Mechanical and electrical equipment generally refers to machinery, electrical appliances and electrical automation equipment, in the construction of more refers to in addition to geotechnical, carpentry, steel, mud and water outside the machinery, piping equipment collectively. It is different from the hardware, multi-finger can achieve a certain function of the finished product.

Classification of electromechanical equipment. There are many kinds of mechanical and electrical equipment, and the classification methods are also varied. "National Economic Industry Classification and Code" (GB/T4754--2002) on the mechanical and electrical equipment has a detailed classification, this classification method is often used in industry equipment asset management, mechanical and electrical products catalog information manual cataloging. In addition, mechanical and electrical equipment can be divided into three categories according to its use, namely, industrial mechanical and electrical equipment, information mechanical and electrical equipment and people's livelihood mechanical and electrical equipment.

Industrial electromechanical equipment refers to the equipment used in production enterprises, such as all kinds of mechanical processing equipment, automated production lines, industrial robots used in the machinery manufacturing industry, as well as mechanical equipment used in other industries, such as textile machinery, mining machinery, etc., all belong to the industry Class electromechanical equipment.

Information electromechanical equipment refers to electronic mechanical products used for information collection, transmission and storage processing. For example, computers, printers, copiers, fax machines, communication equipment and other office automation equipment are all information electromechanical equipment.

Mechanical and electrical equipment for people's livelihood refers to electronic mechanical products used in the field of people's life. For example, all kinds of household appliances, household processing machinery, automotive electronic products, fitness machinery, etc. are all mechanical and electrical equipment for people's livelihood.

Lightning protection device: the combination of lightning receptor, down lead, grounding device, surge protector and other connecting conductors.

Lightning induction: Electrostatic induction and electromagnetic induction on nearby conductors during lightning discharge, which may cause electric sparks between metal parts.

Electromagnetic compatibility: The equipment or system has the ability to work normally in the electromagnetic environment and does not constitute an unbearable electromagnetic interference to anything in the environment.

Protective grounding: The exposed conductive part that is not charged when the electrical device is normal is connected to the protective line (PE line) or the protective neutral line (PEN line) according to the grounding type of the system, which is called protective grounding.

Surge protector: a device with nonlinear characteristics, used to limit the conduction of transient overvoltage in the line and cause surge current, and has nonlinear characteristics.