Jeff Wisnia wrote:
I was talking about (internal fault) leakage to the safety ground lead
(chassis) oF an appliance with a three wire cord and plug. And, that
faulty appliance is plugged into a GFCI outlet which does not have a
ground wire run to it. i.e. an outlet which would require the little
label stuck on it warning that there was no safety ground there.

Take a look at Sam Goldwasser's diagrams and explain please how the GFCI
can sense internal leakage to the safety ground lead of the appliance if
the ground pin hole in the outlet isn't connected to anything.

The GFCI will not immediately sense if there is a leak to chassis
ground in a faulty appliance. However, the instant a person touches the
live chassis and completes a path to ground, the GFCI will trip,
preventing injury. A live chassis by itself isn't dangerous - only when
someone touches the chassis and gets shocked is it a problem, and a
GFCI outlet will protect against this.