The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
10/24/16 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
HotLine1 7
ghost307 7
renosteinke 6
Potseal 4
Who's Online
0 registered (), 66 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#92567 - 03/26/05 10:23 AM AFCI
watersparkfalls Offline

Registered: 03/08/05
Posts: 210
Loc: Washington...Not DC
would an AFI work, if you had a back up power (5kw generator) feeding the breaker?

The breaker would be fed through a manual transfer switch, one side of the switch from
the AFI and the other from the generator.

It seems like the breaker would be an intergal part of the neutral since the banch circuit is landed in it and then bonded to the nutral busbar. And if the breaker is de-energized would it be an open circuit when the generator tries to feed it?

Any thoughts would be appreciated.

2014 / 2011 NEC & Related Books and Study Guides
#92568 - 03/27/05 09:42 AM Re: AFCI
tdhorne Offline

Registered: 03/22/01
Posts: 344
Loc: Maryland, USA
Use a double pole double throw transfer switch and it will be a non issue. If you transfer both the neutral and the hot the generator functions as a derived system. The easiest way to provide grounding will depend on how your generator is configured. If its neutral is bonded to the frame then you will need to run a Grounding Electrode Conductor (GEC) from your house's grounding electrode system to the bonding lug on your generator. If the generator neutral is not bonded to the generator frame then it will be easier to bond the neutral to ground in the transfer switch and run the GEC to the grounding electrode system from the switch's enclosure.
Tom H
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison

#92569 - 03/27/05 06:10 PM Re: AFCI
pdh Offline

Registered: 01/20/05
Posts: 354
How do you intend to comply with 210.12 during the time the generator is supplying power?

#92570 - 03/27/05 09:55 PM Re: AFCI
watersparkfalls Offline

Registered: 03/08/05
Posts: 210
Loc: Washington...Not DC
well 702.3 is specific.
the only thing left is to get a blessing from the "ahj" and filling out a proposal to the panel for an exception here.


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals