When you are working with electrical wires and circuits, you want to make sure that every wire is connected to something or safely terminated so it won't harm anyone or anything. One of the best ways to terminate a stranded wire is to use a wire nut. Wire nuts cap the end of the wire to prevent it from contacting anything and causing a shock or electrical fire.
Verify the power is turned off at the main service panel. The circuit breakers are labeled inside the door of the service panel to help identify the breaker that is supplying power to the wiring to be terminated.
Locate the wire that is to be terminated. Turn on the electrical probe tester. Touch the tester to the wire to determine if the power has been turned off and the wire is safe to handle. If no lights on the tester light up, the wire is safe. If the lights on the tester light up, the wire is still "hot," and steps 1 and 2 must be repeated until the wire is safe.
Strip one inch of insulation off the stranded wire, using the wire strippers.
Insert the end of the stranded wire into the end of one wire nut. Twist the wire nut in a clockwise direction to tighten it on the wire and terminate the end.
Wrap the wire nut and wire with electrical tape to ensure the nut is secure on the end of the wire.
Turn the power back on to the circuit as needed.