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Thread: Romex for DC run

  1. #1
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    Romex for DC run

    Legal or not? Code reference if applicable.


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  2. #2
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    Legal,no prohibition.

    Get the NM cable from Canada; they have it with red and black, no white.

    I call it DC Romex.



    See: 210.5(C)(2), 250.162 and 250.164, 410.134, and solar if applicable.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

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    Quote Originally Posted by LarryFine View Post
    Legal,no prohibition.

    Get the NM cable from Canada; they have it with red and black, no white.

    I call it DC Romex.



    See: 210.5(C)(2), 250.162 and 250.164, 410.134, and solar if applicable.
    How would you label it as a photovoltaic source?


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    Quote Originally Posted by Dbarrett View Post
    How would you label it as a photovoltaic source?
    Start at 690.31.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

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    Quote Originally Posted by LarryFine View Post
    Start at 690.31.
    690.31 Methods Permitted.

    (A) Wiring Systems. All raceway and cable wiring methods included in this Code, other wiring systems and fittings specifically listed for use on PV arrays, and wiring as part of a listed system shall be permitted. Where wiring devices with integral enclosures are used, sufficient length of cable shall be provided to facilitate replacement.

    Where PV source and output circuits operating at voltages greater than 30 volts are installed in readily accessible locations, circuit conductors shall be guarded or installed in Type MC cable or in raceway. For ambient temperatures exceeding 30°C (86°F), conductor ampacities shall be corrected in accordance with Table 690.31(A).

    Sorry, I’m not seeing the argument that nm is allowed. It says it needs to be guarded or in a raceway.


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    Not legal for a circuit connected directly to solar panels.

    Needs to be either:

    a) beyond the first readily accessible disconnecting means

    or, perhaps...

    b) a DC-to-DC converter output circuit, as opposed to a PV source or output circuit

  7. #7
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    Quote Originally Posted by Dbarrett View Post
    Sorry, I’m not seeing the argument that nm is allowed. It says it needs to be guarded or in a raceway.
    690.31 Methods Permitted.

    (A) Wiring Systems. All raceway and cable wiring methods included in this Code, other wiring systems and fittings specifically listed for use on PV arrays, and wiring as part of a listed system shall be permitted. Where wiring devices with integral enclosures are used, sufficient length of cable shall be provided to facilitate replacement.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  8. #8
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    Look at 690.31(G).

    There was a long standing requirement for metal raceways for PV source and output circuits, only slightly relaxed in recent code cycles.

  9. #9
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    Quote Originally Posted by Dbarrett View Post
    Legal or not? Code reference if applicable.


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    Not around here, anyway. DC needs to be in a metal raceway.

  10. #10
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    We are still in the last decade code wise, but on the interior of buildings, generated dc in metal conduits. On the exterior it would be fine except it wouldn't because it's nm cable..... Probably UF could be used on the exterior though...... yuck......
    85deg. an Sunny today.

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