On Friday, December 6, 2019 at 2:19:36 AM UTC+11, Tricky Dicky wrote:
Can attest to screw connections working loose over time. I recently posted about a junction box I had installed on a floor joist about 5years ago only to find when I added a spur to it I found the screws gripping OK but definitely not tightened to my usual torque of one grunt + 1. At the moment it is easily accessible as the floor is carpeted but SWAMBO is talking about replacing the covering with Amtico or Karndean so will probably replace it with a Wago box before that.

Richard

Screw connections tend to loosen over temperature cycles, vibration in the frame ie.,a large "thud" of a tree felling, roadside rammer or even a mild land tremour. It would be a good practice to open and clear dust and use hot air from blower across terminals,AND, tighten them all once periodically, typically when we change smoke-alarm batteries