Insulation coordination determines the insulation properties of the device, taking into account the actual application and environmental conditions of the device. On the one hand, it relates to the characteristic values ​​of overvoltage and overvoltage protection devices related to electrical clearances, and on the other hand, it relates to the operating voltage, the direct surrounding environment which reduces the insulation properties of the device and the anti-pollution protection measures. Therefore, the size of the clearance is determined by the external or internal maximum overvoltage that may occur in the device. When using devices in different occasions or using overvoltage protection devices, the external overvoltages appear to be different. Therefore, the overvoltages are divided into different levels according to different occasions. In each overvoltage level, the corresponding pulse withstand voltage value is determined according to the magnitude of the rated voltage of the distribution network used. The minimum clearance is determined based on the environmental level of the pulse withstand voltage and the uniformity of the electric field. Signal products are applied to different railway lines, and the electric field and environmental pollution are different. The environmental applicability should be fully considered in the selection. In addition, the clearance correction factor should be considered for high altitude areas. The rated section of the wiring capacity terminal refers to the rated connection capacity of the terminal. The rated connection capacity of the combined terminal is the cross-sectional range of the wire to which the terminal can be connected. It must specify the number of wires that can be connected to multiple wires at the same time and the required end of the wire. Every pretreatment performed. Consider the cross-sectional range of the tubular bare end and the tubular pre-insulated end when connecting two wires that are rigid or flexible. The cross-sectional range of the two flexible wires can be connected when using a tubular bare end. The construction of the crimping frame terminal and the spring crimping terminal allows the copper conductor to be connected in principle without pretreatment. This eliminates the need for special handling of the wires and eliminates the need for tubular ends. If a tubular end is used to prevent the flexible wire from being bifurcated, the terminal accommodation capacity for the flexible wire is generally reduced by one level. The wire detection current values ​​for the different cross sections listed in the current load capacity table are determined by a standard. The corresponding current values ​​are indicated in the wiring data of the respective terminals.
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