The professional skills of good distribution cabinet after-sales service personnel can be measured from the following perspectives: 1. Electrical knowledge level Theoretical knowledge can be tested through simple questions and answers to test the after-sales service personnel's mastery of basic electrical knowledge. For example, ask them about the working principles and functional characteristics of basic electrical components (such as circuit breakers, contactors, relays, fuses, etc.) in the distribution cabinet. A professional after-sales service personnel should be able to clearly explain the short-circuit protection and overload protection mechanisms of the circuit breaker, as well as the fusing characteristics of different types of fuses. Understand their understanding of the electrical system of distribution cabinets, including the principles of three-phase electrical systems, power distribution methods, and the role of busbars. The mastery of complex electrical systems, such as the automation control principles of smart distribution cabinets and communication protocols (such as Modbus protocol), can also reflect their theoretical level. Knowledge Update Electrical technology is constantly developing, and excellent after-sales service personnel need to keep up with the latest developments in the industry. You can ask them whether they know about the latest electrical component technology (such as new energy-saving contactors), updates to safety standards for power distribution cabinets, etc. They should be able to regularly attend training courses or industry seminars to acquire new knowledge and apply it in real-life situations.