[RE-wrenches] Grounding Separately Derived AC System

[Dave Palumbo]

Regarding NEC Article 250.30 does Informational Note #1 mean that a standard
(no battery) grid-tied PV system is not a Separately Derived System?

 

I'm primarily interested on the consensus view of Bonding the Neutral
(grounded conductor) to Equipment Ground in a 60 Amp Fused Disconnect
located between the 240VAC inverter output and AC point of connection on the
load side of the meter in the service disconnect enclosure in a supply side
connected PV system. 

 

250.30 Informational Note 1 reads: "An alternate ac power source, such as an
on-site generator, is not a separately derived system if the grounded
conductor is solidly interconnected to a service-supplied system grounded
conductor."   I believe a  PV system meets that description as the Neutral
stays connected at all times. 

 

My interpretation is that a standard net-metered PV system is therefore not
a separately derived system and the Neutral should not have a bonding jumper
to equipment ground in the Fused Disconnect.

 

Is this the correct interpretation?

 

David Palumbo

Independent Power LLC 

462 Solar Way Drive

Hyde Park, VT 05655

www.independentpowerllc.com 

NABCEP Certified PV Installer

Vermont Solar Partner

24 Years Experience, (802) 888-7194 

 

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