I just remembered that I've seen Deltas pre-installed (by the factory)
within Satcons- at least the 50s, and I think they're in the 250s as
well. I guess they'd look a bit weird sticking out of the cabinet!
Dave Palumbo wrote:
Bill,
I checked with Delta and they say the LA’s are designed to be mounted
inside, or, outside the box. On their product sheets that came with the
arrestors in years past they clearly showed the LA’s inside the load
center. In fact that is the way they are still showing them used on
their sales web site http://www.deltasurgeprotectors.com/home.cfm
Maybe the lawyers want them shown in the box for liability concerns. The
tech person I spoke with says they recommend putting them in the box if
they are around combustible material such as insulation. Could that also
be dry grass around a ground mount?
They did say that on LA’s manufactured 2009 and later that the jar no
longer cracks, they have a “VIP plug” on the bottom of the jar that pops
out when the LA is done. They did say that on big, close by strikes, all
bets are off on just the VIP plug popping out. Expect more damage in
that case.
BTW, great article in Solar Pro on PV array voltage issues.
Thanks,
Dave
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *Bill
Brooks
*Sent:* Thursday, September 02, 2010 12:46 PM
*To:* 'RE-wrenches'
*Subject:* Re: [RE-wrenches] Delta LA's
David,
They are supposed to be mounted outside boxes so that you can clearly
see when they have been used up. Sand makes glass that expands and
breaks the plastic. They used to be porcelain for the very same reason.
If you are concerned about unqualified people coming in contact with
conductors, put a guard around it.
Bill.
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *Dave
Palumbo
*Sent:* Wednesday, September 01, 2010 5:32 PM
*To:* 'RE-wrenches'
*Subject:* Re: [RE-wrenches] Delta LA's
I am concerned with Delta LA 600VDC cans being mounted exterior from
J-boxes (or disconnect switches) on ground mounts.
I remember hearing from an old hand that these devices can fail in a
manner that could possibly expose the wiring to human hands. The wires
would have high voltage DC potential. Not something we need in our industry.
Am I worrying about something that can’t happen? Or should these be in
PVC boxes?
David Palumbo
Independent Power LLC
Offices in Lamoille and the Champlain Valley, Vermont
802.888.7194
www.independentpowerllc.com
NABCEP Certified Solar PV Installer™
Vermont RE Incentive Program Partner
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *North
Texas Renewable Energy Inc
*Sent:* Tuesday, August 31, 2010 10:07 PM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] Testing LSAs
For the first time since 2004 we got a residential PV red tag for
non-listed surge supressors. I just took them off and replaced them
after we got the green tag. Of course he also red-tagged the copper
ground plate because it was not thick enough. Go figure....
Jim Duncan
North Texas Renewable Energy
-----Original Message-----
*From:* [email protected]
[mailto:[email protected]]*on Behalf Of
*Andrew Truitt
*Sent:* Tuesday, August 31, 2010 8:09 PM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] Testing LSAs
Question: Since the Delta lightning arrestors are not UL Listed, do
they threaten the UL compliance of the PV system as a whole?
- Andrew Truitt
Currently of Standard Solar
Free agent in the Denver area as of 10/6/10
On Tue, Aug 24, 2010 at 6:02 PM, Peter Parrish
<[email protected]
<mailto:[email protected]>> wrote:
I would think that an ohmmeter set to the 10 Mega-ohm setting (or the
highest setting possible), would be the first test. I would like to see
something on the order of 750 k-ohms (3/4 of a mega-ohm).
But the system should be tested at a higher voltage, than that available
from a DMM. Apply 240 Vac and measure the RMS current. It should be
should
be 0.3 mA or less.
Finally, these puppies really need to be tested at much higher voltages,
perhaps someone knows how to use that megohmmeter to test? What does the
manu recommend, “if suspect, throw it away and buy a new one”?
- 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
[email protected] <mailto:[email protected]>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
________________________________________
From: [email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] On Behalf Of
Kristopher
Schmid
Sent: Tuesday, August 24, 2010 1:30 PM
To: 'RE-wrenches'
Subject: [RE-wrenches] Testing LSAs
What is the best method for testing the integrity of a DC and/or AC
lightning surge arrestor? Specifically, i use the Delta LA units. I know
they should be replaced if they look Bar-B-Qued, but otherwise...?
Thanks,
Kris Schmid
Legacy Solar
864 Clam Falls Trail
Frederic, WI 54837
715-653-4295
[email protected] <mailto:[email protected]>
www.legacysolar.com <http://www.legacysolar.com>
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