What are the requirements for wire colors in electrical installations?

The requirements for wire colors in electrical installations are based on safety and standardization to ensure consistent identification of electrical conductors. The correct answer specifies that black and red wires are commonly used for live (or "hot") conductors, while white wires are designated for neutral conductors, and green or bare wires are reserved for grounding.

Using black and red for live wires allows electricians and inspectors to easily identify these conductors, which carry voltage and pose shock hazards. The white wire, designated for neutral, provides a return path for current and is crucial in completing the electrical circuit. Green or bare wires are essential for grounding, ensuring safety by providing a path for fault current, which protects equipment and personnel from electrical shocks.

The other answer choices do not adhere to these established conventions. For instance, the mention of red for ground or the use of different colors for live and neutral does not align with standard practices, potentially leading to confusion and safety hazards in electrical systems. Hence, the established conventions in choice C provide clarity and ensure safety in electrical installations.