In article ,
Jim Michaels wrote:
In US IIUC it would be called 240v, but in fact be 120-0-120, so the
voltage from earth is 120 ac, not 240. In which case the fault
clearance benefit of genuinely 240v would sometimes apply and sometimes
not. Some faults that smoulder at 120 can arc over and trip at 240.

And some that would not cause a fire at 120V will burst into flames at
240V.

Not so - it's the current that causes a fire. If low voltage was safer
from the fire point of view, cars would never suffer electrical fires.

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*Many people quit looking for work when they find a job *

Dave Plowman London SW
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