An electrical system with a fuse on the neutral conductor and on the energized (hot) conductors is considered to be:

An electrical system that has a fuse on the neutral conductor, in addition to fuses on the energized (hot) conductors, is indeed considered hazardous and should be corrected. The primary reason for this is that fusing both conductors can create an unsafe condition during a fault or overload situation.

In a properly designed electrical system, only the energized (hot) conductors are fused, allowing a circuit to be interrupted when an overcurrent situation occurs. If the neutral conductor is also fused, it can lead to situations where the neutral path is interrupted while the hot conductor remains live. This could create a shock hazard, as equipment and circuits that depend on the neutral might still be energized, presenting an increased risk to users.

The other options contain statements that do not accurately reflect safe electrical practices. For example, the idea that such a system is "twice as safe" misunderstands electrical safety norms; having a fuse on the neutral does not enhance safety but rather compromises it. Similarly, the notion of it being “overfused” or that the neutral fuse should be sized differently distracts from the central safety concern: the presence of a fuse on the neutral itself is inappropriate for safe electrical systems. Thus, it is critical to ensure that such