Breaker and ambient temperature

A properly functioning "standard" breaker will not be significantly impacted by ambient temps and direct sunlight.

My father lived in AZ and the breaker box was outside the house (common in that area) on the west wall. Never any issues even at 120+ degrees air temp with added bonus of the sun beating directly on the box.

 

You seem to be fixated on ambient temperature being the source of the problem. The previous study that you linked showed a number of 30A breakers tripping at 32-36A at 120F. It also showed them tripping at 25A at 250F. You can keep digging until you find the answer you want. That is the beauty of the internet.

Have you measured the temperature in the breaker box? Stick a thermometer in there.

You’ve attached a photo of the box with the cover removed and a meter attached to a wire. It appears to be out of direct sunlight. It can’t be much warmer than the ambient air temperature and I doubt it is between 125-250F.

The wiring in that box is a disaster. It used to have a 20A breaker for a 30A outlet. Management probably pulled a 40 year old, 30A breaker from another pedestal to “upgrade” your pedestal and some poor bastage now has a 20A breaker for their 30A outlet.

Throw some shade on that pedestal. Lean a piece of plywood against it. Use a silver windshield screen. Put a potted plant next to it. And see if management will cough up a few bucks for a new, in the box, 30A breaker. That thing shouldn’t be popping at 24A.