Hi Marco, It goes back to 690.35(D). Transformerless inverters are usually ungrounded PV systems, so the wire must bein raceways, or it must be PV wire.
There are a few exceptions, the SMA CP-US inverters can have a grounded conductor, but you must have a floating AC neutral. And the Solarons gets away with it since the GFDI is bonded throught the AC neutral when in operation. Jun 2013 07:09:55 -1000 From: "Marco Mangelsdorf" <[email protected]> To: "'RE-wrenches'" <[email protected]> Subject: [RE-wrenches] double insulated wire Message-ID: <007e01ce7422$519df6e0$f4d9e4a0$@com> Content-Type: text/plain; charset="us-ascii" I'm kinda confused. With more transformerless inverters on the market (e.g., SMA and Power-One), it's not clear to me if double insulated wiring needs to be used all the way from each series string to their respective inverter. We've been installing the P1 3-6 kW TL inverters and there's no apparent mention of needing to use such conductors, yet I remember needing to do so when I installed a number of the 8, 9 and 10 kW SMA TL inverters. Thanks, marco
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