[RE-wrenches] Rapid shutdown questions

[boB at midnitesolar.com]

   Ooooops  from Robin...


On 8/28/2014 11:00 PM, Robin Gudgel wrote:
> Bob, I was mistaken about NEC2017 covering all PV systems. IT will 
> still just be for buildings.



On 8/28/2014 4:53 PM, boB at midnitesolar.com wrote:
>
> >>>3) What about portable generators, and folks back feeding the grid 
> or house with little to no protection at all.
>
> Luckily, if the house is still connected to the grid when they try 
> this, the little generator will not be able to
> power the neighborhood.  Maybe not even the pole pig transformer's 
> magnetizing inductance current in
> some cases ?   It would more than likely trip the generator breaker or 
> slow down its engine or just
> stop the generator completely or toast it.
>
> boB
>
>
>
> On 8/28/2014 2:28 PM, Ray Walters wrote:
>> So this would make sense that this Rapid Shut down provision would 
>> cover all generator backup systems too, not just solar.
>> Considering auto start backup generators have been around for many 
>> decades, I have a few questions:
>> 1) Does NEC 2014 require Rapid shutdown for all generator systems, or 
>> is solar once again being singled out for additional requirements not 
>> applied to everyone else?
>> 2) What is the history of fire fighting and backup generators? It 
>> seems that there would be much more long term experience, than a hand 
>> full of incidents in the solar industry.
>> 3) What about portable generators, and folks back feeding the grid or 
>> house with little to no protection at all.  Are there safety 
>> precautions that fire fighters take to make sure a neighbor isn't 
>> powering up lines down the street?  I've seen too many male to male 
>> extension cords, so I know this is real issue, that can't be 
>> prevented by the NEC code alone.  Basically any idiot can go to Home 
>> depot and create a very dangerous situation quickly.
>>
>> R.Ray Walters
>> CTO, Solarray, Inc
>> Nabcep Certified PV Installer,
>> Licensed Master Electrician
>> Solar Design Engineer
>> 303 505-8760
>>
>> On 8/28/2014 1:16 PM, boB at midnitesolar.com wrote:
>>>
>>>  It would also make sense to shut off an auto start generator with 
>>> the Rapid Shutdown button. Some generators are designed to start up 
>>> upon loss of grid. Once the first responders have the meter pulled, 
>>> that could start up a generator and cause risk of shock.
>>> Robin Gudgels
>>>
>>>
>>

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