note that the "one side live all the time" is pretty much unique to the USA,
whose standard 220 is really based on a grounded center tap neutral - most
other countries have a 220 that has a neutral leg and the hot leg is 220
above it, and the neutral is nominally at ground. So, in some other
country - say the UK, a single pole switch on the hot lead would eliminate
any "live" voltage past the switch.


"Doug Miller" wrote in message
...
In article , "Bill Noble"
wrote:

actually, a single pole switch will work,

"Work" in the sense that it will stop the device from operating. But not
safely...

but one side will stay live all the time

.. for exactly that reason.

so a double pole single throw switch is preferred

If by "preferred" you mean "required for safe operation" then I will not
disagree with you.