Which URD component is fully rated for fault current?

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Fully rated for fault current means a component is designed and tested to carry the high energy of a short-circuit current without insulation damage, arc, or mechanical failure, so it can stay in the fault path until protective devices interrupt the circuit. The grounding elbow fits this requirement because it serves as a termination that must endure fault current as part of the equipment grounding path. It is manufactured to withstand the heat and forces of a fault while keeping a safe, low-impedance path to ground, which is essential for system safety.

The other items are not intended to carry fault current in the same way. A crossarm brace is a structural piece, not a current-carrying fault path. A molded underground splice is a connector for joining conductors but isn’t typically rated for fault-current conditions. A portable feed-through bushing is a termination through a wall or enclosure and isn’t designed to remain intact or safely conduct fault energy in a fault event.