1 Introduction Original: grounding device Yin Xiaxian of conduction testing should be conducted once a year. ,\. According to previous analysis and comparison of measurement results, has decided the need for excavation, handling. 
 - Excerpt from "preventive test code for electrical equipment"
:,,,\. Original: grounding device Yinxia Xian Yin Xiaxian by detecting the ground can be found short of the pass, while the changes in resistance can be judged by the extent of corrosion, and analyze and compare the results of previous surveys to determine whether the excavation, processing . \. Grounding device Yin Xiaxian of conduction testing should be conducted once a year, and recorded and analyzed.