[RE-wrenches] Backfeeding GFP devices

[Jesse Dahl]

I wondered the same thing.  If a person fed the secondary side of a transformer, and the primary side was fed from a service with GFP, would it mater if the GFP was able to be backfed?

Hope the question makes sense!

Jesse

Sent from my iPhone

On Mar 25, 2011, at 1:13 PM, "Glenn Burt" <glenn.burt at glbcc.com> wrote:

> We have had success in many cases, contacting the manufacturer of the
> installed breaker and asking if the device was suitable for backfeeding (ala
> solar). Some will certify that it is OK, some do not.
> 
> Glenn Burt
> 
> -----Original Message-----
> From: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Hans
> Frederickson
> Sent: Friday, March 25, 2011 1:16 PM
> To: 'RE-wrenches'
> Subject: [RE-wrenches] Backfeeding GFP devices
> 
> Wrenches,
> I'm looking at a fair number of school projects these days. So far, every
> school service I've looked at has a ground fault protection device at the
> main service disconnect. I just completed a 75kW school project where we did
> a line side tap. The panel gear was old, maybe 1960s Federal Pacific.
> Lately, I've been looking at schools with newer gear.
> 
> In SolarPro 2.4, the "Can We Land?" article mentions the possibility of
> getting a GFP device that is capable of being backfed. Has anyone seen or
> used such a device in conjunction with a big service? Are there any known
> manufacturers of GFP devices that are listed for backfeeding? For a current
> project, I would like to backfeed a GFP device that is controlling a 3000A
> switch on a 480V service.
> 
> Also, because I'm a curious person, I'm wondering if anyone has ever backfed
> a GFP device not listed for that use, perhaps without realizing it, and what
> the result was? 
> 
> Thanks,
> -Hans
> 
> Hans Frederickson
> Estimator / Project Manager
> Frederickson Electric, Inc.
> (360) 385-1395
> 
> 
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