【正文】 in the special grounding wire card ( or metal pipe bracket ).The 3lightning protection connection lead should be concealed, grounding bar welding not fusion, resulting in effective contact area is reduced, the lightning will fuse countermeasures:Construction should pay attention to the appropriate electrode angle, swing, pay attention to the melting of lap joints on both sides.,Earthing and equipotential connection:1 all electrical equipment metal shell, frame, line pipe, cable bridge must have good ground, make it a good grounding for outdoor grounding bar welding length not less than 6times the diameter of round steel, flat steel two surface welding。 the connection between the flat width for2 times, three surface welding。 round steel and flat steel bar connection for6 times, two surface galvanized round steel welded beam in foundation of the main grounding bar, and small ground lines are connected, in the connection equipotential box galvanized plate, welding seam must be full. Indoor draught to the equipotential box is connected with the circuit to be connected is plete, the grounding wire specifications of not less than 4mm2, and ensure reliable ground connection of all welds must oil antirust paint two times ( with the exception of concrete structure welding )。 galvanized grounding bar, flat steel in the underground buried depth should not be less . 7 Importance of grounding and lightning grounding resistance testing 8 Lightning protection and grounding technology,In order to solve the munication work (including the user terminal ) overvoltage protection for the purpose, has developed a variety of lightning protection and grounding technology, these are to ensure the reliability of telemunication work technology, is the important basic technology in the field of munication. Now monly used by telemunications building integrated earthing( grounding ) and introduces a variety of lightning protection device. But, now has access to the optical fiber munication era, even in the munication work of the user terminal, at the same time, and connected to an AC power line, at the user terminal using the large scale integrated circuit is more and more, the new features of the lightning protection and grounding, raised new requirement, we must try to adapt to these new resistance test technology. In recent years, because of digital technology and the development of optical munication technology, so that the original installation in a telephone exchange part of the exchange, transmission equipment to the user mobile, and often these devices are mounted to the general residential buildings and overhead, so ask them with the telephone exchange room floor shielding effect, it is obviously not possible, then how to do? Now hand requires these devices improve the adaptability, on the other hand, in order to prevent the leakage of electricity and lightning voltage on human body and equipment hazards, grounding and lightning protection is the grounding purposes, especially for outdoor equipment grounding, leakage current and lightning protection is particularly important. The grounding resistance requirements, technical standards are clearly defined, it is. In order to ensure that the grounding resistance value to meet the requirement, after construction of the grounding resistance testing work is very necessary. But with the progress of the modernization of city, now the city roads and sidewalks are all concrete pavement asphalt pavement or covered now, if still use auxiliary electrode method to test the ground resistance, it is difficult to too much. The new ground resistance test method are 1, the existing ground resistance test grounding resistance is equal to the grounding electrode potential and the injected current ratio. The current earth resistance test method, as shown in figure 1. Where E is the grounding electrode, C is injected into the current of the auxiliary electrode, P is to test the potential of the auxiliary electrode imaginary reference point. Test, signal device in the E ~ C electrode with500 ~ 2KHz AC current by the dotted line into a flow, a current meter and a voltage meter readings, we can find the grounding resistance value. In order to test the value of accurate, the distance between the electrodes shall be not less than 10meters. The distance, in the downtown area of the city, is often difficult to do. 9 防雷接地 摘要 防雷減災的意義在于用很少的錢預防大的損失 ， 其作用在于使用科學的手段規(guī)避自然災害 。 接地就是讓已經納入防雷系統(tǒng)的閃電能量泄放入大地，良好的接地才能有效地降低引下線上的過電壓 ,避免發(fā)生反擊。接地是避雷技術最重要的環(huán)節(jié)，不管是直擊雷、感應雷、或其他形式的雷，最終都是把雷電流送入大地。因此，沒有合理而良好的接地裝置是不能可靠地避雷的。接地電阻越小，散流就越快，被雷擊物體高電位保持時間就越短，危險性就越小。 關鍵詞： 防雷 。接地 。電流 。電位 1 介紹 近年來，很多國內外的標準不主張信息設備采用獨立的接 地裝置，推薦采用共用接地系統(tǒng)。例如， 2021 版的 GB5005794《建筑物防雷設計規(guī)范》中明確指出：“每幢建筑物本身應采用共用接地系統(tǒng)”即將建筑物內的各種接地都統(tǒng)一接到建筑物的基礎上，或室外的接地裝置上。當該建筑物遭受雷擊時，電力系統(tǒng)的電壓和電子設備工作接地的電壓同時上升，保持了設備的工作電壓不變，使電子設備在雷擊時可正常工作。共用接地系統(tǒng)通常利用建筑物的基礎做接地極，其接地電阻一般在 1 歐姆以下，如有設備對接地電阻的要求更低，應取其最小值。 接地就是讓已經納入防雷系統(tǒng)的閃電能量泄放入大地，良好的接地才能 有效地降低引下線上的電壓 ,避免發(fā)生反擊。過去有些規(guī)范要求電子設備單獨接地，目的是防止電網中雜散電流或暫態(tài)電流干擾設備的正常工作。 90 年代以前，部隊的通信導航裝備以電子管器件為主，采用模擬通信方式，模擬通信對干擾特別敏感，為了抗干擾，所以都采取電源與通信接地分開的辦法?，F(xiàn)在，防雷工程領域不提倡單獨接地。在 IEC 標準和 ITU相關標準中都不提倡單獨接地，美國標準 IEEEStd11001992 更尖銳地指出 :不建議采用任何一種所謂分開的、獨立的、計算機的、電子的或其它這類不正確的大地接地體作為設備接地導體的一個連接 點。接地是防雷系統(tǒng)中最基礎的環(huán)節(jié)。接地不好，所有防雷措施的防雷效果都不能發(fā)揮出來。防雷接地是地面通信臺站安裝驗收規(guī)范中最基本的安全要求， PLC 的接地屬于低壓電器設備的 2 單點接地方式 低壓電器設備的單點接