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Generator Transfer Switch
Installing a house generator. Can anyone tell me a little about the automatic transfer switch. install?
I have everything connected except for the transfer switch to the house. I just want to make sure I am doing this correctly.
What kind of automatic transfer switch do you have? Does it have a built-in loadcenter (panel)? Is it a weatherproof one with a built-in main breaker?
Depending on the brand of generator that you have, this will probably not be a DIY project. Generac generators comes with very good DIY installation instructions for their 7kW - 16kW generators. They prefer to have their larger generators installed by a professional.
If your transfer switch has a built-in loadcenter (panel), I recommend installing it right next to your existing breaker box. You need to install a conduit between your transfer switch and generator. In this conduit, you will run your 2 - hots, 1-neutral and 1-ground for the power from the generator. Additionally, depending on the requirements, you need to install a minimum of 2 conductors that sense utility power and allow the generator to start.
The conduit size depends on the size of wire and number of conductors in the conduit. The wire size is determined from the generator size. All of these specifications should be in your installation instructions.
You also need to install a conduit between your transfer switch and existing breaker box. In this conduit, you need the utility power to feed the transfer switch and the circuits that you want your generator to control during an outage. These circuits are already in your existing breaker box, you just need to transfer them into your transfer switch.
Don't forget to ground your generator. The instructions will have the specifications for grounding. Typically, you need to drive an 8' x 5/8" ground rod next to the generator and connect a #6 bare copper wire between the ground rod and a lug provided on the generator's frame.
As I mentioned earlier, this is not really a DIY project. If you are unsure of any of the steps involved, I highly recommend hiring a licensed electrician. If you are going to do this yourself, definately get an inspection when you are done, just to be sure.
Be sure to check with your local building codes to see if they have any additional requirements. I also recommend getting the 2005 edition of the NEC and read Article 445.
If you need further assistance, please visit -
http://electricalblog.gilchrist-electric.com
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