IBEW Apprenticeship 1st Year Practice Test 2026 – Full Exam Prep

The correct choice, IWRC (Independent Wire Rope Core), is recognized for providing significantly higher strength compared to a fiber core. An IWRC consists of a core made up entirely of wires, which are typically constructed from the same materials as the outer strands of the rope. This design enhances the overall strength and load-carrying capacity of the wire rope, making it particularly suitable for demanding applications where high strength and durability are essential.

In contrast, a fiber core is designed primarily to add flexibility and cushioning within the wire rope but does not contribute nearly as much to the strength of the assembly. While fiber cores may offer benefits in terms of weight and flexibility, they do not match the performance of IWRC in heavy-duty applications.

This clear distinction makes IWRC the preferred option when high tensile strength is required, which is why it is often chosen for lifting and rigging applications. The strength of the wire rope as a whole depends significantly on the core type, making IWRC a critical component for ensuring safety and reliability in rigorous working conditions.