Thanks, like that, it's simple, and does the job. :) I use a similar on 
the UPS for my standby generator, 120 VAC holds power to the power, the 
NC contact goes to battery backup.

Timothy J. Weber wrote:
> Carl Denk wrote:
>   
>> Reason for the light, there is a GFCI on that circuit, sometimes if 
>> there is lightening nearby, the breaker opens. There is also on the same 
>> breaker, 200 feet of underground plastic conduit with 120 VAC going to a 
>> natural gas well. The fence power is just an old 2 conductor 100 foot 
>> extension cord laying on the grass.
>>     
>
> A different solution that might be interesting - I use a buzzer wired to 
> a NC relay for notification when a GFCI opens on my sump pump.
>
> Circuit and images: <http://6sys.no-ip.info/~tjweber/gallery/sump>
> Far too many details: <http://timothyweber.org/taxonomy_menu/1/2/10>
>   
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