With electrical connections in NEMA 3R boxes, I've never had an
inspector have a problem with non wet location equipment. This
includes NEMA 3R service equipment with breakers, bus bars and other
equipment which must stay dry. The 3R does not use a gasket like the
4X, but is reliant on the
Friends:
I have had plan checkers insist I use wet rated wire on rooftops even
though the wire was in either liquid tight or EMT with raintight
connectors. I did not need to dispute this because we had specified THHN
wire that is also rated THWN for wet locations. This discussion makes me
William, the only explanation that I have found for using THWN-2 in conduit run through the attic is that during the day as the temperature in the attic increases, the air in the conduit expands, at night the opposite effecthappens, the temperature in the attic decreases and the volume of air in
Wrenches,
We have been asked for a design for an off-grid system to reduce
generator runtime for a mountain resort. Initial projections
(consumption measurement results not yet available) suggest 15-20 kW
of PV and around 30 kW of inverter capacity. However, the
Do they actually have 208v loads? If not, replace with 120/240 panel. Just a
thought... Although a transformer would be required to use an existing 208v
generator.
Jason Szumlanski
On Oct 21, 2011, at 11:17 AM, Allan Sindelar al...@positiveenergysolar.com
wrote:
Wrenches,
We have been
That has been my experience as well, Drake. Typically in these Enphase
installations the 3R rated box is mounted under the last panel in the
string and attached to the rack. This makes it very unlikely to ever see
wet conditions when properly installed. As we all know, ultimately the
Glen,
It's a little interesting to contrast: 300.5 Underground Installations.
Shall be considered wet locations.
Conductors shall be listed for wet locations. Connections shall be
approved for wet locations. Where the code is quite direct about the
requirement for connections. I'm
Allan:
Also, you might consider using six to nine Schneider/Xantrex XW6048
inverters, or six to nine Outback Radian GS8048 inverters, in a 3-phase
configuration, with a common battery bank.
Also, Schneider/Xantrex has an 80A 600V charge controller that may be
advantageous depending on the
Gary,
I was surprised by this information, as I had presumed that both
units were for single-phase only. So I checked.
Mary Raub in tech support at Outback told me that the Radian works
only in 120/240 single-phase, although they are stackable in
parallel.
Hey Allan,
SMA is about to release a 6 KW version of the 5 KW SI if that figures in
your considerations at all. And of course the advantage of the SI is
you can feed power into the micro-grid anywhere along the backbone
without AC coupling relays in true off-grid mode. But to stack 6 you'd
Alan: Thanks for setting me straight about 3-phasing the Outback Radian
- I was not aware they are limited to parallel single phase applications.
Regards,
Gary Willett
On 10/21/2011 15:29, Allan Sindelar wrote:
Gary,
I was surprised by this information, as I had presumed that both units
I started using the wet rated wire nuts, because I've found some
corrosion in old connectors in outdoor boxes. BTW, why don't you
like the goo filled wire nuts? They seem a decent and cost effective
solution.
I agree with your idea that condensation and moisture buildup
Ray/Jamie:
I think that a 3R installation may be superior to a Nema 4. With a 3R any
condensation build up can drain.
Thanks to all of you for another round of thoughtful, well informed,
technical discussion. This forum is very helpful and I really feel a lot
of camaraderie even though we
Friends:
I posted a question here about three weeks ago on the subject of connecting
a dual SW inverter stack to a three phase generator. I have learned a lot
since then. Here are the most important points:
Most large, three phase generators are allegedly field convertible to be
either
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