Copper line backer question?

I've never seen exposed copper wire come out of a breaker box like

Dig for Gold with Copper by Capt. Scott Kuvshinikov – Great Lakes

Duravit Wave Tall Single Lever Basin Mixer Tap

Venice Copper Basket Strainer Kitchen Sink Waste

How to use Copper and Leadcore Line while Salmon Fishing

Vikings put linebacker Casey Matthews on season-ending IR – Twin

Gophers gain transfer commitment of Jaxon Howard, top-rated

Bower Brushed Copper Dual Lever Kitchen Mixer Tap

A Copper Mine Could Advance Green Energy but Scar Sacred Land

Copper Wires: Your Top Questions Answered

Linebacker Shae Suiaunoa to Return for Final Season at Wyoming

water - Is this pipe corrosion a problem? - Home Improvement Stack

Vikings' Mike Zimmer: Anthony Barr has 'tendency to coast

Big Ds part of Ware's HOF celebration