Burned out 2 5V regulators on Power Distribution boards

[jskene]

We have burned out 2 5-volt regulators on different Power Distribution Boards. Has anyone else had this problem?

The only thing the 5-volt connector was powering was our camera. We double checked our wiring and it was correct. The camera is electrically insulated from the frame, as required by rule R41.

The specifications on this regulator indicate that it has a 3 amp capability and it that it has over-current protection. In spite of this, on two separate boards we experienced a strong burning smell, followed by a loss of our 5-volt supply.

In the interim we wired up a simple 7805 5-volt regulator, connected to an unused 12 volt circuit breaker, and this works just fine, except that it contradicts rule R43.