Keep in mind, we as residential, commercial and industrial electricians rarely ever work on "High Voltage". I never have in 35 years.
Anything below 600 volts is considered low voltage. Then we go to medium voltage after 600 volts. I am not sure where high voltage starts. I assume its over 4160. Just FYI.
If you are in the trade you should come to the professional forum. You are welcomed and invited.
Your rite. And I am in the trade. And I will come to the forum. Thank u