600 VDC switches [RE-wrenches]

Fri Sep 20 17:38:32 PDT 2002

Wrenches:

As an alternative how about metallic conduit inside the building
envelope.

If you have any questions, or if I can be of any further assistance,
please do not hesitate to contact me.

Best Regards,

John Berdner

SMA America, Inc.
20830 Red Dog Road
Grass Valley, CA  95945
530.273.4595 (voice)
530.274.7271 (fax) 

-----Original Message-----
From: Bill Brooks [mailto:billb at endecon.com] 
Sent: Friday, September 20, 2002 10:18 AM
To: RE-wrenches at topica.com
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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