wire color [RE-wrenches]

[Phil Undercuffler]

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Ungrounded systems are allowed, but only if you put disconnects in all
ungrounded conductors.  Since this instantly doubles the number of
fuses/breakers required, this exception is rarely used.

However, in my previous employment in the field I often used a two pole
disconnect on PV direct water pumping systems, as it is really hard to find
single pole disconnects.  This allowed me to float the negative legally, and
possibly help with surge protection.

Since we carried red, white and black USE-2 on the service truck, I did like
Todd and used white and red for grounded systems and red and black for
floating systems.  Helps eliminate the OOPS factor.

Phil Undercuffler
Dankoff Solar

on 1/17/05 1:10 PM, Marco Mangelsdorf at marco at pvthawaii.com wrote:
> Ray,
> Either I'm missing something here or am really lame.  Under what
> circumstances are your code-compliant systems ungrounded?  I thought that in
> the Land of the NEC ALL PV systems (other than, say, modules on the roof of
> an RV) must have the negative conductor grounded to ground at some point in
> the system.
> 
> marco
> ProVision
> 
> I use red for positive that's legal for all
> instances. We use black for neg for lower voltage and when the negative is
> left ungrounded. If it is an ungrounded conductor then it is NOT required
> to be  white or grey. It should be black.
> If its grounded we use white, or black with white tape stripes. I think
> black wire with a white stripe might be a good compromise. It is available
> in automotive wire.
> 
> Ray

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