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Carambola's suggestion makes sense. The vom (volt/ohm) meter you are using is probably digital. An Analog meter isn't as sensitive and actually shows you a more accurate working voltage. Conduits fill with water in most applications. That is why the wire insulation is rated for this. THHN and THWN provide insulation for wires that are in conduits that normally fill up with water.
You have a circuit that has high resistance and if it isn't at the terminals at either end... Pull a new conductor.
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