[RE-wrenches] Grid tied PV to subpanel on detached garage?

[Mark Frye]

Not necessarily. NEC 2008, 250.32 (B), Exception allows you to use the 
neutral conductor for existing structure so long as several requirements 
are met.

Check it out.

On 4/11/2012 8:41 AM, Aladdin Solar wrote:
> I meant the question largely to be a generic one but I can give you an 
> example:
> Buried conductors are 6AWG. No additional grounding conductor exists 
> between the main and detached building. As Brian Mehalic already 
> responded, the 60A subpanel would tough to deal with for inverter 
> sizing. Assume the AC disconnect is required near the main meter and 
> so would have to disconnect all circuits in the subpanel.
> So say we put a 50A main breaker in the 60A subpanel to allow a 
> Fronius IG 3.0 (3000 watt) and a string of 12 Sharp ND240s or similar.
> The PV ground would have to hit a ground rod at the garage and a 
> grounding conductor would need to be buried back for bonding at the 
> main building--right?
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