Wiring electrical devices requires a certain amount of experience, but with proper preparation, the novice can successfully perform simple wiring tasks. Observing a few basic steps and following proper safety practices are the basics for wiring most home equipment. A familiarity with electrical tools and their uses is not hard to develop. Some knowledge of basic electronics and the ability to read simple wiring diagrams is needed, but with proper research and a little practice, the average do-it-yourselfer can develop basic wiring skills.
Things You'll Need
Locate the main breaker box and turn off the power to the wires you will be connecting. Put on safety glasses and test the wires at the well pressure switch with a voltmeter to confirm they have no voltage. Place paper tape on the wires and label them "feed from breaker box." Locate the wires coming from the pump or well, put paper tape on them and mark as "wires from pump or well."
Remove the cover from the well pressure switch and locate the four terminal screws in a row. Locate the uninsulated ground lug or terminal on the housing of the well pressure switch. Loosen all of the terminal screws enough to place the wires under them.
Insert the wires from the breaker box into the well pressure switch housing, leaving enough slack to place them under the terminal screws. Insert the wires from the well or pump (the wires marked "from pump or well") in the same manner.
Locate the bare copper wire or ground wire from both groups of wires and connect them to the ground lug or terminal on the well pressure switch housing. Tighten the ground terminal firmly.
Strip one half inch of insulation off the end of the red wire from the breaker box and place it under the first terminal screw. Tighten the terminal screw snugly. Strip the red wire from the well or pump in the same manner and place it under the second terminal screw.
Strip one half inch of insulation from the end of the black wire from the breaker box and place it under the third terminal screw. Tighten the terminal screw snugly. Strip the black wire from the well or pump in the same manner and place it under the fourth terminal screw.
Check all connections for proper order. Check all terminal screws for proper tension. Restore power at the breaker box. Listen for a click at the well pressure switch which will indicate power is restored to the pump and water is being restored to the system.
Never work on electrical devices while the power is on.