The power line is also called power supply line, equipment line, transmission line, connection power line, power supply line, equipment power supply line, etc., it is the conductor for transmitting current, and the current transmission mode is point to point transmission. In terms of use, the power line can be divided into DC DC power supply line and AC AC power line. And there are many kinds of AC power lines, from the use of materials can be divided into the following:

1, shielding insulation power supply line: all kinds of electrical equipment for mobile connection can be applied in general, and also suitable for electric mobile equipment connection.

2, general rubber plastic power cord: used for AC rated voltage 450V to 750V and below electrical equipment, power, lighting, telecommunications equipment and instrumentation connection and internal power cord installation line.

3, rubber plastic soft power cord: mainly used for power lighting connection, instrument and meter, medium and light mobile electric appliances (household appliances, electric tools, etc.); most of which are AC 300C level, and the working voltage is 750V or less.

4, general rubber sheathed rubber power line: the scope of general rubber sheathed rubber power line is very wide, where the requirements are mobile electrical equipment connected to the general situation, including the workers and peasants of electrical insulation and mobile devices for power line connection in each department.

5, mine rubber power line: mainly used for mining ground and underground power line equipment and special rubber products, involving mining electric power line communication, rubber and lighting equipment with rubber power line, mining and transport rubber power line, rubber cap lamp power line, mine substation power supply rubber power line.

In addition to the above, there are earthquake rubber power lines, drilling rubber power lines and so on. Because each country uses different specifications and systems of AC power, so each country has different safety certification standards for AC power lines. For example, China is CCC (3C) certification, United States for UL certification, UK for BS certification, Australia for SAA certification, European VDE certification and so on.