This is a Thermal Image of a Siemens bolt on panel from Capt. Al. The screw holding a single pole 20 amp breaker to the bus was loose.

[Linked Image]

The 409 C number is the temperature at the cross hairs.

Now this panel needs replacment, the copper bus for phase "B" is now gray.

Bob

Bob Badger
Construction & Maintenance Electrician
Massachusetts