The best way to install the ground, and the code compliant way, would be to
remove the ground that is attached to the receptacle, at the receptacle,
and
leave it attached to the box. Then wirenut that wire to the wire coming
from your service panel along with another 6" piece of ground wire and
attach new that piece to receptacle. That way, both the box and the
receptacle are independently ground, this is called "pigtailing" the
ground.
It is not safe, nor is it code compliant, to have either the box or the
receptacle not grounded independently.
"obanion" <obanion@[EMAIL PROTECTED]
> wrote in message
news:1I6cnZpWGOEUKg2iU-KYjA@[EMAIL PROTECTED]
> I know the basics on residential wiring, and have done various indoor
wiring
> projects, but I have a question for you regarding an outdoor project. I
> want to install a 30 amp 110V receptacle for an RV. I purchased a
> receptacle that is already mounted inside of a metal box. I am planning
on
> mounting it to a metal shed. The receptacle will be on its own 30 amp
> circuit on 10# wire. From the factory, the receptacle is grounded to
the
> metal box by a wire from the grounding terminal on the receptacle to a
> terminal mounted on the box. If the receptacle is grounded to the metal
> box, how should I ground the box? If I were to remove this wire and
connect
> the receptacle to the grounding wire going back to my service panel, the
box
> would not be grounded. Would this be safe? Any advice that anyone
could
> give me would be much appreciated.
>
>
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