Underground cable don’t use poles, porcelain insulators, cross arm, cable and other materials, so you can save a lot of steel, cement.
Since the underground cable is in the ground, less susceptible to attack the storm, snow ice and other natural disasters, there is no common inverted pole overhead lines, break and other accidents; while eliminating the power lines and telephone lines, closed-circuit cable television, radio, cable cross-spanning conflict, but also less prone to physical shock casualties, even burying break ground leakage, reflected in the step voltage on the ground is also very small (less than about 2 V), to further protect the safety of people's life and property.
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