Code requirements state that the disconnecting means for a circuit providing power to a pump for an LP-Gas filling station must include which of the following?

The correct answer emphasizes that the disconnecting means for a circuit supplying power to a pump at an LP-Gas filling station must also disconnect the grounded conductor. This requirement is rooted in ensuring safety and compliance with electrical codes, such as the National Electrical Code (NEC), which aim to mitigate risks associated with flammable gases and electrical faults.

By ensuring that the disconnecting means includes the grounded conductor, it prevents potential hazards that could arise if only the ungrounded conductors were disconnected. If the grounded conductor remains connected while the ungrounded conductors are de-energized, there is an increased risk of electric shock or equipment malfunction when maintenance is being performed or during a power outage. Disconnecting all conductors, including the grounded one, minimizes these risks, providing a safer environment for both workers and equipment during servicing and maintenance activities at the filling station.

In this context, it is crucial for the safety of personnel and compliance with electrical safety standards to ensure that the entire circuit, including the grounded conductor, can be isolated when necessary.