100 Amp 240-Volt Non-Fused Emergency Power Transfer Switch

A:  This transfer switch includes an insulated neutral busbar (with three 250 MCM lugs) and an optional grounding bonding screw for the busbar. You can install your own grounding lug or grounding busbar if necessary.

A:  This switch is good for up to 100A. There is no minimum. The size of your generator, whether it's a 20A, or 40A or whatever, depends on what you plan to power during a power outage. Also keep in mind that your utility supplies 240V split phase thats divided into two 120V lines. If you buy a single phase 120V generator you'll have to feed it into both lines into your home. That means your stove, water heater, dryer, or any other 240V appliance will not work. I have a 30A single phase generator to power my refrigerator, run a couple lamps and my TV.

A:  8,000 - 10,000 watts

A:  Mine is wired to a 12KW solar electric system. 10-325 watt panels, a 250 volt dc charge controller, and 2-6000 watt inverters on one side. And a 33KW diesel generator on the other. Assuming you are trying to run a house, or at least specific loads in a house, the size of the generator has to be matched to the load(s). A few lights, fridge, and some outlets 4KW. The entire house with AC/Furnace, etc anywhere from 7KW to 20W+.

A:  I would say a 120v/240v 6,000 watt generator with a 30 amp 120v/240v with neutral and ground receptacle on the generator if your just wanting to use this transfer switch outside to take care of inside panel in emergency situations . You would use inside two pole breaker located on your outside box take that feed to load side of transfer switch then run cable from same breaker to line side of transfer switch to complete the circuit to be in normal position up to get power back on . Then set a 50 amp weather proof twist lock receptacle under transfer switch and run cable to bottom load side of the transfer switch so in an emergency switch lever down . Make sure generator is running before you transfer to emergency so that you will  have full 120v/240v . You will also have to buy or make the correct cord wire size and length from generator preferably protected from weather hazards to your hook up. Then after emergency is over and you have normal power back on transfer back to normal up position then shut generator off . Hope this information was helpful cause I could write a book and explain more since I am an electrician but your original question was minimum size generator but if you live up North probably want to get 15,000 watt generator with a 50 amp hook up to help in colder weather