In article , "Robert11" wrote:
Questions:

a. What's an EGC ?

Equipment Grounding Conductor, i.e. the bare (or green) wire.

b. does this mean that if I have, e.g., two green ground wires in a box, I
should twist them together with an Additional pigtail, put a screw
twist-type connector over them, and then just run the new single pigtail to
the ground screw ?

That's correct.

What's wrong with just twisting together the two green ground leads and
running them together to the
screw (perhaps adding a small flat washer over them if the buildup looks a
bit large for the screw head) ?

Two problems:

First, "just twisting [them] together" is not a Code-approved method of
joining them. An approved pressure connector (such as a wire nut) is
*required*.

Second, the Code also requires that terminals used with more than one
conductor must be specifically approved for use with more than one conductor.
"Adding a small flat washer over them" does not qualify.

Adding an additional pigtail seems like a bit much.

Perhaps, but it is what the Code requires.

--
Regards,
Doug Miller (alphageek at milmac dot com)

Nobody ever left footprints in the sands of time by sitting on his butt.
And who wants to leave buttprints in the sands of time?