When grounding electrode conductor taps are used, which connection method is not permitted?

The method of connection that is not permitted when using grounding electrode conductor taps is the Western union style connection. This connection type involves wrapping wires together and securing them with solder or other means, which can create a physically unstable or unreliable joint. Grounding systems are critical for safety and electrical stability, so connections must ensure a low-resistance pathway.

The other methods of connection, such as crimp connections, screw terminal connections, and solder connections, are considered acceptable because they provide a more secure and reliable bond. Crimp connections typically involve compressing a metal connector onto the wires to ensure good contact without the risk of loosening over time. Screw terminal connections allow for easy assembly and maintenance, ensuring tight, stable joints. Solder connections, when done properly, can create strong electrical joints. However, they must be executed with care to ensure they meet safety standards.

Thus, the Western union style connection is not recommended, as it can compromise the effectiveness and safety of the grounding system.