[RE-wrenches] Grounding detached buildings

[Chris Worcester]

Thanks Mark that helps!

 

Sincerely,

Chris Worcester

Solar Wind Works
NABCEP Certified PV Installer
Phone: 530-582-4503
Fax: 530-582-4603
www.solarwindworks.com <http://www.solarwindworks.com/> 
chris at solarwindworks.com
"Proven Energy Solutions"

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Mark Frye
Sent: Friday, November 13, 2009 7:22 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Grounding detached buildings

 

Try 250.32. In this case, you consider that the panels at the home are not
actually new "service enterance" equipment.  The "service" is up at the shed
and the home is part of two or more buildings supplied from a common
service.

 

Mark Frye 
Berkeley Solar Electric Systems 
303 Redbud Way 
Nevada City,  CA 95959 
(530) 401-8024 
 <http://www.berkeleysolar.com/> www.berkeleysolar.com  

 

 

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Chris
Worcester
Sent: Friday, November 13, 2009 7:06 AM
To: 'RE-wrenches'
Subject: [RE-wrenches] Grounding detached buildings

Hi fellow wrenches,

We just inherited a two year old off grid system consisting of a separate
home and a big shop/garage that has a mechanical room and battery room. The
OBFW500 power center feeds a main/meter panel. The two Kohler generators
(25kW LPG & 60kW Diesel) feed a transfer switch that feeds another
meter/mains panel. 

1. The previous electrician didn't run any grounding to the home with the
two service feeds, where there are two separate AC load centers, A 200A main
panel and a 100A subpanel for the overflow. both fed from the inverter
meter/mains panel. We have installed the ground one. Now he is claiming 

"code requires separate grounds on detached buildings. 1. House and garage
are not bonded together , they again have  

separate  ground-rods  as required."

I flat can't find any reference to his statement in the code, and he didn't
say where in the code he is referencing. I quoted NEC 250.50, 250.66 as my
reason to correct the lack of grounding between buildings.

 Can anyone shed some light on this, thanks.

Elsewhere I am removing redundant neutral to ground bonds in both the
generators, the generator meter/main panel the home's 200A main panel, and
leaving the one in the inverter meter/main as the one point of bonding.  We
grounded the generator chassis too.

 

Sincerely,

Chris Worcester

Solar Wind Works
NABCEP Certified PV Installer
Phone: 530-582-4503
Fax: 530-582-4603
www.solarwindworks.com <http://www.solarwindworks.com/> 
chris at solarwindworks.com
"Proven Energy Solutions"

 

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