Hey all,
Been re-reading my solar codes lately, and I can't get my brain around NEC 2011 100.1's definition of 'Separately Derived System'. It reads:
"A premises wiring system whose power is derived from a source of electric energy or equipment other than a service. Such systems have no direct connection from circuit conductors of one system to circuit conductors of another system, other than connections through the earth, metal enclosures, metallic raceways, or equipment grounding conductors"
So what's a 'direct connection'? Does wiring through a solar backfeed breaker count as a direct connection to circuit wiring? If that's so, basically no PV array is an SDS unless it is fully grid-independent, which would seem not to be a useful distinction to even bother making. Is there another way to read this?
Thanks all,
Bret
Source: http://forums.mikeholt.com/showthread.php?t=151239
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