For a separately derived system, what connection type should be avoided for grounding electrode conductor taps?

In the context of grounding electrode conductor taps, the Western Union style connection is considered less reliable due to its construction and the potential for corrosion over time. This type of connection involves twisting two wires together and securing them with solder or a similar material, which can present issues with long-term mechanical stability and electrical conductivity, especially in environments where movement or environmental factors may come into play.

When creating grounding systems, it is critical to ensure that connections are robust and maintain a low-resistance path to ground. Compression connections, twist-on wire connectors, and screw terminal connections generally provide better mechanical stability and conductivity, making them suitable choices for grounding applications. Therefore, avoiding Western Union style connections enhances the integrity and reliability of the grounding system for separately derived systems.