Connection Hazards Caused By The Failure To Use Transition Terminals On Copper Terminal Blocks

In some power distribution system designs, copper terminal block directly participates in conductor connections. During the on-site inspection, it was found that when transition terminals were not used in copper distribution block, the difference in materials at the connection interface was a significant issue. Terminal blocks are electrical connection components used for fixing and distributing multiple conductors; improper connection structure treatment can affect connection stability.

Structural Problems of Copper Terminal Blocks Without Transition Terminals

The absence of transition terminals in copper terminal blocks means that conductors of different materials are in direct contact with the copper terminal block. Copper and aluminum differ significantly in electrochemical properties and conductivity. Under long-term operation, the contact interface is prone to oxide layer formation or changes in contact resistance. High temperature rise at connection points observed in some projects is often related to this structural form.

In a multi-circuit power distribution environment, the copper terminal strip terminal undertakes the conductor distribution function. When the connection method is not structurally converted using transition terminals, uneven pressure on the connection surface and insufficient contact area will gradually appear during long-term operation.

Operational Impacts of Copper Terminal Blocks Without Transition Terminals

When copper terminal blocks do not use transition terminals, the electrochemical reactions caused by differences in conductor materials may be exacerbated. When copper and aluminum are in direct contact, corrosion or increased contact resistance may occur at the interface. In copper-aluminum conductor connections, a dedicated transition terminal is typically used to complete the material transition and maintain a stable connection.

After long-term operation, uneven contact or interface oxidation at the copper terminal block connection points can easily lead to localized heating when current flows. For the internal wiring structure of distribution cabinets or control cabinets, this potential problem can gradually affect the stable operation of the circuit. Therefore, special treatment is usually applied to the copper terminal block connection structure during the design and installation phases.