[RE-wrenches] AC Combiner with main breaker as system disconnect

[Glenn Burt]

I think the heavy duty version stems from its 600V rating for AC or DC, and
may not be necessary for 240V Service Equipment.

We always picked the heavy duty models, but I think that was primarily to
use as DC discos.

I don't see any reason why a general duty model could not be used in a
240VAC application as Service Equipment.

 

-Glenn

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jason
Szumlanski
Sent: Wednesday, March 12, 2014 6:20 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] AC Combiner with main breaker as system
disconnect

 

The D222NRB General Duty safety switch is service rated. Why do you say it
has to be heavy-duty?

 

Jason Szumlanski

Fafco Solar

 

 
<https://wisestamp.appspot.com/pixview.gif?p=chrome&v=3.31.0&t=1394662672015
&u=eb875d38140ce271> 

 

On Wed, Mar 12, 2014 at 5:32 PM, Brian Teitelbaum <bteitelbaum at aeesolar.com>
wrote:

One big omission, in the otherwise fine Soligent white paper, is that the
60A minimum disconnect has to be rated as "Service Equipment". Generally
this means a "Heavy-Duty" safety switch or Service-rated load center with
Main breaker. 

 

I don't see why an AC breaker panel, with a Main breaker, couldn't act as
the PV system disconnect, as long as it's Service-rated, a minimum of 60A,
and the utility does not require an external-handle disconnect, lockable in
the off position. Many utility companies still do.

 

Brian Teitelbaum

AEE Solar

 

 

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jason
Szumlanski
Sent: Wednesday, March 12, 2014 2:14 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] AC Combiner with main breaker as system
disconnect

 

Don't utter the word tap. :)

 

See:

http://www.soligent.net/documents/HappyLandings_v3.pdf

 

We usually specify a fusible disconnect for overcurrent protection when
grouping the PV AC combiner with the main premises disconnect is not
practical.

 

Jason Szumlanski

Fafco Solar


 

 
<https://wisestamp.appspot.com/pixview.gif?p=chrome&v=3.31.0&t=1394658190268
&u=eb875d38140ce271> 

 

On Wed, Mar 12, 2014 at 1:31 PM, <kevin at renovusenergy.com> wrote:

I am trying to determine whether an AC combiner panel (for multiple inverter
outputs) with main breaker can be also used as the PV system disconnect? 

This is for a line tap situation.  I am accustomed to doing these systems
with an AC combiner, and separate enclosure for a breaker style, line tap
over current protection.

Any thoughts/comments would be appreciated.  

Thanks,

Kevin


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