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
Voice: (607) 930-3481 x6
www.taitem.com
On Mon, Oct 16, 2017 at 4:54 PM, August Goers<[email protected]> 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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