The correct conductor size is determined by analyzing the thermal and fault-level data collected in Section 4.1. Specifically, the Maximum Rated Current (item 5) and Short-Circuit Currents (item 6) are critical inputs for ensuring adequate thermal performance, mechanical integrity, and electrical stability. The choice must be guided by a comprehensive analysis of the three primary factors outlined in Clause 5 of the standard.

1. Thermal Performance: The conductor must be sized to safely handle the maximum temperature that will occur during continuous, cyclic, emergency, and short-circuit conditions. The calculation of current ratings should be performed in accordance with established standards, such as IEC Publication 287.
2. Mechanical Loads: The conductor must be robust enough to withstand all mechanical stresses imposed upon it, both during the installation process (e.g., pulling tension) and throughout its service life.
3. Electrical Stress: The physical diameter of the conductor influences the electrical stress within the surrounding insulation. A conductor with a small cross-sectional area may result in unacceptably high electric stress in the insulation material, potentially leading to premature degradation.

Once the conductor is specified, the final component required for a complete system specification is the cable terminations.