Which grounding method is necessary for systems that operate over hazardous locations?

Solid grounding is the necessary grounding method for systems that operate over hazardous locations because it provides a direct path for fault currents to ground. This helps in effectively clearing any electrical faults that may pose danger, ensuring that equipment and personnel are safe from electrical hazards.

In hazardous locations, where flammable gases or dust may be present, it is crucial to minimize the risk of ignition caused by electrical faults. Solid grounding achieves this by quickly returning fault currents to ground, allowing protective devices, such as circuit breakers, to operate effectively and disconnect the supply in case of a fault. This immediate disconnection reduces the chances of fire or explosion due to electrical faults.

Additionally, solid grounding can help maintain system stability and improve the overall safety of the electrical equipment by reducing the voltage rise during ground faults, consequently protecting sensitive electronic devices in these environments.