[RE-wrenches] GEC for Micro-Inverters and ACPV Modules

[Exeltech]

Hello Mark (and all),

Exeltech AC Module inverters do not have an external ground
connection because they are certified to UL1741 as grounded
through the utility ground.  Also, and because all DC wiring
is internal to the inverter, there is no requirement for DC
ground-fault or arc-fault circuitry in our inverters.

Installers don't need to attach a ground conductor to our
inverters.  That step has already been done internally for
you.

To attain this certification, and as part of the certification
to UL1741, our inverters had to conduct 40 amps through the
chassis and inverter wiring without damage or destruction to
the conductors and connectors.



Dan Lepinski, Senior Engineer
Exeltech / Exeltech Solar Products


--- On Mon, 1/14/13, Mark Frye <markf at berkeleysolar.com> wrote:

> From: Mark Frye <markf at berkeleysolar.com>
> Subject: [RE-wrenches] GEC for Micro-Inverters and ACPV Modules
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Monday, January 14, 2013, 5:31 PM
> Does anyone have the latest on the
> GEC for micro-inverters/ACPV issue?
> 
> I know it is still in NEC 2008 and I believe 2011 with plans
> to address it in 2014.
> 
> I am specifically interested in the issue of GEC means
> continues (irreversible splices) and the whole business of
> the DC side of these devices constituting a separately
> derived system.
> 
> Enphase technical support is fine if the micro inverter
> chasis is bonded to a EGC only, but they leave the lug on
> the chasis if you want/need to build a GEC.
> 
> SolarBridge (pre-assembled micro-inverter) seems to be
> devoid of a chasis lug and therefore by extension does
> not/can not had a GEC in the system.
> 
> Exeltech (integrated micro-inverter aka. ACPV) does not seem
> to have a lug on its chasis.
> 
> Has the industry pretty much moved to not requiring a GEC
> for these devices and if so, how are the AHJ taking it?
> 
> Thanks,
> Mark Frye
> Berkeley Solar Electric Systems
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