1. The selection of conductor type should be based on the installation method and environmental conditions. In addition to meeting these requirements, insulated conductors must also satisfy the voltage rating of the system they are part of.
2. When choosing the cross-sectional area of the conductor, the following criteria must be met:
1) The voltage drop along the line should be within acceptable limits for normal operation and the starting voltage of electrical equipment.
2) The current-carrying capacity of the conductor, determined by the installation method and surrounding environment, must be equal to or greater than the calculated load current.
3) The conductor must meet both dynamic and thermal stability requirements to ensure safe and reliable performance under fault conditions.
4) The minimum cross-sectional area of the conductor must comply with mechanical strength requirements. For fixed installations, the minimum core size should follow the guidelines in Table 2.2.2.
3. When installing insulated conductors and cables in areas with varying cooling conditions, if the length of the section with the worst cooling exceeds 5 meters, the conductor or cable size should be selected based on that specific section’s conditions. Alternatively, a larger-sized insulated conductor or cable can be used exclusively in that section.
4. The allowable current-carrying capacity of the conductor must be adjusted according to the ambient temperature at the installation location. A temperature correction factor can be applied using the following formula:
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