In a 3-line cable supplying energy to equipment, which line should not be used if only two lines are fused?

In a 3-line cable system, typically consisting of two hot lines and a neutral line, the neutral line plays a critical role in balancing the electrical load and providing a return path for current. If only two lines are fused, it is crucial to avoid using the neutral line for the following reasons:

The neutral line is designed to carry current back to the source and complete the electrical circuit. Fusing the hot lines while leaving the neutral unfused can create an imbalance in the electrical system. If the neutral is used without proper protection, it could become overloaded, resulting in a potential safety hazard such as overheating, which could lead to electrical fires or equipment damage.

By not using the neutral line when only two lines are fused, you help maintain operational safety while ensuring that the circuit remains balanced. This prevents overloading and mitigates the risk of equipment failure or electrical hazards.

In contrast, the hot lines are the live wires that carry the current, and if they are fused together, it is typically assumed that some mechanism or alternative path (like the neutral or ground) can safely carry the return current without risk. The ground line is primarily for safety and fault protection and does not participate in regular current flow as the other lines do. The secondary line could