Stub connections are typically used in what scenario?

Stub connections are specifically designed for situations where there is insufficient room to make an in-line connection. This type of connection allows for a simpler installation process when space constraints prevent a full connection from being made. Stub connections effectively provide a way to tap into existing circuits in tighter areas, such as in conduit runs or within junction boxes with limited access.

In contrast, the other options describe scenarios that do not align with the intended use of stub connections. For instance, having sufficient space for connections would typically allow for traditional methods of connection, while high voltage requirements dictate using different techniques for safety reasons. Additionally, frequent disconnections would usually call for a more robust connection method that can withstand repeated use, rather than relying on a stub connection which is not designed for frequent engagement and disengagement. Thus, the specificity of stub connections to situations with space limitations is what makes this answer accurate.