🔍 Key Concepts

• Follow the AC power path feeding the battery charger symbol from the nearest labeled bus or switchboard • Interpret how the DC output from the charger is connected to the 24 VDC battery banks (look for individual switches/links versus a solid common connection) • Note the difference between main switchboard vs. emergency switchboard 120 VAC sections in the one‑line diagram

💭 Think About

• From which labeled 120 VAC section does the cable to the battery charger actually originate on the diagram? Trace it step‑by‑step. • Does the DC side of the charger show separate selectable connections to each bank, or a single output tied to both banks at the same time? What do the symbols (switches/contactors) indicate? • Why would the ship designer prefer the charger to remain powered during a blackout, and which board would still have power then?

✅ Before You Answer

• Confirm exactly which bus is labeled at the point where the battery charger is connected ("Main Swbd. 120 VAC Section" or "Emergency Swbd. 120 VAC Section"). • Verify whether there are switch symbols or changeover contacts between the charger output and each 24 VDC battery bank, implying one bank at a time, or a common bus tying both banks together. • Ensure your choice matches both the AC power source location and the DC charging capability; eliminate options that are only half‑correct.