600 VDC switches [RE-wrenches]

[Tom Lane, Energy Conservation Services]

thank you  gator tom
----- Original Message ----- 
From: <jberdner at sma-america.com>
To: <RE-wrenches at topica.com>
Sent: Monday, February 10, 2003 9:36 PM
Subject: RE: 600 VDC switches [RE-wrenches]


> Guys:
> 
> Yes, this is good news from Square D.
> We have been working on this one for over a year.
> Now that it has come to pass I want to jump in and take some credit.
> I know it is shameless, but I can't resist - sorry ;-)
> 
> Many people were involved but Tom Keene at Square D deserves most of the
> real credit.  He was a great champion for our industry inside Square D
> and I do not think we could have done it without his support.
> 
> First we had John Wiles and SWTDI run some tests for us and, based on
> John's data, it looked like the 361 could do 13 Amps. 
> Then Marv used the results to develop and get UL approval on a whole new
> test procedure specifically for PV system dc disconnects.  This was
> bucking tradition and was a lot harder than it sounds.  Thanks to Tim Z.
> at UL for the support on this one.
> 
> Then we had to get Square D to run the procedure that UL approved.
> Then we had to get Square D to run it again since they ran the old
> switch procedure by mistake and the switch did not pass the test that we
> already knew it would not pass (90 Amps at 600 Vdc for 50 cycles then
> 2000 cycles at 30 amps and 600 Vdc).  
> In the middle of all this Square D legal got involved and side tracked
> the whole thing for about 3 months.  This snafu was why we stopped
> recommending the HU361 for a couple of months.
> 
> Bottom Line - 1 switch can be the disconnect for up to 3 inverters.  One
> more point - The lugs are UL approved for 2 wires in each lug!
> The two positive strings can be combined in the switch with a single
> positive going out of the switch to the inverter.  The two negatives
> just pass through the switch uninpterrupted and land on 2 of 3 negative
> terminals in the inverter. 
> 
> Now I am trying to get some UL documentation on the new ratings for the
> switch from Square D.  Once we get it we will post it on our website or
> tell you how to find it on Square D's.  The UL file reference in E.H.'s
> post does not show the new ratings yet.
> 
> The next step is to get UL approval for a combination DC and AC
> disconnect in the same switch.
> 1 pole for PV positve / polymeric divider for seperation of circuits / 2
> poles for the 2 ac hots.  If we can get that, we have 1 disconnect that
> is both the ac and dc disconnect and meets the utility requirements.
> Keep your fingers crossed.
> 
> If you have any questions, or if I can be of any further assistance,
> please do not hesitate to contact me.
> 
> Best Regards,
> 
> John Berdner
> 
> SMA America, Inc.
> 12438 Loma Rica Drive, Unit C
> Grass Valley, CA  95945
> 530.273.4595 (voice)
> 530.274.7271 (fax) 
> 
> 
> -----Original Message-----
> From: Mangelsdorf, Marco [mailto:mmangelsdorf at hei.com] 
> Sent: Monday, February 10, 2003 4:10 PM
> To: RE-wrenches at topica.com
> Subject: RE: 600 VDC switches [RE-wrenches]
> 
> Good news, indeed.  From what source can we get this bugger?  Will it be
> immediately available?  
> 
> marco
> ProVision Technologies
> Hilo
> 
> Wrenches,
> 
> Good news from Square D on this thread. I found out today that Square D
> has
> received UL approval for use of the HU361 in PV systems up to 600VDC and
> not
> more than 13A per pole (no series switching or negative switching is
> required - 3 poles, 3 positives). See letter from Square D below.
> 
> E. H. Roy
> Solar Works, Inc.
> 64 Main Street
> Montpelier, VT 05602
> 1-800-339-7804 ext. 306
> ehroy at solar-works.com
> 
> 
> DATE: 2/10/03
> TO: E. H. Roy - Solar-works, Inc
> FROM: Bob Miller - Square D Company
> SUBJECT: Photovoltaic application of Safety Switches
> 
> E.H.,
> 
> Square D Company has obtained UL listing (File E2875, Vol. 1) for 30 amp
> non-fused heavy duty switches, HU361, HU361RB, HU361AWK and HU361DS,
> for
> use on photovoltaic systems. The 2002 National Electrical Code does not
> allow the negative conductor to be broken when operating switches on
> photovoltaic systems.  The above mentioned switches may be used on
> photovoltaic systems as shown below as long as the line voltage per pole
> does not exceed 600 Volts DC and the normal rated current per pole does
> not
> exceed 13 Amps DC.
> 
> Bob Miller
> Application Engineer
> Square D Company
> 859-243-8069
> 
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