GFCIs and their performance w/ and w/o EGCs

MechEdetour said:
Case 4 definitely stands out to me because it could potentially provide some good protection in the absence of an EGC.
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Yes thats why I find 406.4(D) inconstant with its GFCI requirement, it makes no difference if the receptacle a 2-prong or a 3-prong with no EGC connected.
MechEdetour said:
Case 9 is particularly interesting too because it seems as though the combination of having an EGC and not having a GFCI can lead to an even greater shock hazard (therefore adding more value to the addition of a GFCI - Case 10).
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Yes And the most common case of case 9 is docks, swimming pools and spa/hot tubs with missing GFCI/RCD or no-GFCI/RCD protection.
 
tortuga said:
Yes And the most common case of case 9 is docks, swimming pools and spa/hot tubs with missing GFCI/RCD or no-GFCI/RCD protection.
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In a pool or a spa/hot tube it should not be possible to touch the hot conductor. Docks are a different story because we run power out on the dock.
 
MechEdetour said:
. . . I said a GFCI does NOT need an EGC to operate.
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That is correct. A GFCI device does depend on the source being supplied from a grounded system to function.

In theory, a GFCI serves no purpose in a non-grounded system, as no substantial current would flow to earth.
 
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