[RE-wrenches] Ct Utility test requirement?

[Chris Mason]

If you are using a load center to aggregate the inverter outputs, swap the
3 pole breaker for three single poles. Hopefully you can demonstrate only
one inverter works.
If the UL listing tests and certifies for this, why do they need to do it
in the field? Next they will want you to set up a full lab test suite.


On Mon, Aug 4, 2014 at 8:56 PM, Jerry Shafer <jerrysgarage01 at gmail.com>
wrote:

> If you using a AC disconnect shut off power to it install a jumper on two
> of the legs just testing once inverter is back on line pull the switch and
> see what happens. Swap jumper location and tetest, once you tesy all legs
> remove jumper wires.
> On Aug 4, 2014 7:43 AM, "Rebekah Hren" <rebekah.hren at gmail.com> wrote:
>
>> Al,
>> I have witnessed this test in NC several times, but with medium voltage
>> connected systems, not systems connected to a building service.  A medium
>> voltage subcontractor used a disconnect stick to open one phase at a time
>> at the fused cutout point of delivery to the distribution network (on the
>> high side of the transformers) . We learned to do the test early in the
>> morning with the array divided in subsections to keep the current as low as
>> possible at the POD because there is an arc pulled when one phase is
>> opened.
>>
>> The phase current was being monitored during the test to insure that the
>> inverters stopped exporting current to the other two phases when one phase
>> was lost.
>> It's been awhile, so there may be a better/safer way to do this test for
>> MV connected systems now that I'm not aware of...would be happy to hear
>> about it if so.
>>
>> If this is a PV system connected to a building service this wouldn't be
>> the way to do this test.
>> Cheers,
>> Rebekah Hren
>>
>>
>>
>> On Mon, Aug 4, 2014 at 11:24 AM, Allen Frishman <amfrish at aeonsolar.com>
>> wrote:
>>
>>> Wrenchers,
>>> The Ct Utility company CL&P requires the following as part of the
>>> verification test.
>>> "Because this is a three-phase service, the witness test must also
>>> demonstrate that the inverter shuts down upon loss of each individual phase"
>>>
>>> Any recommendations on how to do this test safely?
>>>
>>> *Al Frishman*
>>> AeonSolar
>>>
>>> *(917) 699-6641 <%28917%29%20699-6641> - cell*
>>> *(888) 460-2867 <%28888%29%20460-2867>*
>>> *www.aeonsolar.com <http://www.aeonsolar.com/>*
>>>
>>>
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>>
>> --
>> Tel: 336.266.8800
>> NABCEP Certified Solar PV Installation Professional™ 091209-85
>> NC Licensed Electrical Contractor
>>
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-- 
Chris Mason
NABCEP Certified Solar PV Installer™
Solar Design Engineer
Generac Generators Industrial technician

www.cometsolar.com <http://www.cometenergysystems.com>
264.235.5670
869.662.5670
Skype: netconcepts
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