Installation details [RE-wrenches]

[Electrical Energy]

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Here is the Code quote.  Below it is the discussion from the explanatory 
section of the NEC Handbook.  The explanation really clears things up.  It 
seems Jay is doing it right.

In a system not solar photovoltaic, conductors don't need separation, as 
long as the system is under 600 volts and the insulation of all conductors 
is adequate for the conductor of the highest voltage.

I'd also think that battery powered DC circuits could be in the same switch 
boxes as AC from the inverter.  Would the power system supplied by the 
solar voltaic system be subject to the rules of photovoltaic systems?


CODE QUOTE
(C) Conductors of Different Systems.
(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).
FPN:See 725.55(A) for Class 2 and Class 3 circuit conductors.


Explanitory remarks from the NEC Handbook.
Section 300.3(C)(1) makes it clear that it is the maximum circuit voltage 
in the raceway, not the maximum insulation voltage rating of the conductors 
in the raceway, that determines the minimum voltage rating required for the 
insulation of conductors for systems of 600 volts or less.
The conductors of a 3-phase, 4-wire, 208Y/120-volt ac circuit; a 3-phase, 
4-wire, 480Y/277-volt ac circuit; and a 3-wire, 120/240-volt dc circuit may 
occupy the same equipment wiring enclosure, cable, or raceway if all of the 
conductors are insulated for the maximum circuit voltage of any conductor. 
In this case, the maximum circuit voltage would be 480 volts, and 600-volt 
insulation would be suitable for all of the conductors.
If a 2-wire, 120-volt circuit is included in the same raceway with a 
3-wire, 120/240-volt circuit having 600-volt conductors, then the 2-wire, 
120-volt circuit conductors could use 300-volt insulation because the 
maximum circuit voltage is only 240 volts.

Section 690.4(B) prohibits the location of solar photovoltaic circuits 
within the same enclosure as conductors of other systems unless the 
conductors are separated by a partition or are connected together.

Section 725.55(A) prohibits Class 2 and Class 3 circuit conductors from 
occupying the same enclosure, cable, or raceway as Class 1, electric light, 
and power conductors, unless specifically permitted in 725.55(B) through (J).
(At 08:51 AM 11/27/2002 -0800, you wrote:
>Hi Bob-O,
>
>I've run AC and DC in the same gutter, code approved.
>
>I interpret the " must be seperated by a partition or are connected 
>together" to
>mean that if I wire tie the AC side to each other and the DC side to each 
>other
>they are connected together.
>
>I for one will continue to use the gutter system unless there is clear 
>reason not
>too.
>
>Thanks ,
>
>jay
>
>Peltz Power
>
>
>
>"Bob-O Schultze, Electron Connection" wrote:
>
> > Max,
> > Really good point. I've put them both in the same gutter in a
> > multiple inverter system before with no beef from the inspector, but
> > the 690 part forbidding PV input and output circuits in the same
> > chase can be interpreted to disallow that practice. Personally, I've
> > always read it as not wanting DC output circuits in the same run as
> > PV inputs which would be at a somewhat higher voltage. It's ANOTHER
> > of those goofy 690 rules that are ill defined and unsupported by
> > facts.
> > BOb-O
> >
> > >Graham, I was looking at the layout for the 2500's. It appears that 
> they are
> > >mixing the ac / dc wiring in the gutters. Do you know if they had barriers
> > >in the gutter, or do they occupy the same space?? I have had 
> discussion with
> > >inspectors over the issue of a gutter below the inverter that takes the
> > >ac/dc feeds in and out of the inverter. The wires are in the same 
> space once
> > >they enter the inverter enclousure so why not allow  a gutter below the
> > >inverter that makes a convienient and clean way to feed both ac and dc 
> from
> > >the conduit runs into the inverter?? This works well as in this 
> install with
> > >multiple inverters.......
> >
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