The two ends of a small busbar should be connected to the main power source or the designated feeder terminals in the electrical panel, ensuring secure mechanical and electrical contact.

Placement and Connection

The small busbar on top of the cabinet typically serves as a distribution point for incoming or outgoing power. Its ends should be connected to:

• Incoming feeder or main breaker terminals: This allows the busbar to receive power from the main supply and distribute it to the circuits below ( ).
• Adjacent busbars or distribution points: In some panels, busbars are joined to other busbars to extend the distribution network. Connections can be made using bolted joints, clamps, or welding depending on the design and current rating ( ).

Connection Methods

• Bolted Joints: Overlap the busbar ends and secure with bolts and washers to ensure mechanical strength and low electrical resistance ( ).
• Clamps or Compression Connectors: Apply pressure to maintain a reliable connection, suitable for high-current applications ( ).
• Welding: Provides a continuous conduction path but is more challenging to perform on-site ( ).

Safety Considerations

• Turn off the main power before making any connections ( ).
• Use proper torque specifications for bolts to avoid loose connections or overheating ( ).
• Maintain clearance from live components and use insulating covers if required to prevent accidental contact ( ).

Summary

To connect the two ends of the small busbar safely and effectively:

1. Identify the main power source or feeder terminals in the panel.
2. Choose an appropriate connection method (bolts, clamps, or welding).
3. Ensure secure mechanical and electrical contact.
4. Follow safety protocols, including power shutdown and insulation. This ensures the busbar distributes power efficiently while minimizing electrical resistance and maintaining safety.