What is one requirement for additional feeder circuit wiring for emergency systems in assembly occupancies of 1000 persons or more?

For emergency systems in assembly occupancies with 1,000 persons or more, one of the primary requirements is that any additional feeder circuit wiring must be installed in a fully protected area by an automatic suppression system. This requirement is crucial because it helps ensure the reliability and integrity of the emergency power supply during a fire or other emergency situations.

When wiring is located in an area protected by an automatic suppression system, there is a reduced risk of damage from fire, which helps maintain the operational capability of emergency systems when they are most needed. This is particularly critical in large assembly occupancies, where the potential for high occupancy creates an increased demand for safety measures to ensure that emergency systems remain functional and effective.

The other options provided do not align with the requirements for emergency systems. Installing wiring outdoors or in an area without fire protection undermines the effectiveness of the emergency system. Similarly, requiring visibility from the exterior does not enhance the safety or operation of the system but could create unnecessary exposure to environmental factors. Thus, the requirement for installation in a fully protected area is vital for ensuring safety and operational efficiency in emergency situations.