[RE-wrenches] Fwd: Re: sizing up equipment ground per NEC 690.45

[Ray]

Once again, the '/Definitions/' Geek leers his ugly head. 690.45 
specifically applies to /PV Source/ and /PV Output/ /Circuit/s only.  
Checking the definitions in 690.2, both are defined as DC and before the 
inverter.  In your case, the circuit is defined as an /Inverter Output 
Circuit/. You are held to 250.122(B) and you have to increase the EGC 
proportionally with the increased conductor sizing.

Ray Walters

Remote Solar


On 10/17/17 12:34 PM, Dave Tedeyan wrote:
> Hi August,
>
> We have understood that exception to apply only to the DC side. The inverter
> output circuit would fall into typical ground sizing requirements which do
> state
> that the EGC should be upsized proportionally to the other conductors that
> are
> upsized for a voltage drop.
>
> Cheers,
> Dave
>
>
> *--*
>
>
> *Dave Tedeyan*
> *Project Engineer*
>
> *Taitem Engineering, PC*
> 10 Verizon Lane, Lansing, NY 14882
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> On Mon, Oct 16, 2017 at 4:54 PM, August Goers<august at luminalt.com>  wrote:
>
>> Hi Wrenches,
>>
>> Occasionally, we need to up-size the inverter output circuit conductor
>> sizes (on the inverter AC side) to avoid excessive voltage drop. For
>> example, we typically use # 10 conductors for a microinverter branch
>> circuit but occasionally need to up-size to # 8s. A similar scenario might
>> apply when we have inverters out on on a ground mount array and then have
>> really long AC runs back to the main service panel location.
>>
>> Do you think the exception in NEC 690.45 to up-sizing the equipment grounds
>> applies to these inverter output circuits or not? It is hard to tell
>> whether 690.45 is meant to only include PV source and PV output circuits:
>>
>> [image: Inline image 1]
>>
>> [image: Inline image 2]
>>
>> Best,
>>
>> August
>>
>> *August Goers*
>>
>> Luminalt Energy Corporation
>>
>> o: 415.641.4000
>>
>> www.luminalt.com
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