[RE-wrenches] Grounding Separately Derived AC System

[Jesse Dahl]

I agree and read it the same way. Not a separately derived system. 

Jesse 

Sent from my iPhone

On Jan 23, 2012, at 7:13 PM, "Dave Palumbo" <dave at independentpowerllc.com> wrote:

> 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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