In an emergency system, the unit equipment must be on the same circuit as normal lighting in the area and connected ahead of local switches. Where should it be connected?

• A. ahead of
• B. after
• C. in parallel with
• D. downstream of

Answer: (A)

The main idea is that emergency unit equipment must be fed from the same branch that powers the area lighting and must not be controlled by the local lighting switches. Connecting the emergency unit ahead of those switches means it taps the supply before any wall or area switches, so it stays energized regardless of the position of the normal lighting controls. This arrangement guarantees the emergency lighting will operate during a power outage and won't be turned off simply by flipping a switch for the ordinary lights. If the unit were placed after the switches or downstream of them, turning off the local switch could cut power to the emergency unit, defeating its purpose.