Using the applications of the theory of electrostatics into the engineering of cables. It is now time for you to look into what is out there in the market place.
Use the internet and any other means to your disposal to obtain hard data from at least two manufactures on the highest possible rating of cables.
This research should include cables for DC and both single- and three phase AC, for both underground and underwater.
Searches for information, such as what you are required to do in this project, will be a common occurrence in your professional life. Either because you (or your company) need a product for your own use or because you are intending to enter the market with your version of the product and want to know how competitive you would be.
include hard copies of the manufactures‘data sheets, cost of cables, and a commentary on your findings.