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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.<br>
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Check it out.<br>
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On 4/11/2012 8:41 AM, Aladdin Solar wrote:
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<div><font face="Arial" size="2">I meant the question largely to
be a generic one but I can give you an example:</font></div>
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<div><font face="Arial" size="2">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.</font></div>
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<div><font face="Arial" size="2">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.</font></div>
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<div><font face="Arial" size="2">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?</font>
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