Friends:
I have an NEC code question on an upcoming project. It is a home that has
an existing 8 kW ground-mounted grid-tied system. The owner wants to add
another 10 kW of grid-tied PV. My question is about 705.12, point of
connection. Specifically section (D)(1). That section states:
*
Here in upstate NY, we have certainly had multiple inverter breakers land
in the main panel. In a situation like yours, we have also left the old
system as a load side connection, and then turned the new system in to a
supply side connection so that the bus bar in the main panel is not
overloaded.
Just reading more slowly, each inverter has to be on its on separate
disconnect means. You cannot put multiple inverters on the same
disconnecting means unless there are individual disconnecting means
upstream.
On 2/25/2019 10:53 AM, William Miller wrote:
Friends:
I have an NEC code questio
Hi Chris and William
There was certainly no intention to mandate that all inverters connect to
one OCPD/disconnect.But 705.12(B)(1) in 2017 clarifies that systems like
Enphase could have multiple inverters on one breaker, certainly not that
all inverters in a building have to be on breaker.
If
I should follow up to say that yes Chris is correct - each inverter does
require its own equipment disconnects (AC and DC) per 690.15, but those can
be connectors, like for Enphase, or any number of other things, as detailed
in 690.15. If you try to keep system and equipment disconnect rules
separa
Yes, microinverters and now I would think other typologies will be
included with module level disconnects becoming more common and I guess
required. So, as long as you can disconnect each non microinverter
individually, and microinverter strings by one disconnect, you should
meeting the intent.
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