[RE-wrenches] 690.4 (B) ???

[Max Balchowsky]

Kirk, we put a 4x4 gutter under the equipment (inverters, disconnects, AC and 
DC, if not using an Inverter with the DC disc integrated)
it looks neater and then you tie wrap the DC together And AC together in the 
gutter. 3/4 inch conduit risers to the equipment from the gutter and you have a 
neat looking install that meets code..... If the gutter can extend under the 
service panel it works even better (out the back of the gutter into the wall and 
up into the service panel) If you want pictures, e-mail me direct.......

 Max Balchowsky
Design Engineer
SEE Systems
1048 Irvine Ave Suite 217
Newport Beach, Ca. 92660
760-403-6810




________________________________
From: conrad geyser <conradg at cape.com>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Sat, April 9, 2011 7:24:49 PM
Subject: Re: [RE-wrenches] 690.4 (B) ???

Kirk,

Just zip tie your DC stuff together and your AC stuff together and keep the
two bundles separate.  Then they can be in the same trough.  At least that's
the way we do it.  I don't know about in the same conduit, I'd guess no. 

Conrad
Cotuit Solar

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kirk
Herander, VSE
Sent: Saturday, April 09, 2011 9:29 PM
To: kirk at vtsolar.com; 'RE-wrenches'
Subject: Re: [RE-wrenches] 690.4 (B) ???

PS Does this merely mean that conductors from more than one source must be
bundled("connected") together, but are allowed in the same conduit?

Kirk Herander
Vermont Solar Engineering
802.863.1202
NABCEP(tm) Certified Solar Installer
NYSERDA-eligible Installer
VT Solar Incentive Program Partner

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kirk
Herander, VSE
Sent: Saturday, April 09, 2011 9:10 PM
To: 'RE-wrenches'
Subject: [RE-wrenches] 690.4 (B) ???

2008 NEC states that:

(B) Conductors of Different Systems. Photovoltaic source circuits and
photovoltaic output circuits shall not be contained in the same raceway,
cable tray, cable, outlet box, junction box, or similar fitting as feeders
or branch circuits of other systems, unless the conductors of the different
systems are separated by a partition or are connected together.

Can anyone describe and give an example of what "connected together" means
to inverter PV circuits in the same conduit as a branch (load) circuit?

I have a single existing PVC conduit to a barn with an AC load subpanel. I
want to run the output conductors of an inverter combiner panel in the barn
through the same conduit to get to be main building. The fill / derating
calcs work to do this. The inspector says I have to run a new conduit for
the AC inverter combiner because the subpanel feeder and the combiner output
conductors are "not connected". But they are both connected to the main
building panel. Any insight will be appreciated. Thanks. I've also been told
that the NEC 2011 comments on 690.4 (B) clarify this. Can anyone comment?
Obviously I am not mixing DC and AC conductors.



Kirk Herander
Vermont Solar Engineering
802.863.1202
NABCEP(tm) Certified Solar Installer
NYSERDA-eligible Installer
VT Solar Incentive Program Partner

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