I agree with FMadera only call it when they are close to the attack line when they hit the ball, or close to being over the net if they happen to be in front of the attack line.
I will add one thing to that, I call it every time the Libero contacts the ball over her head (like an attack) sending it to the other side of the net. Since she can't contact the ball over the height of the net anywhere on the court I signal "safe" no matter where she is in reguards to the attack line, thus stating the obvious that I judge the ball was below the height of the net when she contacted it.
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