2) a reasonable choice to protect access to zero (protective ground) and design grounding resistance. Protect access to zero and the cross-sectional area of ??the protective ground conductor must be calculated to determine the choice and short-circuit current with a shell hit check. Its terminals must be well connected, not allowed to have loose, should always check the quality of the connection. Protected electrical equipment grounding resistance value should not exceed 4Ω, sell high and low voltage power distribution equipment, electrical equipment such as large capacity, melt fusing current is also large, should be increased in parallel grounding wire grounding section or to sufficiently reduce grounding resistance, increased leakage short-circuit current, which is conducive to protective devices. (3) implementation of the equipotential bonding. Leakage protection for single-phase 220V line provides only indirect contact, while there due to mechanical wear and tear, bad, quality and other factors of instability caused by short-lived action failure all the risks, we can not stand alone as a reliable measure of protection Therefore there should implement equipotential bonding in order to effectively eliminate leakage between the metal components of electrical lines or equipment and low potential arcs, sparks generation, namely the elimination of leakage voltage may cause a fire. Equipotential bonding refers to measures to protect access to zero water main bus and buildings, the total gas pipes, HVAC pipes and other metal pipe or wire bonding apparatus, in order to achieve the purpose of the building within a balanced potential, especially for flammable explosive places more of its irreplaceable role. 3.3 to strengthen the electrical design review. Distribution system within the building, high and low voltage power distribution equipment dealers, the relevant departments should be reviewed when the electrical design strictly in accordance with relevant technology, for building interior renovation should strictly enforce the "interior decoration of buildings for fire protection design" without or minimize the use of flammable combustible materials, especially in the electrical circuit through the fuel, wear a metal pipe or flame-retardant hard plastic pipe protection, because of good plastic insulation properties, it can better prevent leakage, the use of metal pipe When wiring, be sure to prevent insulation from being damaged. Distribution equipment (switches, sockets, distribution boxes, etc.) and electrical equipment and fuel should maintain adequate safe distance, really inseparable, insulated protective measures should be prepared. After the completion of the construction, the electrical installation shall be subject to special inspection institutions qualified and put into use, as far as possible to prevent the occurrence of leakage from the source of fire. New development in the drive inverter power industry as an economic production of essential equipment, is widely used in various industries in the field of production and life, especially in the power industry, but is inextricably linked with the drive. We know that the high and low voltage power distribution equipment, today's energy power control system includes a multi-disciplinary technical field, not only to be effective, but also energy-saving, not only high quality but also a high development. Overall, based on the development needs of the modern-related industries, the development trend of the inverter industry are: power, high frequency, controlled by digital and intelligent use of energy-saving cycle. Therefore, as an important power conversion components of the system, the drive is not just the face of a broad market, as well as the growing market demand, and the market demand is not just the number, but also the product quality. Several aspects of the macro-environment for development by 2011 three quarters of the economy, industry, market information, development and other related businesses can understand, the inverter market in the development of the first three quarters of this year rose at steady state potential, although in the meantime there have been Order crunch phenomenon, but the overall impact on the industry's development is not large. With the rapid economic growth, the rapid development of the power industry, will be on the drive increasing demands put forward, in the face of these new developments in the drive industry has become increasingly important. How the industry's future, how the product tomorrow, it will be the most important issue raised by this stage of the inverter industry, the top priority of development. Which high and low voltage power distribution equipment, high and low voltage power distribution equipment, electromechanical Connaught Xi Xi promise by Henan Mechanical and Electrical Equipment Co., Which high and low voltage power distribution equipment, high and low voltage power distribution equipment, electromechanical Henan Xi Xi Connaught Connaught Electrical and Mechanical Equipment Co., Ltd. (www.hnxinuo.com) this year introduced a new upgrade, the above picture is for reference only, please dial this page Phone or pictures on obtain the latest information, contact: Yang Yongjie.