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

[Nick Lucchese]

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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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