Why is it necessary to monitor isolation resistance in fuel cell electric vehicles?
To prevent potential electric shock to users and maintenance personnel
A fuel cell electric vehicle carries a high-voltage traction system, and its live parts must stay electrically isolated from the metal body and chassis that people can touch.
Isolation resistance is the measure of how well the high-voltage circuit is separated from the vehicle frame; a high value means only a tiny leakage current could reach the metal.
If the insulation deteriorates, this resistance falls and the chassis can rise to a dangerous potential.
Continuous monitoring detects that insulation breakdown early and warns the driver or technician before contact becomes hazardous.
The whole reason is therefore personal safety: to prevent potential electric shock to users and maintenance personnel.
Acceleration, driving range and emission levels are governed by the motor, energy storage and the fuel cell reaction, not by isolation resistance, so those options do not explain the monitoring.
Hence, the answer is To prevent potential electric shock to users and maintenance personnel.
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