Compare Ground Connection and Zero 1, protective ground and protect access to zero in the same place 1) in the low-pressure system, are caused by technical measures to prevent leakage of electric shock. 2) calls for ground and then zero in roughly the same place. 3) Ground Connection and Zero are required to have some grounding device Henan distribution room, such as the protection grounding device, grounding devices and grounding repeated, and that the construction of each grounding device grounding and ground line connections are basically the same. 2, protective earth and protect access to zero at different points 1) to protect low-voltage systems with different principles to protect the fundamental principle is to limit the leakage to ground-to-ground voltage equipment, so as not to exceed a safe range. Protect access to zero is the formation of single-phase short circuit Henan distribution room cost, prompting protector rapid action by the line then the zero line so that when the device leakage. Secondly, the protection system to protect access to zero and repeat ground zero line has a certain blood pressure. 2) the scope of different grounding for general low pressure ungrounded power grid, protect access to zero applied to the neutral point directly grounded low-voltage grid .3) line structures of different protective ground system only protected ground. Protect access to zero system There must be zero line of work, work the ground and repeat the ground, if necessary, protection of the zero line and the zero line separate measures to reduce ground resistance: higher resistivity soils (such as rocks, frozen and long sandy soil) , to meet the requirements of the grounding resistance is difficult to reduce the grounding resistance can take the following measures: 1, using a low resistivity clay, black soil and sandy soil instead of the original high resistivity soil, generally replaced Grounding the upper third of the length of the power distribution Nanyang room construction, the surrounding soil .2 0.5 m or less, to increase soil sand burial depth grounding. Deep also can not consider the dry soil freezes and increased impact resistance coefficient .3 artificial soil treatment, in general, appropriate to add salt in the soil, according to the experimental results, with salt soil, the sandy clay of resistance is reduced 1/3 ~ 1/2, sand resistance reduced by 3 / 5 3/4, sand resistance can be reduced 7/9 to 7/8, for rocky soil, after impregnation with a salt solution, its conductivity can be increased 70, 1200 to increase the conductivity of granite times but the soil After manual processing, reduce the thermal stability of the grounding, grounding accelerated corrosion, reducing the grounding life. Therefore, any time you can use a natural way to achieve the grounding resistance, generally do not use manual processing methods .4, for freezing After the soil during manual processing, but also when meet the requirements, the best body buried in the ground beneath the building, or in the winter using fill method peat Nanyang distribution room construction, Fu Long electricity (certified), distribution room provided by Nanyang Fu Long Electric Power Engineering Company Limited. Nanyang Fu Long Electric Power Engineering Co., Ltd. (www.nyfulong.com) is Nanyang, Henan, transmission equipment and materials leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Teflon power in leadership with the staff warmly welcome all inquiries negotiations to create Teflon electricity better future.