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Questions about tubes and gear that glows. FAQ

Wrong ................

You Obviously don't understand the purpose of a GFCI. The GFCI does not know or care whether the Ground Fault was caused by an 'Accident' or whether the Ground Fault was designed into the circuit on purpose. It will Trip! Have you ever seen or used a Ground Fault Tester? - Pay attention to the N.E.C. -- Here is what they have to say about 2 Prong Installations:
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Replacing Receptacles to Meet the NEC

The NEC requires receptacles installed on 15 and 20 ampere branch circuits to be of the grounding-type and it requires the grounding contacts of those receptacles to be effectively grounded to the branch circuit equipment grounding conductor [210-7]. However, the Code allows the installation of any of the following installations when replacing a 2-wire nongrounding-type receptacle where no ground exists in the outlet box [210-7(d)(3)], Figure 9/10:
(a) Replace the 2-wire receptacle with another 2-wire receptacle.
(b) Replace the 2-wire receptacle with a GFCI-type receptacle and marked the receptacle with the words "No Equipment Ground."
(c) Replace the 2-wire receptacle with a grounding-type receptacle where protected by a GFCI protection device (circuit breaker or receptacle). Since the grounding terminals for the receptacles are not grounded, the receptacles must be marked with the words "GFCI Protected" and "No Equipment Ground."
A grounding-type receptacle that is GFCI protected without an equipment grounding conductor is a safer installation than a grounding-type receptacle with an equipment grounding conductor (if GFCI protection is not provided). This is because the GFCI protection device will clear a ground-fault when the fault-current is 5 milliamperes (+ or - 1 milliampere), which is less than the current level necessary to cause serious electric shock or electrocution.



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