Using network cables to make a power distribution box

Ethernet cables can carry low-voltage DC power for small devices, but they are not suitable for high-current AC power distribution without careful design and safety measures.Feasibility and LimitationsEthernet cables, such as Cat 5 or Cat 6, consist of four twisted pairs of 24–26 AWG wires, which are designed for data transmission rather than high-current power delivery . While they can carry low-voltage DC power, the current capacity is limited—typically around 0.5–1 amp per wire depending on cable quality and length. Using them for higher currents can cause overheating, voltage drop, and fire hazards .Practical ApproachesLow-Voltage DC Distribution: You can use a central power supply (e.g., 24V DC) and run Ethernet cables to each device, then use step-down converters at each endpoint to provide 3V, 5V, or 12V as needed . This approach is suitable for LED lighting, sensors, or small electronics.Wire Pairing: To increase current capacity, multiple pairs can be combined—e.g., 6 wires for positive and 2 for ground—but the total current must remain within safe limits for the cable .Power over Ethernet (PoE): A safer and standardized method is PoE, which allows Ethernet cables to carry both data and power simultaneously. PoE can deliver up to 60W per cable at 48V DC using specialized injectors and splitters, avoiding the risk of short circuits if someone plugs in a standard Ethernet device .Safety ConsiderationsAvoid AC mains: Ethernet cables are not rated for 120V or 230V AC; using them for household or industrial AC power is extremely dangerous.Fusing: Each cable or wire pair should have a fuse at the power source to prevent overloads .Labeling and connectors: Clearly mark cables carrying power to prevent accidental connection to Ethernet devices.Compliance: Check local building codes for low-voltage wiring requirements if installing permanently .Alternative: Traditional Power Distribution BoxFor higher-current AC applications, a custom power distribution box with proper breakers, heavy-gauge wires, and protective enclosures is recommended . This ensures safe, reliable power delivery for tools, lighting, or temporary setups, which Ethernet cables cannot safely handle.ConclusionUsing network cables for a power distribution box is only practical for low-voltage DC applications or PoE setups. For standard AC power or high-current devices, a conventional distribution box with appropriate wiring and protection is necessary to ensure safety and compliance.