bending resistance

Festoon cables (also called curtain cables or loop cables) are specialized power distribution cables designed for overhead, suspended installations where the cable hangs in loops from fixed support points while a moving trolley or crane pulls the cable along beneath it. The term “festoon” derives from the architectural practice of hanging decorative swags between fixed points—a metaphor that accurately describes how these cables are installed in crane systems. FC-PNCT festoon cables serve as the primary power supply for overhead equipment including container cranes, gantry cranes, overhead bridge cranes, and related port equipment. The cable hangs in a series of gentle loops from fixed hanger points spaced approximately 5–10 meters apart. As the crane moves along the runway, the moving trolley pulls the cable along with it, creating a smooth, coordinated motion that maintains electrical contact between fixed shore power and the moving equipment. Festoon cables experience fundamentally different stresses compared to reel-mounted high-tension cables: • Repetitive bending cycles as the cable forms and reforms loops—but at a slower rate than reel cables • Lower tensile stress because the cable hangs relatively stationary between support points • Environmental exposure to saltwater spray, UV radiation, and thermal cycling—same as reel cables • Gentle, predictable bending geometry with consistent bend radii determined by hanger spacing • Lower operational temperature due to reduced mechanical stress and typically lower current demands These differences necessitate a distinctly different cable design optimized specifically for festoon applications. Festoon cables prioritize superior bending flexibility, excellent environmental resistance, and long-term durability under repetitive but gentle mechanical stress.