[RE-wrenches] double insulated wire

[Steven Lawrence]

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" <marco at pvthawaii.com>
To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
Subject: [RE-wrenches] double insulated wire
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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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