[RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions

[william at millersolar.com]

Wrenches:

 

Is there any issue with residual voltage on the DC feeder due to capacitor charge in the inverters?

 

William Miller

 

From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jerry Shafer
Sent: Monday, February 02, 2015 7:43 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions

 

Wrenches
We have installed some of these rapid shut down units and they are always located close to the array and ours kill the DC instantly as long as the inverter was running when this accures did not test it with inverters already off.
Jerry

On Feb 2, 2015 5:34 AM, "Christopher Warfel" <cwarfel at entech-engineering.com> wrote:

We have a interpretation problem among some people I work with with, and  690.12 Rapid Shut Down and the the 10 second time for reducing ac and dc conductors to 240ma, and 30V.  The word "initiation" seems to indicate that all affected conductors need to be at these levels within 10 seconds of de-energizing either the ac or dc conductors. If so, then the disconnects need to be co-located to meet this requirement if this interpretation is correct.




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