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The photo shows coils of bare copper strip (copper tape/flat copper conductor).
These are commonly used in electrical and industrial applications such as:
Earthing (grounding) systems – to connect equipment and structures safely to earth.
Electrical busbars – distributing high current in switchboards, transformers, and control panels.
Lightning protection systems – carrying lightning current safely to the ground.
Transformer and motor winding – some transformers and large electrical machines use flat copper strip instead of round wire.
Electrical bonding – connecting metal parts together to maintain the same electrical potential.