"KTECH" wrote in message
...
Thought some of you might add to this/
Came home from work 5:30 PM Monday,no power.
Found 100 amp breaker tripped re-set all OK
Same thing Tues.
Same thing Wed. after checking lines etc and again taking whole house
amps (Max38w/ air on and fridge on.
On way back up I was resetting clocks when I noticed they all stopped at
the same time.After checking my setback thermostat sure as hell main
tripped at program change.Went to held temp. problem solved. Still a
little miffed that 30 amp air breaker held and 100 amp opened.
Frank


It will happen. I assume the 30 amp was for your AC condensing unit?

At a office building we had a 1000 amp, (yes one thousand!), main breaker
trip instead of a 40 amp for a AC unit. The compressor was shorted to
ground. The 40 was a time delay breaker of some sort, and the main was not.
Both breakers saw the short to ground, but the main was designed to trip
faster, so it did.
Greg