[RE-wrenches] 690.14 (4) Max Number of Disconnects

Thu Jan 13 16:12:24 PST 2011

This is based on an inverter that can be mounted outdoors.
Here we cannot mount outdoors and inverters have to be
indoors even if it is just a shed due to temp ratings -30 F
one many years ago. Most inverters are rated to -14F.

We have to install an AC disconnect external even if the
main AC panel is out doors and the breaker could or would
serve as the point of disconnect.

What does your AHJ require in the colder climates?

Dana Orzel

Great Solar Works, Inc

E - dana at solarwork.com

V - 970.626.5253

F - 970.626.4140

C - 970.209.4076

web - www.solarwork.com

"Responsible Technologies for Responsible People since 1988"

Do not ever believe anything, but seriously trust through
action.

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf
Of Al Frishman
Sent: Thursday, January 13, 2011 9:24 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] 690.14 (4) Max Number of
Disconnects

Mark,

See answers to your questions below:

Al Frishman
AeonSolar

(917) 699-6641 - cell
(888) 460-2867
www.aeonsolar.com <http://www.aeonsolar.com/> 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf
Of Mark Frye
Sent: Wednesday, January 12, 2011 5:26 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] 690.14 (4) Max Number of
Disconnects

OK,

So what is your plan with regard to 690.14 (D)?

All inverters will have a integrated DC disconnect and I
will install a AC Disco. next to each inverter.

It is interesting to ask, do the disconnects required by
690.14 (D) also have to comply with or be counted in with
690.14 (4) and (5).

690.13 and 690.14 are pretty confusing in the use of the
term disconnect. Which sections apply to the disconnecting
DC PV source circuits and which sections apply to AC PV
system circuit, which to both? Can the switches integrated
into some inverter by the manufacturer be regarded as the
disconnects required in these sections?

Here is my take:  The fused disconnect in the basement is
the PV system disconnecting means of which there is only
one. This switch meets the requirements of 690.15 "...A
single disconnecting means in accordance with 690.17 shall
be permitted for the combined ac output of one or more
inverters or ac modules in an interactive system." It meets
the requirements 690.14 (C) (1) Exception so long as you
comply with 690.31 (E). You still need additional
disconnects on the roof and labelling in accordance with
690.14 (D), but they don't have to comply with 690.14 (4)
(5) so long as there ac outpust are routed thru the 8th
floor load center and thru the switch in the basement.

I assume that the fused disconnect is co-located in the
basement with the service equipment?   yes

Mark Frye 
Berkeley Solar Electric Systems 
303 Redbud Way 
Nevada City,  CA 95959 
(530) 401-8024 
 <http://www.berkeleysolar.com/> www.berkeleysolar.com  

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf
Of Al Frishman
Sent: Wednesday, January 12, 2011 1:55 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] 690.14 (4) Max Number of
Disconnects

Hi Mark,

Two will be in the same room as the panel and the rest will
be located on different sections of roof.

Al

Al Frishman
AeonSolar

(917) 699-6641 - cell
(888) 460-2867
www.aeonsolar.com <http://www.aeonsolar.com/> 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf
Of Mark Frye
Sent: Wednesday, January 12, 2011 4:49 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] 690.14 (4) Max Number of
Disconnects

Al,

Are the inverters located inside on the 8th floor with the
MLP panel or are they located on the roof?

Mark Frye 
Berkeley Solar Electric Systems 
303 Redbud Way 
Nevada City,  CA 95959 
(530) 401-8024 
 <http://www.berkeleysolar.com/> www.berkeleysolar.com  

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf
Of Al Frishman
Sent: Wednesday, January 12, 2011 1:11 PM
To: re-wrenches at lists.re-wrenches.org
Subject: [RE-wrenches] 690.14 (4) Max Number of Disconnects

Hi Wrencher's

I am working on a system with 10 inverters.  The output of
all 10 single phase inverters will be combined in a main lug
only panel located on the 8th floor (each inverter will have
a 2 pole breaker).  The MLO Panel will be protected by a
fused switch located in the basement.  Does the panel on the
8th floor used to combine all 10 inverters need to have a
main breaker in order to comply with 690.14 (4)?   

Any and all feedback is appreciated.

Al Frishman
AeonSolar

(917) 699-6641 - cell
(888) 460-2867
www.aeonsolar.com <http://www.aeonsolar.com/> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20110113/6d342ad0/attachment-0004.html>