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-Original Message-
From: RE-wrenches On Behalf Of Ray
Sent: Thursday, June 24, 2021 4:51 PM
To:re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] Grounding Top of Pole Mount Array with a Ufer
We always put our assump
alf Of Ray
Sent: Thursday, June 24, 2021 4:51 PM
To:
re-wrenches@lists.re-wrenches.org [6]
Subject: Re: [RE-wrenches] Grounding
Top of Pole Mount Array with a Ufer
We always put our assumption in our
plan notes, based on our interpretation of 250.52(A)(7). AHJs have never
questioned it, and we also tie th
e: [RE-wrenches] Grounding Top of Pole Mount Array with a Ufer
We always put our assumption in our plan notes, based on our interpretation of
250.52(A)(7). AHJs have never questioned it, and we also tie the pole to any
rebar, so its all one big happy grounding electrode.
Ray Walters
Remote So
e-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] Grounding Top of Pole Mount Array with a Ufer
We always put our assumption in our plan notes, based on our interpretation of
250.52(A)(7). AHJs have never questioned it, and we also tie the pole to any
rebar, so its all one big happy
We always put our assumption in our plan notes, based on our
interpretation of 250.52(A)(7). AHJs have never questioned it, and we
also tie the pole to any rebar, so its all one big happy grounding
electrode.
Ray Walters
Remote Solar
303 505-8760
On 6/24/21 6:49 PM, frenergy wrote:
Ray,
Ray,
I couldn't agree more, its been my experience over the
years that using 20 feet of #4 rebar in a building's footing was kosher
and accepted NEC 250.52(3). There's a heck of a lot more surface area
in 8" pipe 5-6 feet into the earth than rebar in a foundation footing.
The gr
Usually a steel pole in concrete has enough surface area to qualify as a
plate electrode under 250.52(A)(7). It needs to be at least 2 sq ft and
1/4" thick, and have an electrically conductive surface. So we just
drill and tap our ground connection into the pole, near the combiner box.
Ray W
For all of our free standing arrays we now use a Ufer clamp to the rebar either
cage or just anti spin rebar that is welded to the pole in the concrete, with
#4 braided copper up to the pole combiner box, inverter, etc. for our ground.
With a pole mount & a concrete base it is way easier & less e
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