Installation details [RE-wrenches]
Electrical Energy
solar at eagle-access.net
Wed Nov 27 17:29:44 PST 2002
<x-flowed>
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:
- - - -
To send a message: RE-wrenches at topica.com
Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
Check out participant bios: www.mrsharkey.com/wrenches/index.html
Hosted by Home Power magazine
Moderator: michael.welch at homepower.com
==^================================================================
This email was sent to: michael.welch at homepower.com
EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com
T O P I C A -- Register now to manage your mail!
http://www.topica.com/partner/tag02/register
==^================================================================
</x-flowed>
More information about the RE-wrenches
mailing list