BASIC WIRING OF A POWER DISCONNECT SWITCH

Wiring Basics for Electrical Disconnect Switches
This describes the basic wiring setup for a separate disconnect breaker switch. Warning: Disconnects receive 240 volts and lethal current from feeder lines coming from the utility meter. The feeders and the terminals they connect to on the disconnect switch are live at all times unless the utility has shut off the power to your service.
How to Wire a Disconnect Switch | eHow
Wiring your disconnect switch will vary slightly from one type of switch to another. Depending on whether you have a 110V or 220V circuit, you will have either 3 or 4 wires. One will ground (a bare copper or green wire), one will be neutral (a white wire), and one or two will be hot wires (black or a combination of black and red).