[RE-wrenches] How to isolate the array DC

[Glenn Burt]

I only read where it is necessary to provide the operation of rapid shutdown
and the system be labeled accordingly, not that it needs a dedicated switch
to perform the function.

Glenn

-----Original Message-----
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
Behalf Of Mark Frye
Sent: Monday, February 02, 2015 4:24 PM
To: RE-wrenches
Subject: [RE-wrenches] How to isolate the array DC

In order to clear up the conversation...

I you put a relay in a box within 10 feet of the array on the roof, you can
use an relay with a DC rated Normally Open contact to open and
connect/isolate the array DC voltage.

You can drive the coil of that relay with either AC or DC, but either way,
if you lose voltage to drive the coil, the contact opens and isolates.

My point is, for simple grid-tied system, there is no need for a "stop" 
switch anywhere in the system. It doesn't matter whether the contactor coil
is driven by the premise AC or by a DC power supply connected to the premise
AC, when the the main is opened or the meter pulled, the array Dc will
become isolate.

Therefore, there is no need for the "stop" switch and yet as I understand
it, such a switch is now required by the Code. The switch is not needed but
is required.

Mark Frye
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