Yout wire nuts should never loosen up by just bending wires and stuffing them in the box.Scary stuff.This should tell you that your not installing them properly.First,make sure both(or 3)(no more than 3) of the wires are stripped the same length and will be encased in the nut after tightening.Have them all nice and straight and all standing right next to each other and especially,have all the ends at the same position.Twist your nut while firmly holding all the wires and don't let go of the wires until your have the nut pretty secure.Twist it as hard as you can by hand until the wires actually start to twist.A couple electricians I know will actually finish twisting larger gauge (12,10 and up) with lineman pliers.Lastly,pull on all each wire
to see if it stays connected.I've had a more than a few pull out when I thought they were tight.That loose wire is exactly what you don't want and this is an easy check to see that they are securely fastened.
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SIKSUKR
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