[RE-wrenches] Tranformless inverter

[Glenn Burt]

Also be aware of the hand calculations required for computing conduit fill
with the new PV wire, due to its insulation thickness, and possibly
different sized cable management clips (may only be suitable for USE-2),
liquid tight cord grips (if used at conduit transitions on rooftops), etc. 

 

-Glenn Burt

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Marco
Mangelsdorf
Sent: Friday, October 01, 2010 2:44 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Tranformless inverter

 

Ah so..double-insulated is the key.  I understand, Master.

 

I will get my peeps on it.

 

marco

 

It has to do with the development of a "double-insulated" conductor needed
for ungrounded systems. PV Wire is double-insulated while USE-2 is not
tested as double insulated. It is analogous to double-insulated tools in the
U.S. that do not require a ground wire.

 

Bill.

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Marco
Mangelsdorf
Sent: Friday, October 01, 2010 11:09 AM
To: 'RE-wrenches'
Subject: [RE-wrenches] Tranformless inverter

 

Bill B. wrote the following:

 

Ungrounding the array requires additional fusing and disconnects, but the
most significant difference is that the module wiring and all external cable
must be PV Wire/Cable. Therefore only modules with PV Wire/Cable can be used
in these systems. You must confirm from the manufacturer that they have made
the switch. Hopefully all manufacturers will be installing PV Wire/Cable
soon so that this will not be a problem anymore.

 

--My question: why is the standard USE-2 wire not acceptable any mo'?

 

marco

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