Which suffix designates two insulated conductors laid parallel in a cable?

The suffix that designates two insulated conductors laid parallel in a cable is "D." This designation is important as it indicates a specific construction type that is commonly used in electrical installations. When there are two insulated conductors arranged in this manner, it typically implies that they are intended to be used together for a particular application, such as in power distribution or signal transmission.

This arrangement can help simplify installations and improve efficiency, as having the conductors laid parallel can reduce electromagnetic interference and maintain consistent electrical characteristics over the length of the cable. Understanding these designations helps professionals select the correct cables for their projects and ensures compliance with relevant codes and standards.