Inverter Output Circuit and DC GEC requirements [RE-wrenches]

[Bill Brooks]

Trying again--Topica problems again

> -----Original Message-----
> From: Bill Brooks [mailto:bill at brooksolar.com]
> Sent: Monday, June 18, 2007 9:20 PM
> To: 'RE-wrenches at topica.com'
> Subject: RE: Inverter Output Circuit and DC GEC requirements [RE-wrenches]
> 
> Randy,
> 
> Here are some responses to your questions.
> 
> 1.) There are no specific prohibitions for the inverter output circuit.
> However, only allowable wiring methods are permitted. Many inverters
> require conduit connections because they only have conduit fittings to
> make the ac connections. Some inverter ac circuit can pass through the
> back into a protected wall cavity so NM cable could be used in that
> situation.
> 
> 2.) The inverter dc GEC generally must run from the inverter to the
> building grounding electrode or ac GEC provided that the ac GEC is at
> least as big as the dc GEC (690.47(C)).
> 
> The dc system ground must be in common with ac system ground unless you
> want to fry your inverter. If you are making your inverter connection to a
> separately derived 208Vac service within the commercial building, connect
> the PV system to that separately derived system ground. That should not be
> a routing problem at all. The inverter output conductors have to go to the
> same place as the dc GEC--explain your routing problem.
> 
> Bill.
> 
> Bill Brooks, PE
> Brooks Engineering
> 873 Kells Circle
> Vacaville, CA 95688
> office and mobile phone: 707-332-0761
> fax:707-451-7739
> email: billbrooks7 at yahoo.com
> web: www.brooksolar.com
> 
> Ecclesiastes 11:7 Light is sweet, and it pleases the eyes to see the sun.
> 
> 
> > -----Original Message-----
> > From: Randy Hatch [mailto:randy at third-sun.com]
> > Sent: Monday, June 18, 2007 9:01 AM
> > To: RE-wrenches at topica.com
> > Subject: Inverter Output Circuit and DC GEC requirements [RE-wrenches]
> >
> >
> >
> >             I was hoping that someone could help me to clear up a few
> > items
> > that I've been researching.
> >
> >
> >
> > 1)       Is the inverter output circuit conductor (utility interactive
> > inverter) required to be in conduit?  NEC reference?
> >
> > 2)       Is the DC GEC required to be run from the inverter to:
> >
> > a.       The DC GE and then bonded to the AC GE (690.47(1))
> >
> > b.       the AC GE (690.47(2))
> >
> > What should I do for school and commercial installations where providing
> a
> > dedicated DC GEC from the inverter/s to the AC grounding electrode
> system
> > can be considerably more difficult in terms of pathing, distance, etc...
> > Is
> > there a work-around?  NEC reference?
> >
> >
> >
> > Thanks.
> >
> >
> >
> > Randy Hatch
> >
> > Third Sun Solar and Wind Power
> >
> >
> >
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
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> >


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