Which two items must be included on the field marking for service equipment not in dwelling units?

• A. The available fault current and the date the fault current calculations were performed
• B. The serial number and model
• C. The load current and the voltage
• D. The manufacturer's name and date of installation

Answer: (A)

The essential idea is to provide the information electricians need to assess protection at the service: the maximum fault current that could be available at the service and when that calculation was last performed. Knowing the available fault current helps ensure the service equipment and overcurrent devices are rated to safely interrupt a fault, preventing equipment damage or hazards. The date of the calculations matters because if upstream wiring or sources change, the fault current can change too; having the date lets crews know whether the data is still valid or needs updating. Other details like serial numbers, model, normal load current, voltage, or installation date don’t directly inform the capability of the protection system and aren’t the required field-marking content in this context.