Just for Colin Tate's benefit I'd like to mention that when non-medical equipment is connected to a medical device (by common mains distribution or functional connection) that the system, combined, becomes a medical system.
A non-medical device with or without an accessible earth must be tested to it's own non-medical safety standard or comparable methods, since it must be safe, and also CE marked, to be allowed to connect to medical devices.
It must also be tested as part of the interconnected medical system (to meet 60601-1, 60601-1-1 or as the manufacturer stipulates on installation, or as is indicated in the certificate of conformance, or type-testing certificate, if provided).
Incidentally a mains powered device that has no protective earth but a functional one (or even a device that is internally powered), that is connected to a Class 1 system and is exposed, will be tested to Class 1. There is no way to avoid this since we're obliged to probe accessible, conductive, parts for continuity/leakage under various test conditions.
So Colin, irrespective of whether parts of a medical system are medical or non-medical, if we can't use medical device testers that give reliable and meaningful continuity readings, at 1A test current or less, then no, we don't need 1A continuity test current or less when testing medical devices & systems (or any other Class 1 device for that matter, in my opinion).
Not unless there's an explicit warning or indication on the equipment (whether its got a functional or protective earth, or not) that a higher earth continuity test current is damaging or until testers are improved upon to give more reliable, meaningful, results at 1A or less (irrespective of whether the source problem is with wetting currents or poor contacts).
