Just a few precautions--- Leakage current values must be measured per the appropriate standard. Ref IEC-950 Annex D and G. An impedance is placed in series with the current path simulating an adult human body, with bypass capacitors to emphasize human sensitivity to mid-range frequencies. Simply placing a current probe around the green-wire will yield an incorrect result.
RMS currents cannot be added directly. If you measure several parallel currents the effective value is the square-root of the sum of the squares. Finally, check Table 17 in IEC-950. Different classes of equipment are permitted different leakage levels, to as great as 5% of line-current for equipment that is hard-wired, or connected with 'industrial' plugs. These would require a caution label alerting to high leakage currents. Industrial plugs are such as the twist-lock NEMA WD-5 L5-30P (USA, 125v, 30A 2-pole, 3-wire, locking) or other uncommon connectors not likely to be plugged to an 'ordinary' outlet. bobdb @ vnet.ibm.com
