We can use a straight-through cable to interconnect most of our modern ethernet switches because they support a feature called auto M D I X, which automatically and negotiates, pins that are to be used for transmitting and receiving on each switch port.

Neutral wires in an electrical system are designed to carry current back to the source in a balanced configuration. If 2 neutral wires were to touch, it could potentially create an unintended path for current, leading to a disruption in the balanced flow of electricity.

While it will work, it will be quite Power Supply dangerous. Neutral wires are current-carrying wires. If you do that the neutral could carry twice the current (or more if the circuits Diagram are different size) than the wire is capable of. This will cause overheating and could easily cause a fire or some other issue with the wiring.

Yes, it is common to use the earth or ground as a neutral in AC (alternating current) electrical systems. In some countries, the ground and wire are used as a safety measure to protect against Power Supply electrical faults and to provide a path for fault currents to return safely to the earth.

In 3-phase power systems, different color codes are used to distinguish between phases. Common color codes include Circuit Diagram black for phase A, red for phase B, and blue for phase C. These color codes facilitate proper installation and connection of 3-phase equipment and machinery.