Note frequency control cabinet maintenance and repair of the 21st century, the domestic inverter technology has been rapid development, has been widely used in various industries of the national economy, promote energy saving, which greatly improves the electrical transmission of industry Level. But with the promotion and application of the drive, we need to pay attention to and dissatisfied outstanding issues slowly surfaced. Here's to study the frequency control cabinet maintenance and repair problems. 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, high and low voltage power distribution, should always check the quality of the connection. Protected electrical equipment grounding resistance value should not exceed 4Ω, 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, high prices and low voltage power distribution equipment, 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, the departments concerned should be reviewed when the electrical design strictly in accordance with relevant technology, for building interior renovation should strictly enforce the "architectural interior design for fire protection", without or minimize the use of flammable fuels materials, high and low voltage power distribution box, 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, high and low voltage power distribution box price, when metal tube 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. High and low voltage power distribution manufacturer, learning Connaught electronics, high and low voltage distribution provided by conventional Connaught Mechanical and Electrical Equipment Co., Ltd., Henan. Henan Xi Connaught Electrical Equipment Co. (www.hnxinuo.com) located in the south China city of Zhengzhou Area 6B 6B-3-342. Scraps and development in the wave of market economy, the current study Connaught Electrical and Mechanical has a high profile in the electronics, electrical products processing, enjoys a good reputation. Xi Connaught Electrical and Mechanical made whole network business alliance certification, marking our service and management level has reached a new height. Xi Connaught Electrical and Mechanical staff is willing to joint development with all people a better future.