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1 Conductor weight â Sag of the conductor is directly proportional to its weight. The weight of the conductors is increased due to ice loading. 2  Span â Sag is directly proportional to the square of the span length. Longer span gives more sag.  Tension -The sag is inversely proportional to the tension in the conductor.
1 The supply sag created by the power transformer resistance lowers not only the plate voltage, but the screen voltage as well, since the screen is nearly always a filtered version of the supply going to the plate.