What characteristic is essential for non-metallic sheathed cables used in flexible conduits?

Non-metallic sheathed cables, often referred to as NM cables, are commonly used in residential and light commercial applications. One essential characteristic for these cables, especially when used inside flexible conduits, is low moisture absorption. This characteristic ensures that the integrity of the cable is maintained over time, as excessive moisture can lead to insulation degradation, reduced conductivity, and potential electrical hazards. Flexible conduits are often used in environments where cables may be exposed to varying levels of humidity, and having low moisture absorption helps to prevent issues that could arise from water ingress.

While high temperature resistance, electrical conductivity, and structural rigidity are important properties in various contexts, they do not specifically address the vulnerabilities that non-metallic sheathed cables face in relation to moisture exposure when installed within flexible conduits. Low moisture absorption is critical in maintaining the safety and longevity of the cable, making it the essential characteristic in this scenario.