Today I saw a 10 kilovolt cable being dug under ground and I have detailed questions.
For example, I saw the cable mark and googled it and found that the cable features a copper wires shielding - I'd like to know what's the reason to have copper wires shielding in a 10 KV power cable.
Also I saw that the cable was only one wire, so it takes three such cables running together to have a 3-phase power line - three cables will not be extremely parallel, they will follow slightly different paths and so will have slightly different lengths and slightly different resistance. I'd like to know is these cables having slightly different resistance have any impact on power transmission.
Are such questions okay on this site?