Hi Mick,
WEEB lugs can use either solid or stranded. One wire up to 6 AWG or two
wires of 10AWG.
Best Regards,
Brian Wiley
Wiley Electronics LLC
On 1/14/2011 8:15 PM, Mick Abraham wrote:
Kindly bear with me as I go "back to basics". #10 cu has been my old
standby for bonding the metal solar module frames but in recent years
Arthur Ruden @ Sharp told me to use nothing smaller than #8. I don't
know if other major PV mfr's have a similar spec or not but before I
buy a spool...
The new (and appealing) Tyco SolKlamp product calls for solid wire
only, not stranded, if I recall correctly. I've never used the solid
material because of the bending difficulty but I now wonder if other
grounding methods: WEEB lugs, lay-in lugs, etc. also prefer the use of
a solid grounding conductor instead of stranded.
Opinions and education are welcomed. As always, the Wrench List is the
Bomb!
Mick Abraham, Proprietor
www.abrahamsolar.com <http://www.abrahamsolar.com>
Voice: 970-731-4675
On Fri, Jan 14, 2011 at 12:45 PM, Kelly Keilwitz, Whidbey Sun & Wind
<ke...@whidbeysunwind.com <mailto:ke...@whidbeysunwind.com>> wrote:
Peter,
Yes the #10 XHHW (2) we use is green-jacketed, and 90˚ rated. We
get it through our local electrical supply house.
Kelly Keilwitz, P.E.
Whidbey Sun & Wind
Renewable Energy Systems
ke...@whidbeysunwind.com <mailto:ke...@whidbeysunwind.com>
360-678-7131
On Jan 14, 2011, at 11:04 AM, Peter Parrish wrote:
Great idea Kelly! I didn't know one could get green jacketed
USE or XHHW. Do
you have a source? Also, do you think that we might need wire
rated "-2" for
90 deg C wet locations. I know that this is not a current carrying
conductor, but roof tops are definitely 90 deg C wet
environments. Your
thoughts?
- Peter
Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
CA Lic. 854779, NABCEP Cert. 031806-26
peter.parr...@calsolareng.com
<mailto:peter.parr...@calsolareng.com>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
<mailto:re-wrenches-boun...@lists.re-wrenches.org>
[mailto:re-wrenches-boun...@lists.re-wrenches.org
<mailto:re-wrenches-boun...@lists.re-wrenches.org>] On Behalf
Of Kelly
Keilwitz, Whidbey Sun & Wind
Sent: Friday, January 14, 2011 10:14 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Incompatible Metals
Peter,
I have never understood the common practice of using bare copper
ground wire on and against aluminum frames and modules. It
always has
been a dissimilar metals issue. Just look anywhere copper has set
against aluminum for awhile.
We use #10 green jacketed Cu USE or XHHW conductor and strip
away the
jacket at each lug, using No-Ox on that section of bare wire
at the
lug. The wire can be tucked in to the module frames and with
the PV
conductors.
Kelly Keilwitz, P.E.
Whidbey Sun & Wind
Renewable Energy Systems
ke...@whidbeysunwind.com <mailto:ke...@whidbeysunwind.com>
360-678-7131
On Jan 14, 2011, at 7:36 AM, Peter Parrish wrote:
One of my students who is currently responsible for
standing for
inspection
at their company encountered a inspector who made an
interesting
point about
incompatible metals (i.e. copper and anodized aluminum).
The PV system in question used outdoor rated lay-in lugs
to bond the
rails
to bare copper wire (so far so good). The ground wire was
then zip-
tied to
the rail to carry it to the point where it entered a
junction box
along with
the rest of the PV conductors.
The inspector was concerned with the fact that the bare
copper was in
contact with the aluminum rails and that this might cause
galvanic
corrosion
and subsequent failure of the grounding.
I have never encountered this issue before and I wonder if
anyone
else has
and what was the outcome.
As an aside: I do know that 10 AWG and 12 AWG solid bare
copper
wire can be
purchased "pre-tinned" (maybe not tin per se, but coated).
We did so
by
mistake. We used it up, but not before one inspector
questioned its
use for
the purpose of grounding our system. We showed him the UL
label on
the spool
and scraped off the coating to expose the copper core and that
satisfied
him. To this day I don't know if the use of this wire for
grounding
was
among its intended purposes.
- Peter
Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
CA Lic. 854779, NABCEP Cert. 031806-26
peter.parr...@calsolareng.com
<mailto:peter.parr...@calsolareng.com>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
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