Originally Posted By: roconnor
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Guys … GFCI outlets (2-wire or 3-wire) provides people protection. Grounding provides casing fault, equipment and wire protection.
a GFCI on a 2-wire or 3-wire circuit will almost instantaneously trip if someone touches a hot/neutral fault or wire while they are grounded. That is why GFCI outlet are required in wet/damp areas where you are likely to be grounded (kitchens, bathrooms, basements, garages and outside).
But a GFCI will not trip if there is a hot to neutral short or hot/neutral to ground fault on the circuit/supply wire ... no wire protection, as that is the breakers job. That, and to clear ground faults (e.g. casing shorts) on 3-wire grounded circuits.
Check out GFCI outlets with a decent plug-in tester (e.g. GB Sure Wire). If the GCFI doesn't trip immediately at the outlet when you hit the button on the tester, or the circuit breaker trips instead of the outlet, there is a problem.
And nothing protects you if you touch or complete the circuit between the hot and neutral ... ZAP ... !(upload://199DFlLQN79csLOnKn0v2WaLDRe.gif)
Just my two nickles ... and I agree ... slap somebody ...
Robert O'Connor, PE
Eagle Engineering ?
Eagle Eye Inspections ?
NACHI Education Committee
I am absolutely amazed sometimes by how much thought goes into doing things wrong