<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>Ok, I'll take a wild shot at it.. Generally, 2008 690.3 says 690 trumps all other articles in the NEC except 705 if you're in utility interactive land..</div><div>690.6(A) say's you're not dealing with a "photovoltaic source circuit", but "an Inverter Output Circuit"(B).. So I'm thinking you're up in 705 land... 690.6 (C) says discos in accordance with 690.15 + .17 "Shall be permitted" (not required), but it does say each module in a multiple module system "shall be provided with a disconnecting means"... (but that plugs are acceptable)... 690.III, .14 kicks things around a bit.. (but still refers to a "Photovoltaic" circuit).. although (D) refers to "Utility-Interactive Inverters", and <span>(3)<span id="GD__CURSOR"> in particular </span></span>kicks you back to .14(C)(1), which says you gotta have a disco.. and .14(D)(4) says " you gotta have a plaque and again kicks you up into 705... interestingly 690.17 says circuit breakers are fine as long as you can get to them in a hurry... I interpret 690.57 to mean "a disco needs to affect all sources connected to it".. not sure if it means for systems on separate structures or not... 690.64(B)(1) says Each source need's it's own circuit.... <span><span>hummm....</span><span id="GD__CURSOR"> </span></span><br></div><div><br></div><div> up in 705 land --<span><span id="GD__CURSOR"> </span></span>again, .10 says you gotta have a plaque or " directory"... 705.12(D) has teeth.. but doesn't really specify a location on the premises. 705.20 says you gotta have a disco for each source connected. .21 kinda says the same thing as .20... Sort of... 705.22 says what a disco pedigree looks like.. and again says a breaker is fine. 705.70 says more of the same, but still avoi<span><span id="GD__CURSOR"></span></span>ds location on the premises..<br></div><div><br></div><div> 2011 690.4(H) cleans things up a little, but still dosn't appear to get specific about location for discos involving separate buildings on the same premises. (unless I'm missing something).<br></div><div><br></div><div>I dunno.. sounds like you might be up against an AHJ thing... might be one of those ever elusive "best practices" things... </div><div> <span>I don't think the NEC "Requires" discos for all PV on site to be physically located at the same location..<span id="GD__CURSOR"> </span></span></div><div><span><span id="GD__CURSOR"><br></span></span></div><div>EMS logic might suggest that in case of emergencies, a quickly accessible / logically located Disco on each building with PV might make sense... at least a plaque.. A Quick Scan of NFPA70E article 120 and 130 seems to concur (again, unless I'm seriously missing something)... </div><div>I dunno... I think you're good... would be interesting to find out.. <br></div><div><br></div><div>Waiting for the eggs to fly.. db<br></div><div><br>Dan Brown<br>Foxfire Energy Corp.<br>Renewable Energy Systems<br>(802)-483-2564<br><a href="http://www.Foxfire-Energy.com">www.Foxfire-Energy.com</a><br>NABCEP #092907-44</div><div><br><br></div>
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-------- Original Message --------<br>
Subject: Re: [RE-wrenches] outdoor disconnects on multiple buildings<br>
From: <a href="mailto:Richard.L.Ratico@valley.net">Richard.L.Ratico@valley.net</a> (Richard L Ratico)<br>
Date: Sun, November 21, 2010 9:00 am<br>
To: <a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><br>
<br>
Hi Kirk,<br>
<br>
See 2008 NEC 225.30 thru 225.40. As I understand it, separate disconnects, <br>
up to six for each array, located on the main building, are required and<br>
appropriate. <br>
<br>
Dick Ratico<br>
Solarwind Electric<br>
<br>
--- You wrote:<br>
Hello,<br>
<br>
I'm working on a system which will have 5 kw on an outbuilding and 20kw on<br>
the main building, all Enphase inverters, I plan to put an AC disco for the<br>
5kw on the outside of its building and another on the outside of the main<br>
building for the 20 kw array. Both arrays feed into the main panel in the<br>
main building. But now I'm wondering if I might have to combine the 5kw and<br>
20 kw outputs so the outdoor disco on the main building shuts both arrays<br>
off. Any ideas here? I don't think the code addresses this clearly.<br>
<br>
<br>
<br>
Kirk Herander<br>
<br>
Vermont Solar Engineering<br>
<br>
802.863.1202<br>
<br>
NABCEP(tm) Certified Solar Installer<br>
<br>
NYSERDA-eligible Installer<br>
<br>
VT Solar Incentive Program Partner<br>
--- end of quote ---<br>
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