600 VDC switches [RE-wrenches]

[Bill Brooks]

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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