Failure to require the installation of the cable. Pull the lever is usually installed in the corner, branch rod Tension rod, bar or straight pole terminal, is reinforced cement pole balanced line measures of stress. But sometimes during the design or construction of the line 15 meters when the weight of cement poles, only consider how to reduce the cost of the line, or only consider the degree of difficulty as a result of the construction of the cable installation is not difficult to handle, resulting in deletion of the line cable. Another reason, is only based on the experience of simply considering the usual 15 meters cement poles plant, but did not carefully check that where you can not install the cable, causing the cable to be installed at the failure to require installation. Pull missing, causing overturning line towers, mainly the stability safety factor (according to design requirements, the requirements of the coefficient is: straight lever 1.5, 1.8 Tension rods, corner bars and terminal pole 2.0) , resulting in avoidable poles tilted down rods, broken poles and other accidents. PULL not used insulators. "Technical Specification for low-voltage power rural" DL499-2001 (hereinafter referred to as "Regulations") Section 6.6.15 stipulates: "through or near wire pole cable must be installed with the same cable line voltage cable insulators insulator. wire should be installed in the lowest 15 meters below the wholesale price of cement poles, cable insulators should ensure the following circumstances pull off, pull the insulator from the ground should not be less than 2.5m. "This is to prevent someone shaking cable or wire and other causes Pull the cable caused by contact energized electric shock. This is a provision that is absolutely necessary, and it is very strict, but in practical work and life, because of the distribution line insulators or cable is not installed because the installation does not meet the insulator is still relatively widespread existence "rules" requirement. To some extent, also planted a security risk. 15 m cement poles 15 meters plant _ Anhui cement poles _ Kyushu Electric Power Tower by Kyushu Electric Power Tower Henan limited liability company. Kyushu Electric Power Co., Ltd., Henan tower company (www.hnganta.com) strong, credible, in other industries in Henan accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Kyushu Electric Power tower and you hand into the brilliant, for a better future!