[RE-wrenches] How to isolate the array DC

[Mark Frye]

OK, good. So the various "initiator" switches being sold by various 
vendors are completely optional. Or rather, you can build a compliant 
rapid shut down system which does not include such a switch.

On 2/2/2015 1:36 PM, Glenn Burt wrote:
> 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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