Re: [RE-wrenches] How to isolate the array DC

The inverters' input capacitors may be charged and so that must also be isolated near the inverter. A grid operated contactor will not work for a battery-back up system. Also, 600V DC can weld contacts closed and if this happens and there is no feedback to show that the contacts definitely

Re: [RE-wrenches] How to isolate the array DC

Ours does something has to do it Jerry On Feb 2, 2015 11:37 AM, "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

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

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-boun...@lists.re-wrenches.org] On Behalf Of Jerry Shafer Sent: Monday, February 02, 2015 7:43 AM To: RE-wrenches Subject:

Re: [RE-wrenches] How to isolate the array DC

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 operati

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

I thought it was dc only also, but PV System Conductors is not defined as dc, so it could be interpreted as ac and dc. Chris On 2/2/2015 11:14 AM, Glenn Burt wrote: Chris, I am not seeing any code reference to AC being affected by 690.12. in fact it seems to specifically address only DC circuit

Re: [RE-wrenches] How to isolate the array DC

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-boun...@lists.re-wrenches.org] On Behalf Of Mark

[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,

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

Right, so the the "kill" switch is not really needed, but yet it is required! ? On 2/2/2015 1:09 PM, Jerry Shafer wrote: You pull the meter you close the contact thats it so ypu dont hit the button but same results On Feb 2, 2015 11:06 AM, "Mark Frye" >

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

You pull the meter you close the contact thats it so ypu dont hit the button but same results On Feb 2, 2015 11:06 AM, "Mark Frye" wrote: > I really do wonder then... > > Right now, you go up to the burning house and pull the meter, bingo, no AC > anywhere. So why do we need the "kill" switch ne

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

I really do wonder then... Right now, you go up to the burning house and pull the meter, bingo, no AC anywhere. So why do we need the "kill" switch next to the service (or where ever) IF you drive the roof top contactor with 120vac or with 24 vdc made from a power supply powered by 120vac.

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

As i recall it was 24 volt On Feb 2, 2015 8:28 AM, "Mark Frye" wrote: > OK. So did you run a line 120V up to the box on the roof to energize the > coil of the relay up there? > > Mark Frye > > On 2/2/2015 9:13 AM, Jerry Shafer wrote: > > The units we have used have a large contactor inside the

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

I see. So they have another box on the ground floor with the "kill" switch and that box includes a 120/240 vac to 24vdc xfrm to drive the contactor coil on the roof? So you run 120/240 vac to the box with the "kill" switch? Mark Frye On 2/2/2015 10:52 AM, Glenn Burt wrote: Looks like they u

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

Looks like they use 24VDC for contactor activation, not 120VAC. From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mark Frye Sent: Monday, February 02, 2015 1:29 PM To: RE-wrenches Subject: Re: [RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions OK.

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

OK. So did you run a line 120V up to the box on the roof to energize the coil of the relay up there? Mark Frye On 2/2/2015 9:13 AM, Jerry Shafer wrote: The units we have used have a large contactor inside the combiner box made by AMtec Solar. this was required to control the shut down include

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

The units we have used have a large contactor inside the combiner box made by AMtec Solar. this was required to control the shut down includes a fire button done on the ground floor Jerry On Mon, Feb 2, 2015 at 5:49 AM, Mark Frye wrote: > Jerry, > > What unit did you use? > > Mark Frye > > > On

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

Chris, I am not seeing any code reference to AC being affected by 690.12. in fact it seems to specifically address only DC circuits. In Mike Holt's new PV and the NEC book, his note recommends that the rapid shutdown initiator be located near the service equipment, however this is not addressed by

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

Jerry, What unit did you use? Mark Frye On 2/2/2015 7:43 AM, Jerry Shafer wrote: 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

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" wrote:

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

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