Windows 7 has been released for nearly two years. During this period, its market share has been steadily increasing. According to data released by market research firm StatCounter, the market share of Windows 7 has exceeded 33%, which means that one out of every three computers in the world has Windows 7 installed. Windows 7 completed the RTM version on July 22, 2009. In August 2010, its market share exceeded Vista. However, Windows 7 still needs to work harder, because it still cannot exceed Windows XP today. Although it has been available since 2001, XP still dominates the operating system and has a global market share of 45%.
Control cable is a kind of cable. It is used for control and monitoring circuits and protection circuits with AC rated voltage of 450V/750V and below. Shielded control cables are widely used in power plants and power stations due to their good shielding performance. They are intended to be laid indoors, in cable trenches, in pipelines, directly buried, in shafts and other fixed places that can withstand greater mechanical tension.
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1. DC rated current Uo/U is 450/750V2. The maximum allowable long-term operating temperature of the cable electrical conductor is 70 ℃.
3 The working temperature during cable laying shall not be lower than 0 ℃. If the natural environment temperature is lower than 0 ℃, the cable shall be heated.
4 The strongly recommended allowable bending radius of cable is below:
The unarmoured cable shall not be less than 6 times of the cable diameter;
Armored cable or copper foil shielded cable shall not be less than 12 times of cable diameter;
The shielded Flexible Cable shall not be less than 6 times of the cable diameter.
5 Productive cable model 2-61 cores
6 Control cables are generally laid in rooms, cable trenches, pipelines and other fixed sites.
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