[RE-wrenches] AC/DC in Same Trench?

[jerrysgarage01]

WrenchesAs a matter of practice, we always use conduite, never direct burial, always copper too, we have had AC and DC in the same trench but with space seperating the conduits and have had no issues with noise or JHA. As a safety issue we would not risk direct burial of high voltage DC regardless. Jerry


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-------- Original message --------
From: Ray Walters <ray at solarray.com> 
Date: 12/28/16  12:00 PM  (GMT-10:00) 
To: RE-wrenches <re-wrenches at lists.re-wrenches.org> 
Subject: Re: [RE-wrenches] AC/DC in Same Trench? 


    Also, you didn't specify, but AC and DC are specifically allowed in
    the same raceway per 300.3(C)(1).  Only If the DC circuits are PV
    source or output circuits, then 690.31(B) prevails, which says they
    can't share a raceway.  But again, as Chris mentions, this
    restriction does not apply to direct burial.  

    R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer, 
Licensed Master Electrician
Solar Design Engineer
303 505-8760
    On 12/28/2016 12:58 PM, Chris Mason
      wrote:

    
    
      No problem with same trench, the requirements are
        that they are not in the same raceway.
      

        On Wed, Dec 28, 2016 at 1:37 PM, Corey
          Shalanski <corey at joule-energy.com>
          wrote:

          
            For some upcoming utility-scale projects our
              design team is wondering about placing direct-bury AC and
              DC circuits in the same trench.
              - Firstly, is this even Code-permissible?
              - Secondly, are there any common sense reasons
                (induced voltage/signal interference/etc) for not doing
                this?
              

              
              Thanks,
              Corey Shalanski
              Joule Energy
              New Orleans, LA
            
            

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        -- 

        
          Chris Mason
            
              NABCEP Certified Solar PV
                  Installer™
              Solar Design Engineer
              Generac Generators Industrial
                  technician
            
            

              
            www.cometsolar.com
            264.235.5670
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            Skype: netconcepts
          
        
      
      

      
      

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