[Shop-talk] Fwd: More wiring questions.

[David Scheidt]

On Fri, Oct 2, 2009 at 10:57 AM, Randall <tr3driver at ca.rr.com> wrote:

> > I bought a junction box and was amazed to find that they don't include a
> > ground bar.  Why not?
>
> Mostly so they can sell it to you separately ... in some cases it's not
> required.
>

And in some, it's prohibited.


>
> > In the building, do I run a separate ground spike?
>
> I don't know what the NEC requires (or local code in your area); but that
> is
> what I would do.
>

NEC 2008 makes a bunch of changes to how this is required to be done.  As I
understand things (and i might be wrong) it requires a four-wire connection
to the main panel, prohibits bonding neutral and ground in the sub-panel,
and requires a ground connection at the subpanel.  That's typically a
grounding rod, but there are other options.

(In previous editions of the code, you were allowed to use a three wire
connection (no ground), as long as there wasn't a metallic connection
between the building. The problem with this is that someone will come along
and add one later.  Then you get scary ground loops.  )


-- 
David Scheidt
dmscheidt at gmail.com



-- 
David Scheidt
dmscheidt at gmail.com