On Mar 29, 10:14*pm, wrote:
Actually, transformer cores do "wear out".

Care to elaborate?

Mark

We've had transformers blow up around here. The last one was sort of
interesting. Half the lights went out and the other half stayed on --
it just dropped one leg. It lasted like that for about an hour.
Then ... BOOM ... and it all heck broke loose. It took off a tree
limb that was probably touching it, blew the wires off the pole,
shorted the line causing another transformer to fail. Then the relay
or fuse at the substation tripped and the lights went out in the
entire city.