AC/DC in the same conduit [RE-wrenches]

[Chris Worcester]

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Hi Nick,

Per code you need a min 1 gauge at 15kW 240V with 260' run, 2% voltage drop,
without knowing conduit fill or temp correction factors involved.

Sincerely,

Chris Worcester
Solar Wind Works
NABCEP Certified Solar PV InstallerT
USA Distributor of Proven Wind Turbines
Toll Free: 877-682-4503
Fax: 530-582-4603
www.solarwindworks.com
chris at solarwindworks.com
"Proven Energy Solutions"

-----Original Message-----
From: Nick Lucchese [mailto:nickl at sierrasolar.com]
Sent: Monday, June 20, 2005 12:22 PM
To: RE-wrenches at topica.com
Subject: AC/DC in the same conduit [RE-wrenches]


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Greetings Fellow Wrenches,
  Besides the code violation itself and all the implications of that I
was wondering exactly what sort of problems one would face with this
scenario. I was called last week out on a job to double check an
installation where the owner had not been impressed with his
installers work as well as program his inverters. What I found was
the main 72v run from a 2 kW array placed in the same conduit as the
AC wires as well as sharing a large jbox without any division between
the AC and DC before they split to the termination points in the PSAC
and PSDC. Obviously the customer is now educated that his installers
screwed this part of the installation up as well as the rest of the
growing list of issues and is debating whether or not to force the
installers to re-pull the wire, dig a second trench etc. He was
promised a code compliant installation even though the system will
not be inspected and may overlook the AC & DC in the same conduit if
he is truly convinced that he will not have any electrical issues
(noise, interference, etc) by this mistake. They will be re-pulling
260' of #6 to replace it with 1/0 and may not be able to fit the
larger wire in the conduit anyway. At this point they still insist #6
going 260' is sufficient wire for the output of a dual 3648 and a 15k
generator.

  Personally I know there are some interference and noise issues but
do not understand to what extent or other problems that may occur.
The customer is so frustrated he'll most likely be insisting that the
two be separated even if I tell him he won't have any electrical
issues. If anyone knows of a source where I can find some facts on
this issue for myself or any knowledge you would like to share it
would be much appreciated. By the way this installation was performed
by a C-10, not a C-46 or B.

As always thanks for the collective knowledge,

Nick A Lucchese

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