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.



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

What seems amazing to me is the tiny area that appears to be so hot. Although you can see the heat on the BØ, it looks like the heat dissipates pretty well, considering the extreme temp.

This was taken in a computer testing lab with plenty of Liebert A/C cooling the area. Probably helped the heat to dissipate. The lighter the blue color on "B" phase is the heat dissipating over the bus. Darker blue is a cooler temp.

The circuit fed a dedicated receptacle for computer equipment. The only problem was someone plugged six five foot plug strips into the dedicated circuit. "IT" guys just plug and play.

Or should it be "plug and pray?"

Doug, you are right. With "IT" guys it should be plug and pray. The above pic tells it all.