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

[Matt Lafferty]

Wrenches:

A glimmer of sunshine in Brother Bill's helpful recital!  I have been
wandering in the wilderness for forty years!  Well, almost forty...

Thanks for digging this out Bill!

Humble Sun Worshipper

-Matt Lafferty
pvpro at attbi.com

Matt Lafferty wrote:

> Mixing of "separately derived" power sources within a single raceway,
> without a physical separation, to my knowledge has always been prohibited.

Brother Bill wrote:

> The chapter and verse of the requirement is in Article 690.4(b)of the holy
> NEC:
>
> (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 systems
> are separated by a partition or are connected together.
>
> Here endeth the first lesson.
>
> This doth not refer to DC and AC systems in general. Article 300.3(c)(1)
> doth say:
>
> (1) 600 Volts, Nominal, or Less.
>
> Conductors of circuits rated 600 volts, nominal, or less, ac circuits, and
> dc circuits shall be permitted to occupy the same equipment wiring
> enclosure, cable, or raceway. All conductors shall have an
> insulation rating equal to at least the maximum circuit voltage
> applied to any conductor within the enclosure, cable, or
> raceway.
>
> Exception: For solar photovoltaic systems in accordance with 690.4(B).
>

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