Voltage On Ground Wire 12v

What is the ground (earth) wire for? Ground wire current fault touching appliance hot earth electrical conductor electric wiring grounded voltage path low touch body not systems Is it normal to have voltage in ground wire? if i unplug those 2 cables

12-volt DC Wiring Standards | It Still Works

Plugged 110v cables 12v 12-volt dc wiring standards

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Is it normal to have voltage in ground wire? If I unplug those 2 cables

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12-volt DC Wiring Standards | It Still Works

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What Is the Ground (Earth) Wire For? - Dengarden