Portable Generator & Transfer Switch Compatibility

[SubLGT]

I am considering the purchase of a portable generator for emergency backup power. My local utility has approved the use of the GenerLink transfer switch.

http://www.generlink.com/generators_main.cfm

GenerLink has this note on their website:

"NOTE: Per the National Electric Code, all generators must have a "floating neutral " when used with the GenerLink Automatic Transfer Switch. Please refer to the generator operation manual for bonded neutral specifications."

If the portable generator (such as a Generac GP6500 or GP5500) has a "neutral bonded to ground", can it be converted to a "floating ground"?

 

[Rand]

http://www.generlink.com/CompatibleGenerator.pdf

first hit off google
http://home.earthlink.net/~kjvann/bonding.html

 

[SubLGT]

I am familiar with that list of compatible generators. But many of them are bonded neutral, which makes them incompatible with the GenerLink. Makes me wonder why they are even on the list.

I will have to call my local utility and find out whether local codes require a floating or bonded neutral on portable generators that are connected to the house electrical system.

From looking at the Generac Q&A, it is clear that they do not endorse changing the wiring on their generators. They would rather have the consumer buy a transfer switch that is compatible with bonded neutral.

From the other link you provided, there is this clarifying statement:
"...In conclusion, generators with a Bonded Neutral can be used with some types of two pole transfer switches and in stand alone use. Generators with floating neutral can not be used in stand alone use. And generators with full panel GFI require three pole transfer switches (switched neutral), or should be converted to floating neutral (with manfactures and Electricial Code Authrity approvial) and not used in stand alone use unless converted back…"

 

[SubLGT]

Here is a 5 page discussion about connecting a portable generator with a bonded neutral to a house electrical system:

http://forums.mikeholt.com/showthread.php?t=143277

I did not realize that there is some controversy in this area.

 

[Cup of Joe]

I used an interlock kit at my last house. Simple, effective and idiot proof. It's not possible to back feed down the power line with one.

http://www.interlockkit.com/

 

[SubLGT]

Originally Posted By: Cup of Joe
I used an interlock kit at my last house. Simple, effective and idiot proof. It's not possible to back feed down the power line with one.

http://www.interlockkit.com/


Interesting idea. So, for $150 you get a custom plate, but no back feed breaker, or receptacle, or extension cord? Seems over priced for just a plate.

 

[Cup of Joe]

I called a local electrician about getting 240V from my genset into the house and having a transfer switch. After discussing everything and checking the power consumption on my AC system he recommended the interlock. For $200 he installed the interlock, breakers, provided a 240V cable to run from the genset to the house and installed the 240 weather proof connector next to the power panel. It was money well spent honestly.