I am going to guess what you mean. My best guess is you are looking for the wire size. Are we talking about a 13.8kv feed to a business or a home water heater @240v. I may get into trouble here (but I will deal with it) DO YOUR OWN HOMEWORK! Now that I got that off my chest. Electricians are pros and know what they are doing. If you have to ask call a pro!...pkazsr
30A switch for what? Are you trying to switch a dryer? Are you wiring a heavy-duty disconnect for an air-conditioner or a spa? Please explain what you are trying to do. This question smacks strongly of ignorance. Hire an electrician if wiring a switch is outside of your skill set, espacially if you are switching high current loads.
You would need to use a transfer switch. The generator will hook up to the transfer switch and then the transfer switch to the panel. Usually you would have an emergency breaker panel to hook up to since a 7000 watt generator wouldn't be able to power up most entire homes. You would pick which circuits you would need in an emergency situation and bring those into the emergency panel. The transfer switch makes sure you never have generator power mixing with your houses main power.
to shut the fans on and off by yourself. remove the connector for the wires at the fan. hook a wire from the positive on fan motor to the inside toggle switch, do not hook to switch yet. run a wire from the positive on battery, hook to battery after hooking up switch. hook up the wires to the switch. then the battery. its up to you if you want to install a 15 amp fuse in line from battery to toggle switch.. you can also get the power from the fuse box instead of the battery. this should work for you. if not you may need to ground the other fan wire.
If you can get to the starter, you hook up one side of the switch to the terminal that goes to the battery and the other side of the switch to the small terminal marked with and "S". "S" is for starter. The other small terminal you leave alone. Applying power to this terminal will damage the starter.
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