It seems like it should be fine if you run one conduit to your shop inverter,
and another to a dc disconnect and underground to the house inverter, but I see
you running a bonding wire for the 2 GECs as well for some reason. You should
go
through the part of 250 about different GEC for
Thanks Nick,
250 talks about two seperate buildings with one service, and 230 talks about
one building with two services.
I don't think this particular situation has been contempated by the Code.
How big a deal would it be to just bond the two ground electrode systems
together and go along
Mark,
NEC 230.2(A) specifically allows two services for parallel power
production sources. While a feeder from the house is technically not
the same as a service, it should be allowed provided that there is a
disconnect grouped with the main service disconnect. A discussion with
the inspector
Sollega, cheap and easy..
Max Balchowsky
Design Engineer
SEE Systems
1048 Irvine Ave Suite 217
Newport Beach, Ca. 92660
760-403-6810
From: David Katz dk...@asis.com
To: RE-wrenches re-wrenches@lists.re-wrenches.org
Sent: Sat, April 16, 2011 10:52:24 PM
Thanks Ken,
I still don't see any configuration of equipment that would not involve
making an electrical connection between the two grounding systems of the two
seperate dwellings
In order to provide the required GFP for the PV modules, it seems both
inverters would have to mounted on the
Mark,
Separately derived is defined in article 100. Basically, a separately
derived system has no common conductors other than possibly equipment
ground.
By the definition in article 100 the feeder from the house may be a
separately derived system at the shop. It may not be if the house and
Thanks Ken,
I appreciate the information. But I am still not feeling very confident
about this.
Yes, you can run a feeder with a EGC from one building with a service to an
outbuilding and bond that EGC to a GE at the outbuilding, assuming that
there is no service at that out building. If there
Mark,
Are both buildings being fed from the same utility transformer?
I thank that may be a key question here
Brian Teitelbaum
AEE Solar
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mark Frye
Sent: Monday, April 18, 2011 12:42
I have not yet visited the site to see, but I would guess that they are feed
from the same transformer.
If they were, how would that make it OK?
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
http://www.berkeleysolar.com/
Would be a good one to ask John Wiles - he has been very responsive to my
questions.
Glenn Burt
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mark Frye
Sent: Sunday, April 17, 2011 9:09 PM
To: 'RE-wrenches'
Subject:
If each is separately derived, grounded and properly
installed, Why not?
Imagine a parking structure centrally located and 2 PV
systems installed on the roof for 2 separate buildings with
independent utility meters.
Dana Orzel
Great Solar Works, Inc
E - d...@solarwork.com
V -
Dana,
Exactly, why not? I can't find anything in the Code that says 'Thou shalt
not make a connection between the grounding system of two seperate services
located on two seperate buildings.
But re your example in this case the PV for both building will be located on
only one of the two.
In John's last Code Corner, he noted that it would be his last
column, so I'm no longer sure if he's as accessible as he has been.
If anyone knows more, please post here.
Allan
HP142: "Note: This will be the last Code Corner written by John
Wiles.
He will
Or another way to illustrate this problem:
There is nothing in the Code that would stop me from hauling out the old #6
and bonding my GEC to my next door neighbors GEC, if I wanted to?
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
I don't think you'll find anything in the NEC to prohibit that. NEC
250.52(A)(1) requires you to bond a metal underground water pipe (if it
exists) to the grounding electrode system. In older neighborhoods with metal
water pipes, the grounding electrode systems for all the houses are bonded
OK
Thanks everyone for your thoughtful support.
I did visit the AHJ and the lead plan checker did not see any reason to
prohibit the work.
He will be running it by his field electrical inspector to be sure he agrees
as well.
I will let you know if they come up with a reason to dis-allow
I don't know, Mark, but it seems to me that it might be an issue.
If you have two buildings, each with their own service, and connected to a
single T-former on a pole, I would think that you would create a ground loop if
you connected the grounds on the two services together. They would be
Folks,
I did send the question to John Wiles and he was gracious enough to reply.
Here is his response:
Mark:
Better ask the utility involved. Probably depends if they are on a common
transformer or not.
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
David:
Thanks for the reply. Today I installed a 6 watt module. This job is a
long drive so I could not pre-measure the idle draw. The generator draws
145 mA when not running. The 6 watt module charges at 300 mA.
As I figure it, with 4.5 average full sun hours, my module has about 1/2 as
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