Why am I experiencing lower than expected Electricity readings?

If the Sensor clamps are a tight fit and are not closing properly (small air gap between the ferrite cores) then you could get lower readings than expected.  

If you have 25mm2 CSA cable that is just a little too large for the standard Sensors due to the thickness of the insulation you should repositioning them on a straight length of the cable as a slight kink/bend in the cable will stop the Sensor clamp closing properly.
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