Posted by Dave on April 11, 2007, 6:17 pm
The vast majority of grid tied PV systems (at least in the US) I know are
negative grounded systems.
I just ran across a vendor who offers positive ground systems and I'd like
to know why positive ground systems are sometimes used and what are the
pros and cons for their application. I would appreciate any information
folks might share on this subject.
Dave
Posted by Solar Flaire on April 11, 2007, 8:03 pm
If one conductor is not grounded then the system needs to have dual
overcurrent protection and ground detectors.
"Negative" is usually grounded because the word sounds similar to
"neutral". Positive is fine also and no reason not to be grounded
except for confusing somebdy, perhaps?
> The vast majority of grid tied PV systems (at least in the US) I
> know are negative grounded systems.
> I just ran across a vendor who offers positive ground systems and
> I'd like to know why positive ground systems are sometimes used and
> what are the pros and cons for their application. I would
> appreciate any information folks might share on this subject.
> Dave
>
Posted by sylvan butler on April 12, 2007, 2:05 pm
On Wed, 11 Apr 2007 19:03:32 -0500, Solar Flaire
> If one conductor is not grounded then the system needs to have dual
> overcurrent protection and ground detectors.
In the U.S. "need" is defined by the NEC. In jurisdictions where that
does not apply, what is the "need" for ground detectors or dual
overcurrent protection?
sdb
--
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Posted by Solar Flaire on April 12, 2007, 6:24 pm
I would be quite certain the samew thing applies to any decent
electrical safety code. This is also a requirement in the Canadian
Electrical Code.
Is that what you are asking?
> On Wed, 11 Apr 2007 19:03:32 -0500, Solar Flaire
>> If one conductor is not grounded then the system needs to have dual
>> overcurrent protection and ground detectors.
> In the U.S. "need" is defined by the NEC. In jurisdictions where
> that
> does not apply, what is the "need" for ground detectors or dual
> overcurrent protection?
> sdb
> --
> What's seen on your screen? http://pcscreenwatch.com
> sdbuse1 on mailhost bigfoot.com
Posted by Duane C. Johnson on April 12, 2007, 5:57 pm
Hi Solar;
> I would be quite certain the same thing applies to
> any decent electrical safety code. This is also a
> requirement in the Canadian Electrical Code.
Please show us where the Canadian Electrical Code
requires that the positive conductor be grounded in
a solar system.
> Is that what you are asking?
Duane
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> know are negative grounded systems.
> I just ran across a vendor who offers positive ground systems and
> I'd like to know why positive ground systems are sometimes used and
> what are the pros and cons for their application. I would
> appreciate any information folks might share on this subject.
> Dave
>