According to Mike Ruskai :
On Thu, 15 Apr 2004 19:39:35 -0400, Jeff Wisnia wrote:

If you do that, please epoxy screws or something into the ground holes
on that outlet as a warning to everyone that it's *not* grounded.

Yeah, that's much more sensible than simply marking the outlet as not
grounded.

Right. Which is why the NEC explicitly disallows that.

The CEC used to recommend filling the third prong. Not anymore.

Install GFCIs, use the "not grounded" stickers that come with them and
stick 'em to all of the outlets you've protected with the GFCI.

That's all you need to do.

[Aside from NOT interconnecting grounds on outlets that are on a 2 wire
circuit.]
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.