Dear Sir, The secondary of an AC current transformer such as the CRGFS-100 is modeled as an AC current source. As such, increased resistance from longer wire lengths causes the current source to increase its voltage output to maintain the current level. Therefore typically you can add wire length up to the point where the CT can develop enough voltage. The burden presented to the CRGFS is quite high, so adding wire with a series resistance of less than 10 ohms should perform adequately. As for shielded cable, this would help to limit common signal errors (same error on both wires), but typically since the signal is a current, a twisted pair is sufficient for minimal noise figure.
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