Different Systems (Was Conduit inside the tracker pole) [RE-wrenches]

[Richard L Ratico]

John:

As Allan and you point out, in most situations 2002 NEC 300.3(C)(1) applies. 
However, when the DC circuits in question are photovoltaic source or
photovoltaic output circuits, NEC 690.4(B) applies.

-2002 NEC 690.4(B): Conductors of Different Systems. Photovoltaic source
circuits and photovoltaic output circuits shall not be contained in the same
raceway, cable tray, cable, outlet box, junction box, or similar fitting as
feeders or branch circuits of other systems, unless the conductors of the
different system are separated by a partition or are connected together.

Dick
Solarwind Electric
Bradford, VT 05033 

--- You wrote:
Allan:
 
You are correct . The code allows ac and dc in the same conduit or
raceway but...
1) The insulation on all conductors must be rated for the highest
voltage in the raceway.
Normally not a problem since most power wire is 600 V rated.  Some
control cables can be only 300 V rated.
 
2) You can not terminate the ac and dc in the same conduit or raceway
without a mechanical barrier.
No split bolts, taps, or splices if you mix ac and dc.
 
If you have any questions or if I can be of any further assistance,
please to not hesitate to contact me.
 
Best Regards,
 
John Berdner
--- end of quote ---

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