind deviation and the horizontal safe distance from the building after calculating the wind deviation.
Low voltage has different definitions in different countries. According to the standards of the International Electrotechnical Commission (IEC), low-voltage electricity refers to alternating current of 50 to 1000 root mean square volts or direct current of 120 to 1500 volts.
References:
High pressure-Baidu encyclopedia
Low voltage electricity-Baidu encyclopedia