Which statement best contrasts central battery systems with self-contained emergency lighting systems?

Which statement best contrasts central battery systems with self-contained emergency lighting systems?

• A. Central battery is suitable for large installations with high installation costs and maintenance; new lights can be directly connected
• B. Central battery is cheaper than self-contained
• C. Self-contained requires separate ventilated room
• D. New lights cannot be connected to central battery

Answer: (B)

The main idea here is how cost and maintenance scale when you choose a centralized battery system versus self-contained emergency lights. In a central battery setup, one or a few central batteries supply power to many emergency luminaires through a shared distribution system. In a self-contained setup, each luminaire carries its own battery and charging circuitry. For large installations, the centralized approach usually leads to lower life-cycle costs. You’re not paying for a battery and its charging electronics in every fixture; you consolidate energy storage, which reduces the total number of batteries that must be purchased, stocked, and serviced. Maintenance, testing, and replacements can be handled centrally, which simplifies logistics and tends to lower ongoing costs as the number of fixtures grows. That makes central batteries cheaper overall compared with installing many individual self-contained units. The other options either mix in less fundamental points or state inaccuracies. For example, while central battery infrastructure adds initial setup costs and space for a battery room, the overall life-cycle cost advantage in large installations is the core contrast this question targets. Self-contained units don’t inherently require a separate ventilated room, and new lights can be connected to a central system with proper design, so those statements aren’t the defining contrast.

The main idea here is how cost and maintenance scale when you choose a centralized battery system versus self-contained emergency lights. In a central battery setup, one or a few central batteries supply power to many emergency luminaires through a shared distribution system. In a self-contained setup, each luminaire carries its own battery and charging circuitry.

For large installations, the centralized approach usually leads to lower life-cycle costs. You’re not paying for a battery and its charging electronics in every fixture; you consolidate energy storage, which reduces the total number of batteries that must be purchased, stocked, and serviced. Maintenance, testing, and replacements can be handled centrally, which simplifies logistics and tends to lower ongoing costs as the number of fixtures grows. That makes central batteries cheaper overall compared with installing many individual self-contained units.

The other options either mix in less fundamental points or state inaccuracies. For example, while central battery infrastructure adds initial setup costs and space for a battery room, the overall life-cycle cost advantage in large installations is the core contrast this question targets. Self-contained units don’t inherently require a separate ventilated room, and new lights can be connected to a central system with proper design, so those statements aren’t the defining contrast.