【正文】 good probe. In the shake table select file and then to 120RPM speed swing table, side table edge with a shake shake table can dial0, 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)。 steel and flat steel connections, its length is6 times the diameter of round steel。 the connection between the flat width for2 times, three surface 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 gen