We have a device that includes an enclosure at the end of a 10 foot cable. The earth impedance, with the 10 foot cable is less than .1 ohm and the enclosure is protectively earthed. An important customer is now requesting a 30 ft cable. The 30 foot cable increases the earth impedance above .1 ohms. Clause 8.6.4b allows impedance above .1 ohms, if allowable leakage currents are not exceeded when the relevant insulation is shorted. When I do this, I get a DC leakage current of 118 uA, exceeding the limit of 50 uA. Annex A indicates that the low limit is because prolonged current could cause tissue necrosis. In this case the patient would not be in contact with the device for more than 10 minutes if everything was working. In this SFC, the device will not function and patient would not likely remain in contact for even that long. I can't imagine that this is dangerous. Do you think I could justify through risk analysis that the DC leakage current is not hazardous?