Service equipment in non-dwelling units must be field-marked with which information besides the available fault current?

• A. The date the fault current calculations were performed
• B. The serial number of the equipment
• C. The voltage rating
• D. The manufacturer's name

Answer: (A)

When marking service equipment in non-dwelling units, you must include the date the fault current calculations were performed, in addition to the available fault current. The date provides a record of when the calculations were last done, so anyone working on or inspecting the system knows whether the protective device settings still reflect the current setup. If wiring, equipment, or service components change, fault current can rise or fall, making it essential to re-calculate and update the mark. This helps ensure proper coordination of overcurrent protection and maintains safety for future modifications.

Serial numbers, voltage ratings, and manufacturer names are typically found on the equipment label itself or aren’t required as part of this specific field marking. The crucial dynamic element is the calculation date, which signals whether the data backing the protection settings remains valid.