I'm kinda confused. With more transformerless inverters on the market
(e.g., SMA and Power-One), it's not clear to me if double insulated wiring
needs to be used all the way from each series string to their respective
inverter.
We've been installing the P1 3-6 kW TL inverters and there's no ap
We use PV Wire which is double insulated on the roof in free air and regular
THHN/TNWN for the run from the junction box back to the inverter (using no
white or gray wires of course).
Thanks,
Will
__
Will Wh
In ungrounded systems the PV wire requirement is to be used the whole DC circuit, so that is all the way to the inverter. 690.35 (D) is pretty clear . Because it is ungrounded the protection is the PV wire's fire rating and you don't get that with thhn/thwn.And of course Red for positive and black
Hi Marco,
It goes back to 690.35(D). Transformerless inverters are usually
ungrounded PV systems, so the wire must bein raceways, or it must be PV
wire.
There are a few exceptions, the SMA CP-US inverters can have a grounded
conductor, but you must have a floating AC neutral.
And the Solarons g
On 6/28/2013 11:47 AM,
a...@aramsolar.com wrote:
And of course Red for positive and black for negative.
Most building departments have not pick up on this yet.
But they will.
Aram
Where does "of course Red fo
690.35(D) does *not* require PV WIRE be used for the whole dc circuit.
You can use either: (quoting directly from 2008)
1) Nonmetallic jacketed multiconductor cables
2) Conductors installed in raceways, or
3) Conductors listed and identified as PV WIRE installed as exposed,
single conductors
S
As far as I understand it doesn't matter which color you use for which
conductor as long as it isn't white, gray, or green.
We have different crews using different colors but I think black and either
blue or red is the most common.
Thanks,
Will
From: re-wrenches-boun...@lists.re-wrenches.org
The convention of red for positive and black for negative is not just
automotive. It is also used by all battery based inverter manus, all
battery companies, and all multimeters.
John Wiles also agrees;
red = positive, black = negative for ungrounded systems
red = positive, white = negative fo
I have also seen the color convention that Ray enumerated becoming the
standard. The one variation (which I like) is to use the following for the
positively grounded legs of a bi-polar system:
Black = negative; GREY = positive
This can help prevent confusion between the two different grounded c
Respectfully:
My Fluke 87 does not use this convention. Black is labeled the COMMON terminal,
the red terminal is labeled according to function, not polarity. Battery based
inverter manus. using this convention typically provide BOS enclosures with OCP
for only one inverter conductor. This require
Richard, when you use your Fluke 87 to measure Vdc, black is negative,
red is positive. The black is labeled common because the meter can also
be used for current measurements. (I have a Fluke 89)
When you start using black wire for positive, it may be allowed by code,
but there just isn't a g
Dave,
To add to your point, the typical way to wire an ungrounded PV system is to
use modules with PV Wire-connect them to homeruns of PV Wire-then transition
at some point to standard wire in raceways. This means that the only change
from a wiring method point of view is to use PV Wire whereve
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