How much loss can be expected in wire from main panel to subpanel? Is 3% OK?

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How much loss can be expected in wire from main panel to subpanel? Is 3% OK?

Discuss How much loss can be expected in wire from main panel to subpanel? Is 3% OK? in the Electrical Appliances Forum area at ElectriciansForums.net

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I am monitoring my subpanel with a CT monitor and the utility meter with a Zigby reader.

The meter shows consistently 3% higher. So it is either normal loss in the wire, or the utility is overcharging, or the CT monitor is inaccurate.

The breaker for the sub-panel is 90A.

Could anyone recommend a device with known power draw, so I can use it as a test load to trouble shoot? I could use Kill a Watt, but I am not sure about its precision.
 

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