DC Disconnect required when entering house?

Z

Zee

Senior Member
Location
CA
Situation:
Panels on roof of home.
Rapid Shutdown Devices under panels. (APsmart RSD-D-20)
Conduit down exterior.
This conduit contains 4 strings of DC PV conductors and penetrates exterior wall into garage.
2 inverters in garage. (Growatt MIN 7600TL-XH-US, 7.6 kW - w/integrated DC Disco)
Inverter ouptut circuits run to service panel on exterior. (2 @ new 2p40A brkrs)
Inverter manual states Rapid Shutdown is triggered automatically by loss of AC power ( ie flipping the backfed breakers off)

Do i need a good old (manually operated, visible blade) DCD at point of penetration?

Is there still (from 20 years ago) a requirement to shut off DC conductors completely to 0V when entering a home - beyond the RSD requirements?


(FWIW, the service and DC penetration point are about 5 feet apart.)
 
Just to make it clear, there is no DC disconnect requirement when the DC conductors penetrate the building. RSD is not a disconnect and it does not satisfy any of the requirements of 690.13 or 690.15. RSD is just RSD, I would not want anyone to think it's a replacement for a disconnect.
 
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Was there ever a requirement for a DC disco at point of penetration to home?
If so, when did they get rid of it?
 
Zee said:
Was there ever a requirement for a DC disco at point of penetration to home?
If so, when did they get rid of it?
Click to expand...
I don't remember that.
You may be conflating that idea with the old requirement for metal raceways as far as the first disconnect. There was a time where if, say, you brought the DC from the roof in EMT on the exterior, and you put a disconnect at the bottom, you could then go out the back of the disconnect into the house with NM, because you had the disconnect. But that is slightly different. In any case that language is gone from the code now, and I think metal raceways are required for DC everywhere now.
 
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