[RE-wrenches] "PV wire"

[Marco Mangelsdorf]

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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