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

[Dave Tedeyan]

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
Voice: (607) 930-3481 x6
www.taitem.com

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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