Is the DW on its own cirucuit? Ideally it is. How old is the DW?
Turn off the circuit, remove the bottom kickplate, and check for
leaks, corrosion, loose wires, damaged wires, tight terminal
When I had my floors done a few years ago the guy doing the work told
me that while he was working the main (100A) breaker tripped. Even if
he pulled the cover off the breaker panel and tied his sander directly
to the bus this shouldn't have happened. He said it happened while he
was using his chopsaw...
I went down and checked it out. Turned out that one of the entrance
wires going to the main breaker was loose. A loose wire going to a
breaker, main or otherwise, would be the weak link and generate heat
cable of tripping the breaker.
If you don't have a disconnect or breaker between your 50A breaker and
your service those wires will be live all of the time.
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