Installation details [RE-wrenches]

Electrical Energy solar at eagle-access.net
Wed Nov 27 17:29:44 PST 2002


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I forgot to mention that the neutrals of the different systems need to have 
differentiating markings.


-Drake

At 06:15 PM 11/27/2002 -0700, you wrote:
>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:

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