Where should unit equipment (battery packs) be connected?

Unit equipment, such as battery packs, is typically designed to provide emergency lighting and should be connected to a dedicated emergency circuit. This ensures that when there is a power failure or other emergency, the battery packs can operate independently to provide illumination crucial for safety and egress. Connecting them to a dedicated emergency circuit ensures that they receive power from a backup source, such as a generator or battery backup system, when the main power supply fails.

While option B suggests connecting battery packs on the same branch circuit as normal lighting, this approach does not guarantee that the unit equipment will function during an emergency, since it could be affected by the same power interruption that takes out the regular lighting. This could lead to critical safety issues in emergency situations, which is why using a dedicated circuit is essential.

In summary, the correct approach is to connect unit equipment to a dedicated emergency circuit, ensuring reliable operation during power outages, ultimately serving the purpose of emergency lighting effectively.