Instructions for Parallel Wiring of Distribution Boxes

Parallel wiring of distribution boxes should be done by connecting each branch individually to the main supply using appropriately rated terminals, avoiding jumpers, and ensuring terminal capacity is not exceeded. Key Principles for Safe Parallel Wiring1. Avoid Jumper Connections: Using jumpers to connect multiple circuit breakers from a single wire is unsafe and prohibited by national standards.

Jumpers can cause wires to carry the sum of currents from multiple circuits, leading to overheating and potential fire hazards. Instead, each branch should have a dedicated wire from the main switch to the circuit breaker, ensuring proper current protection and heat dissipation (SMICOPower). 2.

Check Terminal Capacity: Before inserting multiple wires into a terminal, verify the maximum number of parallel wires allowed. For example, some terminals support up to three 2. 5mm² wires.

Exceeding this limit can cause terminal heating and connection failure. If more wires are needed, use distribution boxes with extended terminals (ZCEBOX). 3.

Anti-

Loosening Measures: After connecting multiple wires in parallel, wrap 1–2 circles of insulating tape around the wire root (not the terminal) to prevent displacement when wires are pulled. This ensures a stable and reliable connection (ZCEBOX). 4.

Proper Wire Preparation and Crimping: Strip the insulation according to terminal requirements (typically 10–12mm). Insert the wire into the terminal and crimp securely using the appropriate tool. Tighten screws to the recommended torque (e.g., 1.

2–8. 0 N·m depending on the terminal type) to ensure a firm connection without damaging the wire (Solax Power). 5.

Parallel System Configuration for Inverters: When connecting multiple inverters in parallel: Designate a Master inverter; all others operate in slave mode. Connect communication cables (CAN or RS485) between inverters.

Connect A

C wires (R, S, T, N) to the corresponding EPS terminals, ensuring correct line sequence. Follow manufacturer instructions for parallel settings to avoid system faults (Solax Power). 6.

Wire Sizing and Load Considerations: Select wire sizes according to the loop current and the rated current of the circuit. For example, a 6mm² copper wire can carry up to 32A, while a 4mm² wire carries up to 25A. Ensure that each wire only carries the current of its respective branch to prevent overload (SMICOPower).

Recommended Installation Practices

Use single-bolt parallel groove connectors with heat shrink sleeves if multiple wires must converge. Maintain sufficient spacing between the main switch and branch breakers to allow wire routing. Cover connections with circuit breaker baffles to prevent accidental contact.

Always follow manufacturer installation guides for specific distribution boxes or inverter systems (Solax Power). By following these principles, parallel wiring of distribution boxes can be performed safely, ensuring reliable operation, compliance with standards, and reduced risk of overload or faults.