When dealing with parallel conductors, which of the following criteria must they meet?

In electrical installations involving parallel conductors, it is essential that they have the same insulation type and material. This criterion is crucial because variations in insulation can lead to differences in thermal properties and dielectric strength, potentially resulting in unequal current distribution among the conductors. If the insulation types differ, one conductor may overheat while others operate normally, creating a risk of failure or fire hazards.

While options regarding voltage rating and other factors are important in different contexts, ensuring that parallel conductors share the same insulation characteristics is fundamental to maintaining safety and compliance with electrical codes. Uniform insulation helps ensure that the conductors operate synergistically without one compromising the integrity of another.