Bolt loosening in busbar joints is a reliability issue in both high- and low-voltage distribution. It raises contact resistance and can lead to local overheating.
The drivers called out by RHI are material behavior, thermal cycling, loss of preload, and vibration. The practical response is a joint designed for that duty, in copper or aluminum, rather than a generic bar.
Published on the RHI news station, 29 July 2026.