What does NC signify on a tag near the gas meter?

The designation "NC" on a tag near the gas meter signifies that there is no curb valve that exists at that location. This information is critical for firefighters and emergency responders as it indicates that there may not be a shut-off option readily available at the curb for that gas line. In situations where gas leaks or emergencies occur, knowing the existence or absence of a curb valve can greatly influence the approach taken by first responders to ensure safety and efficiency.

The terms associated with the other options would imply other meanings about the gas system. For example, a "new connection detected" would suggest the meter installation is recent, while "non-controlled valve" would imply there are valves that do not allow for manipulation in the conventional sense. "Not connected" would indicate a facility or property is without active gas service completely. However, in the context provided, "NC" specifically refers to the absence of a curb valve, making that the accurate interpretation.