1. The problem statement, all variables and given/known data How does the method of cable installation and other external factors influence the required cable cross sectional area for a given circuit 2. Relevant equations 3. The attempt at a solution I've been searching for the answer for this for ages. I only find answer relating to types of TYPES of cable installation to use or TYPES of installation methods to use depending on external factors. I can't find anything that talks about cable sizing and what factors influence it, can someone help me out?