What must service disconnecting means be labeled with according to Article 230?

According to Article 230 of the National Electrical Code (NEC), service disconnecting means must be labeled with the nominal voltage and maximum available fault current. This requirement helps ensure that anyone who works on or near the electrical service has vital information about the potential electrical characteristics that they might encounter.

Labeling with the nominal voltage informs personnel of the operating voltage of the system, crucial for understanding how the system is to be safely handled. The maximum available fault current provides critical information regarding the potential short-circuit conditions that could arise, allowing for the implementation of appropriate safety measures and ensuring that protective devices are suitable for interrupting possible fault conditions.

This labeling practice primarily focuses on safety and operational efficiency, and these specific pieces of information are essential for emergency responders, maintenance personnel, and electrical contractors who may need to service the equipment. The other options mentioned, such as the type of load served, the date of installation, and the maximum current carrying capacity, do not have the same safety implications as understanding the voltage and fault current capabilities in relation to service disconnects.