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techntrek
mastr;9339 wrote:
If the set will do 2 wire start, a DPDT center off switch could allow selecting automatic, run or stop (also disables auto start).


If its like mine, you only have to switch the on/off line. If you want auto you just set the switch on the genset to auto and then control on/off from the remote switch. I did not need to extend the wires switched on the auto side.
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genme
Thank to everyone for their help!
techntrek;9343 wrote:
If its like mine, you only have to switch the on/off line. If you want auto you just set the switch on the genset to auto and then control on/off from the remote switch. I did not need to extend the wires switched on the auto side.
That would be great. I'll check with Generac on the two wire start instructions and functionality.

I'll was thinking of having load break rated utility and generator disconnects installed (although I will turn off large loads before throwing the disconnects.) Any opinions on whether these disconnect should be fused or not?
Model 5875, Nexus controller, 999cc Engine, 20kW LP, 2011
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mastr
genme;9345 wrote:
...I'll was thinking of having load break rated utility and generator disconnects installed...Any opinions on whether these disconnect should be fused or not?


I don't like fuses- because I don't like looking for spare fuses in the dark.
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bronco
If you can't get the info on the 2 wire start let me know and I'll get them to you.
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techntrek
If you are talking a remotely-activated load break disconnect I'm betting it has an internal fuse or breaker for the solenoid. The load input will be protected by the circuit breaker on the genset. But if you are handy making the modifications I mentioned above will do the same thing for free.

You don't need one for the utility, the only reason for one is to take the load off the genset so it can cool down before shutdown.

If you are looking at a manual load break, the circuit breakers on the genset panel will do the same thing for free, too. If you plan on installing it away from the genset panel so it is in a more accessible location you'll spend big bucks running thick copper there and back. It will need to be much bigger than your existing copper to handle the full amperage over a long run.
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genme
Thanks bronco. I found this thread which includes some of your information on the 2 wire start: [url]http://zillerstore.com/forums/showthread.php?t=1271[/url]

techntrek, a manual break is fine. It would be installed next to the transfer switch (so not much more wire.)

Thanks again to everyone for your continued assistance!
Model 5875, Nexus controller, 999cc Engine, 20kW LP, 2011
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techntrek
Then I'm completely stumped why you would install one when flipping a dozen breakers a foot away does the same thing.
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genme
techntrek;9375 wrote:
Then I'm completely stumped why you would install one when flipping a dozen breakers a foot away does the same thing.
39 breakers if I remember correctly (44 less 5 double poles.) Unfortunately, our service rated entrance switch doesn't have a generator disconnect breaker built in. I could throw the main breaker in the distribution panel, but that would not cut generator power to the transfer switch. Is this an issue?

I'm hoping the unloading/loading issue may be taken care of if the 2 wire start maintains the sequence of operations for starting and shutting down the generator (as was mentioned in the other thread I linked to.) I'm trying to confirm everything with Generac, and I will test everything with my system after the electrical is connected, and post the results here.

From other posts, it appears that the 2 wire start has been out for several years for different models. It seems strange to me that there is no readily available documentation on it from Generac.
Model 5875, Nexus controller, 999cc Engine, 20kW LP, 2011
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genme
I see no connection point for the 2 wire start on our nexus air-cooled generator. Just thought I'd post in case anyone had any ideas.

I had the control panel open and observed it from all angles. If it's there, I missed it.
Model 5875, Nexus controller, 999cc Engine, 20kW LP, 2011
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douglas123
Your unit does not have the basic 2-wire start 178&183. The owners manual is not real clear but open to the page showing connections between generator and transfer switch. N1 yellow, N2 yellow 23 white,194 red,T1 blue. You think you are confused. try being a service tech on a new model and ask myself what rocket scientist wrote this manual. Your transfer switch owners manual give a clearer picture
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