Xantrex PV30208 Install in LA [RE-wrenches]

[peter.parrish at calsolareng.com]

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We recently finished installation of a 36kW-STC grid-tied PV system in 
the City of LA and encountered some difficulty with our Building and 
Safety inspector wrt the Xantrex PV30208 with 208Y/480Y isolation 
transformer.

We purchased a "grid-tied kit" from Xantrex which consisted of a PV 
combiner box, DC disconnect, inverter, transormer and AC disconnect.

It was our understanding that the inverter/transformer was a single 
power source and had been tested to UL1741. We provided a continuous 
ground from the inverter chassis ground stud, to aisolation tranformer 
chassis ground to a cold water pipe; and we furnished the wiring between 
the inverter and transformer via a short section of 1-1/4" EMT. 

Our inspector wanted to treat the inverter and isolation transformer as 
seperately derived power sources with separate grounds to a cold-water 
pipe and an additional fusible disconnect between the two.

I have spoken to the Xantrex Project (Product) Engineer as well as the 
Manager, Quality Systems for the PV seriews inverters and they have 
provided documentation to support the contention that the inverter and 
transformer comprise a single "system kit" that has been tested and 
certified by UL to be in compliance with UL1741 as well as 
IEEE-929-2000.

I am prepared to do as the B&S inspector requires, but I would also like 
to know if anyone else has encountered this problem or a similar one in 
connection with the PV30208 inverter.

- Peter Parrish

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