Yes a ground wire can cause a spark and cause fire
The ground wire leads from the negative side of the battery and connects either to the engine block or to the frame of the automobile.
This must be a prank question because the service panel ground wire is a bare wire. There is nothing to catch fire as there is no insulation covering the wire. If not a prank question please give more detail as to what is happening.
If the exposed wire grounds out and a great amount of heat is produced then yes a fire could start under this condition. Remember overhead transmission wires are exposed wires but are well insulated from ground so as not to have the above scenario happen.
Most all vehicles these days are negative ground so, if you touch a positive wire/terminal or cable to ground you can cause damage and possibly start a fire.
Electricity seeks the fastest path to the ground. If a live wire happens to touch the ground most often the line will "ground out" and cause the electricity to flow into the ground. This can cause breaks and circuits to break and cause other electrical malfunctions.
To prevent electrical charges generated by lighting from entering the home which can cause fire and damage components.
If the ground wire is not connected in an electrical circuit, there is an increased risk of electric shock or fire because the ground wire helps to safely redirect excess electricity away from the circuit.
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A corroded ground wire will cause a fuse to blow. Until the ground wire is cleaned the problem will persist.
Your entire automobile electrical system is grounded to the frame of the vehicle. A loose or corroded ground wire can cause the dash lights to Flickr and the car to stall out.
Yes, rodent damage to Romex can cause a ground fault circuit interrupter (GFCI) to trip. Rodent chewing on the wiring can expose the copper inside, leading to a ground fault. When the exposed wire contacts a grounded surface or another wire, the GFCI will trip to prevent electric shock or fire hazard.