Yet again this "PV wire" thing rears its head.
For our PV systems using transformerless (TL) inverters, our standard practice has been to use double-insulated conductors for all DC circuits coming into the TL inverter(s), which we believe represents the best practice. However, there doesn't appear to be any requirement stated in the code that states the need to use double-insulated conductors for DC circuits and TL inverters. So I'm thinking, why pay the extra expense for the double-insulated wire when single-insulated wire may suffice. Anyone know of anything written somewhere that requires the use of double-insulated conductors in TL DC circuits? Thanks, marco
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