Which type of connection should not be solely relied upon for isolator wiring?

Solder connections are often considered good practice for providing continuity in electrical circuits; however, they should not be solely relied upon for isolator wiring due to several factors. While soldered joints create a strong electrical connection, they can become brittle, especially if subjected to vibration or flexing that is common in marine environments. This brittleness can lead to cracks and ultimately failure of the connection.

Moreover, soldering does not provide mechanical strength on its own; it can fail under physical stress. It also can be prone to corrosion, particularly in marine applications where moisture is a factor, potentially compromising the integrity over time.

In contrast, other connection types might offer additional mechanical stability or flexibility, which is crucial in marine systems that experience movement and vibrations. Therefore, it is essential to combine solder connections with other connection types or methods to ensure reliability and durability in isolator wiring.