Final answer:
The practice not recommended for institutionalizing the Incident Command System (ICS) is to use ICS to manage active incidents only. ICS should be integrated into both daily operations and emergency response to ensure familiarity and consistency.
Step-by-step explanation:
To answer the question regarding which practice is not recommended to institutionalize the Incident Command System (ICS), it's important to understand what ICS is. ICS is a standardized approach to the command, control, and coordination of emergency response. Looking at the options provided, the practice that is not recommended is to use ICS to manage active incidents only. In fact, ICS should be integrated into daily operations as well as during emergencies, for consistent application and to ensure personnel are accustomed to working within this system.
The other options listed are indeed recommended practices for ICS: ensuring communications interoperability and redundancy, ensuring that all personnel are trained properly, and identifying and typing all resources according to established standards. These are all crucial for an effective and efficient ICS.