Originally Posted By: jpeck
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Lots of older ones around, but major electrical supply houses go through them so fast I doubt the have the older ones.
The older ones will be in the smaller stores and places which do not have a big turn over on them.
By the way, I've been discussing the new 'lock out' GFCI with the guy at Leviton and do not like all I hear about the new GFCIs (theirs).
The old GFCIs would create an internal simulated ground fault current (bypassing the sensing coil), causing the sensing coil to 'detect a ground fault' and trip. That was the good part, the test button really tested the GFCIs ability to detect and clear a ground fault by tripping.
The bad thing about the old GFCIs was it that it would reset under various improper wiring conditions. This was not good.
The new Leviton 'lock out' GFCIs do not test the GFCIs ability to detect a ground fault and then trip and clear the ground fault. Pressing the 'Test' button MECHANICALLY trips the switch inside the GFCI, and a latch locks the switch open. That's bad (in my opinion, I want to know that the sensing mechanism can actually 'trip' the GFCI off).
Now, upon releasing the 'Test' switch, the GFCI tests the sensing circuit (with a similar internal ground fault simulation) releases the 'locked out' latch, but only if some other test also check okay. I.e., line / load reversed, reverse polarity, and other checks. That's a good thing.
Each has pluses and minuses.
I want, first and foremost, to be able to check that a ground fault will actually trip the GFCI (that the switching mechanism does not get stuck closed). To me, this is foremost for safety, being able to verify it actually trips under fault conditions. The old ones did this, the new Leviton does not.
Second, I want it to not reset if there is a wiring problem. That, to me, is a secondary safety aspect. The old ones did not do this, the new Leviton does.
To those who have for so long said "The 'Test' button only mechanically trips the GFCI switch." are, for Leviton GFCIs, finally now correct.
The new GFCIs can still be remotely tested with GFCI testers, except that there is no longer any way to test for tripping off when installed on two-wire ungrounded circuits.
So to keep harping on this, but - to me - being able to actually test the ground fault tripping ability should come first.