On Tue, 12 Apr 2011 17:37:15 +1000, "Phil Allison"
wrote:



Got a ****ing clue how much current it takes to vaporise copper wires like
that ?

Obviously ****ing not.

How about "more than 15 amps"?

And it didn't blow the circuit breaker or fuse.
So the current came from somewhere other than the mains?
OK - the only other source is back emf from the motor -
Not saying it cannot be.
But why does the insulation on the transformer fail, and not the
insulation in the motor windings??
Most likely, if your scenario is correct, because there is something
wrong with the quality of the transformer windings.

And what is the solution????? Other than a transformer that can stand
up to real world abuse?
Find and repair the power connection problem that is causing the
back-emf problem before it causes other problems (like a fire from an
overheated power connection to a 1/2 HP motor)

NOT by putting a capacitor which may or may not have any effect across
the primary of the transformer. And MAY have the wrong effect.

Now, you need to locate the bad connection (if that is what it is)
Where do you start looking? It pretty well needs to be in the part of
the circuit that is always connected to both the motor and the
transformer - in other words upstream from wherever the transformer
and motor are connected (in common) to the mains, or else the back emf
would be "sunk" by the load on the mains, and the grid itself. - so
you are talking bad breaker, bad connection at the panel, bad shut-off
switch, or bad connections between the panel and the switch - not bad
relays, connections at the relays, or connections at or in the motor.

You would THINK there would be other symptoms - like the furnace
intermittently not running, noises, smoke, etc from the arcing
connection?

Again, not saying you are wrong - but you are not being very helpfull,
and you are sure being obstinate and dissagreeable

Facts are just like water off a duck's back to you - Don.

Cos ****wits like you believe whatever they ****ing feel like.


FOAD

- you useless, autistic, PITA turd.



.... Phil