True or False: Purged and pressurized systems require the installation of door-interlock switches for safety during maintenance.

The statement is true; purged and pressurized systems do require the installation of door-interlock switches for safety during maintenance. These systems are designed to prevent the entry of hazardous gases or vapors, and the door-interlock switches play a critical role in safeguarding maintenance personnel. When the pressure is applied to the system or when a purge process is active, the interlock ensures that the system cannot be opened or accessed while it is under pressure. This precaution helps to prevent any accidental release of hazardous materials, which could pose significant risks to those performing maintenance.

The requirement of door-interlock switches is part of a broader strategy to maintain a safe operating environment in hazardous locations. These systems often operate under strict safety codes and regulations, emphasizing the need for fail-safes to protect workers from potential dangers associated with explosive or toxic atmospheres. The concept of using interlock switches is standardized across various industries where hazardous conditions are involved, not limited to any specific industry or high-voltage scenarios, which is why other options are less accurate.