What is the requirement for conductors run in parallel regarding their physical characteristics?

The correct answer is that conductors run in parallel must have the same physical characteristics. This requirement is crucial because when conductors are installed in parallel, they are expected to carry equal load current under normal operating conditions. If they have different characteristics, such as size, material, or insulation type, they may not distribute current evenly, leading to overheating or failure of one of the conductors.

Uniform characteristics ensure consistency in electrical performance, reduce risks of imbalance, and enhance overall system reliability. This standard is rooted in electrical code regulations, which emphasize safety and efficiency in electrical installations. By ensuring that parallel conductors share the same specifications, the installation complies with industry practices that prioritize the safe and effective distribution of electrical energy.