Black conductor as Neutral:

Black conductor is used as a neutral wire in a 4 wire electric circuit. The neutral wire is the return path for the current flowing in the circuit and is connected to the ground at the electrical panel.

Explanation:
- Neutral Wire: The neutral wire carries current back to the electrical panel and is typically color-coded black in a 4 wire electric circuit.
- Function: The neutral wire completes the circuit and provides a path for the current to return safely to the electrical panel.
- Ground Connection: The neutral wire is connected to the ground at the electrical panel to prevent electric shocks and ensure safety.
- Different from Phase: The neutral wire is distinct from the phase wire, which carries current to the load, whereas the neutral wire carries current back from the load.

Importance of Neutral Wire:
- Safety: The neutral wire plays a crucial role in ensuring the safety of electrical circuits by providing a path for the current to return without any hazards.
- Functionality: Without the neutral wire, the circuit would not be complete, and the current would not flow effectively to power the electrical devices.
- Code Compliance: Following proper color-coding standards for electrical wires, such as using black for the neutral wire, ensures compliance with electrical codes and regulations.

In conclusion, the black conductor is used as the neutral wire in a 4 wire electric circuit to provide a safe and effective path for the current to return to the electrical panel. Understanding the role of the neutral wire is essential for the proper functioning and safety of electrical circuits.