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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