Which safety features should all LP-Gas systems have?

The correct choice highlights essential safety features that are critical in LP-Gas systems to ensure safe operation and prevent hazardous situations. Pressure regulators are essential for maintaining the correct gas pressure in the system, which helps prevent leaks and explosions. Safety relief valves are designed to release excess pressure automatically, protecting the system from overpressure scenarios that could lead to catastrophic failures. Shutoff switches add an additional layer of safety by allowing for quick disconnection of the gas supply in the event of an emergency or malfunction, which is crucial for preventing accidents.

The other options include useful components, but they do not encompass the fundamental safety features that are typically mandated for LP-Gas systems. For example, while thermal sensors and gas detectors are valuable for detecting leaks and excessive heat, they are not as critical in every installation as the components listed in the correct answer. Automatic ignition systems and dampers, while useful in specialized applications, are not universal requirements for all LP-Gas systems. Emergency lights and alarms contribute to safety during a crisis but do not directly control gas flow or pressure like regulators, relief valves, and shutoff switches do. Therefore, the components listed in the correct choice are foundational for maintaining the safety and integrity of LP-Gas systems.