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

[Ray Walters]

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 <mailto: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™
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