Which is thicker a power cable or an optical fiber cable

Power cables are generally thicker than optical fiber cables due to their metal conductors and insulation requirements, while optical fiber cables are much thinner, often only slightly wider than a human hair.Power Cable ThicknessPower cables are designed to carry electrical current safely. Their thickness depends on two main factors: the size of the metal conductor and the insulation surrounding it. A thicker metal core allows more electrons to flow, increasing the cable's current-carrying capacity, while thicker insulation provides protection against overheating, interference, and physical damage . For example, standard household power cables or industrial 14-AWG to 4/0-AWG cables can range from a few millimeters to several centimeters in diameter depending on voltage and current requirements .Optical Fiber Cable ThicknessOptical fiber cables transmit data using light rather than electricity. The core of a fiber optic cable is extremely thin, typically about the width of a human hair (around 125 micrometers for the cladding and 8–62.5 micrometers for the core) and is coated with protective layers of polymer and buffer tubes . Even with multiple fibers bundled together and additional protective sheathing, the overall diameter of a typical fiber optic cable rarely exceeds a few millimeters, which is still much thinner than most power cables .Key DifferencesMaterial: Power cables use metal conductors (copper or aluminum), which require significant cross-sectional area to carry current safely. Optical fibers use glass or plastic, which transmit light efficiently in very small diameters .Function: Power cables carry high current, necessitating thicker cores and insulation. Optical fibers carry data signals with minimal energy, so they can remain extremely thin .Protective Layers: While both types have protective sheaths, the insulation in power cables is much thicker to prevent electrical hazards, whereas fiber optic sheaths mainly protect against physical damage and environmental factors .ConclusionIn almost all cases, power cables are significantly thicker than optical fiber cables. Even composite cables that combine fiber optics with small copper conductors for power (such as powered fiber solutions) are designed to keep the fiber portion thin while adding only minimal copper thickness for power delivery . This makes optical fiber cables ideal for high-speed data transmission in tight spaces, whereas power cables require more space due to safety and current-carrying needs.