What must the entire fire alarm system be when replacing old equipment?

The requirement for replacing old equipment in a fire alarm system is that the entire system must be upgraded to the latest standards. Fire alarm systems are governed by various codes and standards to ensure safety, reliability, and effectiveness in alerting occupants during a fire emergency. When any portion of a fire alarm system is replaced, it is typically necessary for the entire system to meet current building codes, standards, and regulations to ensure that it functions appropriately within the overall safety infrastructure of the building.

In contrast to the chosen answer, simply not bringing a system up to code could lead to significant safety hazards, liability issues, and potential violations of regulations. Upgrading to meet the latest standards ensures that the fire alarm system is not only compliant but also takes advantage of recent advancements and improvements in fire safety technology.