1. The type of conductor should be selected according to the laying method and environmental conditions. In addition to meeting the above conditions, the insulated conductor should meet the requirements of the working voltage.
2. Select the conductor cross section and meet the following requirements:
1) Line voltage loss should meet the requirements of normal operation and starting voltage of power equipment
2) The current carrying capacity of the conductor determined according to the laying method and environmental conditions shall not be less than the calculated current.
3) The conductor should meet the requirements of dynamic stability and thermal stability.
4) The minimum cross-section of the conductor shall meet the requirements of mechanical strength. The minimum core cross-section of the fixedly laid conductor shall comply with the requirements of Table 2.2.2.
3. When laying insulated conductors and cables along different cooling conditions, when the length of the worst part of the cooling condition exceeds 5 m, the section of insulated conductor and cable should be selected according to the conditions of the section, or only the insulated conductor of large section should be used for the section. And cable.
4. The allowable current carrying capacity of the conductor should be corrected according to the ambient temperature at the laying point. The temperature correction factor can be calculated as follows.
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