[RE-wrenches] Finding ground faults

[boB at midnitesolar.com]

Ooops !!  Sorry about that one !!    That was from 1741...

Still applicable of course but NOT   NEC.

That was applicable from 2007 though.

boB




On 5/23/2012 6:34 PM, boB at midnitesolar.com wrote:
> On 5/23/2012 4:44 PM, Darryl Thayer wrote:
>> I sure do not like the way the X brand installed their charge 
>> controller, Also the code says that all strings must open if one 
>> string is faulted.  your breaker does this up to 4 strings.
>> DT
>>
>
>
> I think that this is the pertinent part of the code regarding this...
>
> In part...
>
> 31.1 Inverters or charge controllers with direct photovoltaic inputs 
> from a grounded photovoltaic array or
>
> arrays shall be provided with a ground-fault detector/interrupter 
> (GFDI). The GFDI shall be capable of
>
> detecting a ground fault, providing an indication of the fault, 
> interrupting the flow of fault current, and either
>
> isolating the faulted array section or disabling the inverter to cease 
> the export of power.
>
>
>
> This may very well change in the 2014 NEC from what I understand.
>
> boB
>
>
>
>> *From:* Steve Higgins <shiggins at outbackpower.com>
>> *To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
>> *Sent:* Wednesday, May 23, 2012 2:18 PM
>> *Subject:* Re: [RE-wrenches] Finding ground faults
>>
>> From what I understand, future controllers from Outback Power will 
>> incorporate the Ground Fault detection into the controller.
>> Steve Higgins
>> Sales Application Engineering Mgr
>> Direct 360-618-4313
>> Outback Power Technologies
>> 5917 195th Street NE Arlington, Washington 98223
>>
>> *From:* re-wrenches-bounces at lists.re-wrenches.org 
>> [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of 
>> *William Miller
>> *Sent:* Wednesday, May 23, 2012 11:22 AM
>> *To:* RE-wrenches
>> *Subject:* Re: [RE-wrenches] Finding ground faults
>>
>> Steve:
>>
>> IMHO, a brilliant suggestion.
>>
>> William Miller
>>
>>
>> At 11:19 AM 5/23/2012, you wrote:
>>> Steve,
>>>
>>> It would be appropriate for the GFDI to have 80-amp rated contacts 
>>> that do not have an over-current trip mechanism. IMHO, the fact that 
>>> they can trip on over-current and unnecessarily interrupt the dc 
>>> system bond is a serious design flaw.
>>>
>>> Kent Osterberg
>>> Blue Mountain Solar, Inc.
>>> www.bluemountainsolar.com  <http://www.bluemountainsolar.com>
>>

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