[RE-wrenches] "PV wire"

[Marco Mangelsdorf]

Seems to me that the best practice for TL inverters is to use
double-insulated conductors from the array string(s) to the combiner (if
used) to the inverter.

 

That said, there doesn't appear to be any written requirement in the NEC to
use double-jacketed conductors.  So as long at the conductor is duly listed
as "PV wire," it's OK to use in DC circuits with TL inverters.

 

marco

 

 

HI Marco

 

I think there has been a lot of bad/old information about PV vs double
insulated wire.

However now it only listed as PV wire.

 

690.35 D (3)

 

jay

 

peltz power

 

 

On Oct 23, 2014, at 2:29 PM, Marco Mangelsdorf wrote:





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

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20141023/2a662a7e/attachment-0002.html>