【正文】 al0, until the pointer on a shake table center scale 0, with stalls multiplied by the dial corresponding numerical result this grounding grounding resistance. Wire grounding is an important electrical safety technical measures, the operation should be serious, serious, ply with the requirements of technical specifications, must not be careless. Therefore, correctly use the ground, normative hanging, remove grounding behavior, consciously cultivate rigorous safety work style, improve their awareness of safety, to resist 5 the danger from thousands of miles away, in order to avoid the ground causes electrical accident. According to the practical work, ground use should pay attention to the following matters. 1work must be checked before grounding wire. Soft copper wire is broken, the screw loose connections, hook line stretch is normal, do not meet the requirements should be replaced or repaired before use. 2 hanging wire must be a priori power, not checking cable grounding is the base of mon habitual violations, in suspension when the grounding body and physical contact. 3 in the work place two segment ends hanging earthing, lest the user would send electric, induction electricity, suffer a number of examples. 4 in the play ground pile, you should dial can borrow to physical fast dredge accident current, grounding the quality guarantee. 5to protect the earth. Grounding wire in use in the process may not be twisted, should not soft copper wire wheel, grounding in removed, not from the air leaving or anywhere to fall, use rope transfer, pay attention to ground cleaning work. 6new staff must go through ground wire using the training, learning, after passing the examination, can the individual engaged in ground operation or use of the work. According to the different voltage levels corresponding to7specifications of the grounding wire selection. 8prohibited the use of other metal wire instead of grounding wire. The 9 grounding wire has two sides, it has a safety function, improper use will produce destructive effect, so after work to timely removal of ground wire. With the earthing switch may damage electrical equipment and the destruction of the power grid stability, can lead to severe malignant electric accident. 10field work not less hanging earthing conductor or alter the articulated ground location. 5 Lightning protection system construction methods and technical measures 6 Lightning protection system grounding engineering major required close coordination, interspersed with civil pleted. In civil unit beam, column and reinforced structure modeling is to follow up the grounding body ( line ) of the lap welding and grounding lead welding. In order to prevent the welding fault leakage, during each lightning protection on the ground ( body ) after welding, are on the main reinforcement is painted in eyecatching mark, for the benefit of a , mesh protection construction method According to the design institute to provide the drawings, using the foundation steel (including pile steel mesh cage bars ) as the lightning protection and grounding, using column within 2main bar as lead, using concrete foundation beam reinforced bar as electrode connection, use of roof beam reinforcing steel bar and reinforced parapet coping as dark installed lightning protection lightning protection construction method: 1straight buried metal pipes and metal top and lightning protection device. 2into the building of buried metal pipeline, roof all the metal pipeline and its structure also and lightning protection device. 3note that in the construction of grounding body ( line ) of the lap length must ply with the following provisions: to2 times its width ( and at least 3edge welding)。 1 Lightning protection grounding Abstract The significance of lightning and mitigation on very little money to prevent large losses, and its function is to use scientific means avoid natural disasters. Grounding is to make the system has been included in the lightning protection lightning energy discharge into the earth, and good grounding can effectively reduce the online guide overvoltage, avoid counterattack. Avoid ground is the most important aspect of technology, whether sings rem, induction lightning, or other forms of ray, ultimately the lightning current into the earth. Therefore, no reasonable and good grounding device is can39。 is connected by double lapped continuous welding of , weld length not less than 6 times the diameter, good weld appearance。共用接地系統(tǒng)通常利用建筑物的基礎(chǔ)做接地極，其接地電阻一般在 1 歐姆以下，如有設(shè)備對接地電阻的要求更低，應(yīng)取其最小值。接地方法：將每個設(shè)備的接地端子單獨接到接地裝置上。 11 (7)接地電阻：接地體或自然接地體的對地電阻的總和，成為接地裝置的接地電阻，其數(shù)值等于接地裝置對地電壓與通過接地體流入地中電流的比值。 (2)掛接地線前必須先驗電，未驗電掛接地線是基層中較普遍的習(xí)慣性違章行為，在懸掛時接地線道體不能和身體接觸。 施工對策 ： (1)嚴格執(zhí)行《建筑物防雷設(shè)計規(guī)范》（ GB50057－ 94）的有關(guān)規(guī)定，保證沖擊接地電阻符合要求 . (2)連接引線不宜直接在鍍鋅鋼管上焊接，宜用焊接或螺栓連接在專用接地線卡上（或金屬管道支架上） . (3)防雷連接引線宜采用暗敷，接地圓鋼焊接時焊縫未熔合，造成有效接觸面積減少，雷擊時會有熔斷的危險 。該方法很適合于城市中采用?，F(xiàn)已普遍采用的電信大樓綜合接地（一點接地）和引入的各種防雷器。 (4)在打接地樁時，要撥能借地體能快速疏通事故大電流，保證接地質(zhì)量。 接地裝置容易發(fā)生腐蝕的部位主要有 ： (1)設(shè)備接地引下線及其連接螺絲； (2)各焊接頭； (3)電纜溝內(nèi)的均壓帶； (4)水平接地體 4 防腐蝕措施 接地體采用銅材、銅包鋼接地體或熱鍍鋅材料； 焊接處刷瀝青漆或銀粉 漆； 采用陰極保護。這有效的避免了設(shè)備之間的相互電磁干擾。過去有些規(guī)范要求電子設(shè)備單獨接地，目的是防止電網(wǎng)中雜散電流或暫態(tài)電流干擾設(shè)備的正常工作。 steel and steel, flat steel and angle steel welding, in order to reliable connection, except in the contact area on both sides of the welding, and weldin