What material is high voltage wire

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3 general types of material:

Aluminum wire 

Aluminum-alloy steel wire

Steel core for strength, wrapped with aluminum for durability and cost

This design of stranded wire is called concentric round, since each strand is the identical, each is round, and cable is round
Wire size and material is a balance of cost and performance
For example, copper wire might be a better conductor for transmission and distribution...
... but copper wire is too expensive, and too soft for long spans between poles.

Aluminum wire is strong and relatively inexpensive, and it performs the job, so it is better choice than copper.

Resources:
3-phase electric
Household electric service
Why you need ground
Formulas-for-Ohms-law
Pulling elecric wire/ photos
power generation
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Resources:
Water heater formulas/ pdf
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Troubleshot household electricity
What is 3-phase
See inside household electricity
Basic home electricity
Figure volts amps watts
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