The difference being that with one, indirect contact (a fault to an exposed
metal case) would cause it to trip a soon as the fault occurred, but without
one it would need someone to touch it and start to receive a shock before it
But either with or without one, the latter would occur with direct contact
with live/ hot.
Yes you can safely use a 2-prong adapter, or an appliance with only a
2-prong cord. A GFI works by looking for a difference in the current between
the hot and neutral and has nothing to do with using a ground prong. Once
there is a difference of 6ma or more between the hot and neutral prongs the
GFI trips because it means that at least some of the current is coming out
of the hot prong but is not going back on the neutral prong. This means the
current is going somewhere else, such as to ground. Hence the name of a GFI
device, Ground Fault Interrupter, or GFCI, Ground Fault Circuit Interrupter.
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