@dalehileman,
The steel wire is just the "armouring" round the outside, Dale. Everything on the inside is conventional copper wiring.
This steel wiring is encased in a heavy duty waterproof coating and is designed to run underground, although you can run it above ground if you wish.
Apparently, you can hit that cable with a jackhammer and it will just bounce off.
From memory, it was quite expensive, but lasts for ever.