How to connect distribution boxes in parallel

Connecting parallel distribution boxes requires careful alignment of line sequences, proper terminal connections, and adherence to master-slave configurations for safe and efficient operation.Key Steps for Parallel Connection1. Safety First Always ensure the main power is turned off before starting any wiring. Use insulated tools and verify that all cables are de-energized to prevent electrical shock or short circuits . 2. Prepare the WiresStrip insulation from cable ends according to the terminal requirements (typically 10–18mm depending on the port), .Use proper crimping tools to attach terminals securely. Loose connections can cause system failure or overheating . 3. Connect AC TerminalsMatch the line sequence correctly: R-R, S-S, T-T, N-N, G-G.Insert the stripped wires into the corresponding EPS or load ports and tighten screws to the recommended torque (e.g., 4.0 N·m), .Ensure neutral bar connections comply with local standards, as they may differ by country . 4. Master-Slave Configuration (for hybrid systems)Identify one inverter as the Master; all others will automatically enter Slave mode .Connect the CAN communication ports: left port of Master to the first parallel box, right port to the Slave.Set the resistance switch to "ON" on the Master and the last Slave to synchronize the system .If an inverter needs to exit the parallel system, disconnect CAN and power cables, then set it to "Free" mode via the LCD settings . 5. Avoid Unsafe Jumper ConnectionsDo not use jumper wires to connect multiple circuit breakers in parallel, as this can overload wires and violate safety standards .Each branch should have a dedicated connection from the main terminal to prevent excessive current on a single wire . 6. Final ChecksVerify all connections with a multimeter to ensure continuity and correct voltage distribution .Label each circuit clearly for future maintenance and troubleshooting .Dress and secure wires neatly inside the enclosure, leaving space for heat dissipation . 7. Power On and TestOnce all connections are verified, restore power and monitor the system for proper operation.Check for any abnormal heating, voltage drops, or error indicators on inverters or breakers . By following these steps, parallel distribution boxes can be connected safely and efficiently, ensuring reliable power distribution and compliance with electrical standards.