I recently purchased some more three-prong to two-prong AC adapters. I
know you are supposed remove the screw that holds the face plate on,
plug the adapter in, and replace the screw through the "grounding"
strap on the adapter.
These adapters are also polarized, you can only plug them into the
receptacle one way. And when they are plugged in the only way they can
be, the "grounding" strap does not line up with the screw. It faces 180
degrees from it.
What is the reason for these adapters seemingly not being manufactured
True that; if you look at 2-wire connections to outlets, the metal frame
of the outlet isn't connected to *anything*. The only reason to use that
screw would be if you wanted to attach the adapter to the outlet. It
serves no electrical or safety function.
Napoleon won the battle of Waterloo. The German Wehrmacht won World War
II. The United States won in Vietnam, and the Soviets in Afghanistan.
Not <Always> True. In this 1960 house, the boxes were grounded, via the bond
wire being wrapped around the romex under the clamps. No, probably not to
current code, but better than nothing. I replaced the 2-hole outlets with
3-hole, and the 15-buck Magic Meter lit up and pronounced them grounded.
(Half of them were reversed polarity, and most were worn out, so I had to
yank them anyway....) This was old stiff romex with no slack, so I wasn't
about to try to uncoil the third wire to pigtail it to the outlets, and
there was no screw hole in the box for a ground wire.
If you don't have screw holes in the box, you can use grounding clips
that clip onto the edge of the box. You can get a bag of them for a
dollar or two at any hardware store.
You can also buy "self-grounding" outlets that are specifically designed
to ground through the yoke, though they are somewhat more expensive.
Actually, IF the wiring is armored cable or IF it is in EMT or other
metal conduit, and IF the conduit/metal sheathing is rated for ground
use and properly grounded, and IF it is a metal outlet box, then the
center screw that holds the cover plate to the outlet WILL be
Every complicated problem has a simple solution that doesn\'t work.
It will line up correctly with ONE of the outlets in the pair. These
adapters are designed as an expedient, and not for really permanent
setups. If you are going to use 3 prong fittings, the outlets should be
replaced accordingly. The problem is that in old installations, there
might not be a ground line run, or grouding only through the conduit.
Not sure what the code issue is on this.
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