In ,
DerbyDad03 typed:
On Oct 14, 2:01 pm, bud-- wrote:
On 10/10/2011 10:17 AM, DerbyDad03 wrote:





On Oct 10, 10:45 am,
wrote:
On 10/8/2011 7:03 AM, wrote:

OK, so now we have the switch grounding question
resolved. But there was mention of a difference for
receptacles? So, what is the rule for a receptacle
with a metal box?

1. Surface metal box (handybox, ...) with 2 screws
securing the receptacle strap to the box. Often the
screws have a paper or similar disc on the screws to
keep them attached to the loose receptacle - at least
one disc has to be removed.

I just installed a Leviton receptacle and 2 Leviton
switches, a STSP and a STDP.

All three devices had a paper disc on 1 screw and a
metal bracket that was riveted to the strap for the
other screw.

Here's a pic:

http://i.pgcdn.com/pi/75/87/77/758777524_260.jpg

No need to remove a disc as the devices are "self
grounding" - assuming the box is grounded, of course.

That is #3 below. Many receptacles (particularly cheap
ones) don't have the metal clip from yoke to screw and
you have to remove at least 1 of the paper discs.





2- Receptacle attaches to metal cover on metal box -
all I can think of are for 4" square boxes. Receptacle
has to attach to the cover with 2 screws (a few other
requirements). Old covers have the receptacle attached
to the cover with one screw.

3. "Self grounding" receptacles with a clip from
the yoke to the screws, metal box.

4. In almost all other cases, a ground wire to the
receptacle.

(406.11, 250.146)- Hide quoted text -

- Show quoted text -- Hide quoted text -

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I'm not arguing, just curious...

Why do you need to remove the paper disc?

If the device is tightened securely then there is a
grounding path since the screw head contacts the device
and the screw threads contact the threads of the box. If
the box is not tightened securely, then even if the disc
is removed, the connection would still be suspect.

Is removing the disc just so that there is a more contact
than just the screw head and threads?

No response from here caand be deemed correct as only your local code
enforcemant offce knows whether they have requiremenrs over & above the NEC
etc.. Check with them for the fnal word regardless of what anyone here tels
you.
--

HTH,

Twayne`