The disconnecting means of an ESS shall be legibly marked in the field to indicate the following except for ___.

• A. Nominal output voltage
• B. Available output current
• C. Available fault current
• D. Calculation date

Answer: (B)

When labeling the disconnecting means for an ESS, the information marked in the field is meant to support safe operation and hazard analysis. The voltage level is essential because you need to know what you’re dealing with to select appropriate PPE, insulation, and clearance procedures. The available fault current is important for arc-flash protection and protective-device coordination, since it tells you how severe a fault could be at that point. The calculation date is included so that maintenance and protective calculations can be traced back to when they were performed, ensuring the current labeling reflects up-to-date analysis.

The available output current, while important for understanding the device’s capability, is not required to be marked on the field disconnect label. This current can vary with state of charge, operating conditions, and load, and is typically specified on the equipment’s data sheet or nameplate rather than mandated as a field marking.