600 VDC switches [RE-wrenches]

[Bill Brooks]

The "readily accessible" requirement for the disconnect in the 2002 code is
silly. That whole section needs a major rewrite. It was crammed down the
code making panel's throat by some utility folks (expletive deleted) on the
east coast (New Jersey).

Bill.


-----Original Message-----
From: matthew tritt [mailto:solarone at charter.net]
Sent: Friday, September 20, 2002 10:29 AM
To: RE-wrenches at topica.com
Subject: Re: 600 VDC switches [RE-wrenches]


Bill,

I assume they must be referring to flat or, at least, accessible roofs. How
would you do this with a solar integrated (PVL) system? Does someone climb a
ladder to disconnect or what?

Matt
----- Original Message -----
From: "Bill Brooks" <billb at endecon.com>
To: <RE-wrenches at topica.com>
Sent: Friday, September 20, 2002 10:18 AM
Subject: RE: 600 VDC switches [RE-wrenches]


> Chris (and John B.),
>
> Unless this is an ungrounded system (which it isn't), the code will not
> allow you to break the grounded conductor as John Berdner pointed out. So
> use the disconnect as a single pole disconnect and forget about the
unused,
> non-seriesed pole.
>
> This is a very common mistake with these disconnects primarily because the
> manufacturer's information on the two poles in series is very poor.
>
> John,
>
> I know you have been working on some options for 600 Vdc disconnect. Do
you
> have any new information or products that might work better? Incidentally,
> there is a move afoot from the Fire Marshalls to require roof-mounted
> disconnects for system that have DC wiring internal to the building. This
is
> already a code requirement in the 2002 code, but it is rarely enforced. If
> we are going to put 600Vdc disconnects on roofs, they need to be compact.
> The Outback box is nice and low profile, do you have any other
suggestions?
>
> Bill.
>
>
> -----Original Message-----
> From: Chris Worcester [mailto:chris at solarwindworks.com]
> Sent: Friday, September 20, 2002 8:37 AM
> To: RE-wrenches at topica.com
> Subject: SPAM: RE: 600 VDC switches [RE-wrenches]
>
>
> Hi Wrenches,
>
> I have a GE safety switch (model GEDTH2261RDC) rated at 600V DC 30A fused
> disconnect to share info on. I was concerned as to it's application as one
> pole, out of 3, is jumped to another at the factory, and the 3rd pole is
not
> jumped. I found 12 Amp 600V DC rated class R fuses that fit. According to
> the internal schematic this is a 2 pole, line to load disconnect. Because
of
> the difference in the way the poles are wired we had a lengthy debate as
to
> how to use this device at the 600 V rating. I called GE and got through to
> an engineer that informed me, after much questioning, that this is a
single
> circuit disconnect for DC applications, in other words; the positive is
> landed on the jumped pole, for a double contact break, and the negative of
> the same circuit is landed on the single pole. In this way the single
> circuit is opened without a DC arc. I hope this helps.
>
> Chris Worcester
> www.solarwindworks.com
> chris at solarwindworks.com
> Toll Free: 877-682-4503 Fax: 530-582-4603
> "Proven energy solutions"
>
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