Which type of connection is commonly associated with trouble calls?

The reason single-bolt connections are commonly associated with trouble calls is due to their design and structural integrity. Single-bolt connections, while simpler and faster to install, can sometimes lead to issues in terms of tension and load distribution. When a single bolt is used, there is only one point of attachment, which can result in movement or slippage under stress or vibration.

In contrast, double-bolt and triple-bolt connections provide more redundancy and stability, which makes them less likely to fail under operational conditions. Multiple-strand connections, while offering enhanced strength through additional engagement points, are typically used in more specialized applications where flexibility and strength are crucial. Thus, single-bolt connections can be more vulnerable to loosening or failure over time, making them a frequent source of trouble calls.