According to Tim Fischer :
"Steve Barker LT" wrote in message
...
doing this is a #1 no no in some electricians eyes. You've created a
series circuit so to speak and if that outlet were to go bad or come
loose, then you loose the power downstream also. Pigtailing is the
quality way of doing things.

I understand that a lot of people like pigtailing, but I don't see why a
properly-installed screw terminal would come loose any more easily than a
properly-installed pigtail...

It's not just a matter of "like". Pigtailing grounds has been
mandatory for a while, as have neutrals in most cases.

It's not a matter of safety of connection per-se, it's more a matter
of safety during rework. Eg: if you pull a device for replacement
(or abandoning it).

Pigtailing a ground means that even if you pull the device out,
the ground is maintained thru to the rest of the circuit, even if
you don't cut the hot.

Similarly, losing a neutral to downstream outlets can be bad.

Especially with shared neutral circuits.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.