Genman4u
So client has 600 AMP service feeding the house , meter is about 100 ft from an old large house with a mess of about 4 electric panels and various sub panels in the cellar. The large primary panel in the cellar has a 600 AMP labelled disconnect on the top of it .

So we are proposing to put a 48 KW Liquid Cooled Generac Gen right next to the meter and mount a transfer switch next to the meter as well. In discussing this with our licensed electrician I was unclear if the transfer switch needs to be service rated in this case as I could not find a 600 AMP service rated switch from Generac. Anyone have any experience with these types of installations ? Many thanks.
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Peddler
In our county they won't let you do that unless you change the wire to the house to 4 conductor. Also they would make you install a 600 amp service rated switch in front of the ATS. You would be cheaper if you could to reconfigure inside the house with three 200 amp switches down stream from the 600 amp disconnect. I am not a code person though so not sure what is allowed in your area. Peddler
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MEC
Honestly I would consult with the AHJ before proceeding.

If it were me I would place the disconnect where it enters the house and the ATS next to it.
Making anything downstream four wire (don't know what is existing, so it may not be setup that way).
This setup may be cost prohibitive and you may want to install more than one ATS like Peddler mentioned.
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ceb58
Ether way its going to be a big rewire job. You have your choices to make but there must be a service disconnect before the ATS regardless of going with multiple ATSs or one 600 amp switch.
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MEC
Agreed
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BrentB
Seconded!
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Canada_Guy
Wow. 600 amps x 240 volt = 144 kw on a 48 kw. Do they have a grossly over sized service or will that generator be working beyond capacity?

Then again, I always thought it was a bit strange to hear of a 14 kw with a 200 amp xfer switch (yeah, I know, load shedding).
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MEC
I would say grossly oversized service.
What's the sq ft?
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Namvet34
Canada_Guy;35360 wrote:
Then again, I always thought it was a bit strange to hear of a 14 kw with a 200 amp xfer switch (yeah, I know, load shedding).


.

I have a 14kw unit installed at my house. My appliances are all gas, so no electric water heater, home heating system, dryer, oven or electric range. My appliance arrangement is virtually the same as it was at my previous house which had a 10kw generator. I don't have a means to measure amp load at my current home, but I did at my previous home and my average load was no more than about 5.5kw, not counting surges caused by the air conditioning system starting or sump pump surges, etc. The 10kw ran the entire house just fine.

With a 14kw unit, I actually feel that my unit is a bit over sized for my current needs, but I installed (what I felt to be an over sized unit) just to ensure that the generator had enough capacity if additional circuits were to be added in the future, although I don't think that's likely, at least not in the near future. My house was built in 2010.

Regards,

Gene

P.S.
I neglected to mention that I have a 200 amp service feed at my house.

.
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MEC
They do bundle a 200A ATS with the 11kW.
That being said I have yet to install one of those packages.
Most of the houses with 200A services require a larger generator or you would need a ton of load shed modules. Which when you run the numbers it is quite a bit cheaper to go with the larger generator.
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redman
I have used the gen ready 200 amp switch with smaller generators, like that switch, its pretty simple to install and can be nema 3 r or inside.
Works really good with older houses with old type fuse boxes and panels located in hallways, staircases, bedrooms and basements.
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Birken Vogt
redman;35397 wrote:
I have used the gen ready 200 amp switch with smaller generators, like that switch, its pretty simple to install and can be nema 3 r or inside.
Works really good with older houses with old type fuse boxes and panels located in hallways, staircases, bedrooms and basements.


You mean the one with the actuator that moves 2 different breaker handles or some other product? It is hard to keep these products straight in my mind....
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patmurphey
It isn't the panel rating or the switch rating. It's the load calculation. My house has a 200 amp service and the 200 amp service entrance switch with a 10kw (9kwNG) generator. My load shedding is for an electric dryer and an electric oven. I wanted the most economical generator to buy [U]and[/U] to run. (I added shedding to a 50 amp branch circuit to the garage, mostly unused by me, but to make the house safe for a future buyer.) With mostly gas appliances, 9kw and a 200 amp service entrance switch mounted outside works better and was more economical to install than a switch sub-panel, where I would have to permanently decide between the oven or dryer, and lose garage door openers on the sub-panel.
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