Electricians have been using a test current of 200mA for many years now and probably perform more tests than we do with medical equipment. They have never felt the need to resort to an arc welder to test the safety of their work! I don't think there has been a flood of people receiving an electric shock as a result of the low current used.
@RoJo - If you don't have a good earth, due to rusty conduit, then an RCD will provide you with protection. They work on a differential principle so any imbalance in current will trip them.
IEC60364-7-710 calls for either an IT supply or RCD for use in medical locations so is valid for almost all the world.
The test current debate for PE testing is long running but normally the use of a low current is safer than using a high current. But in all cases there is no benefit in using more than 10A. A failure at 200mA can normally be removed by simply un-plugging and re-inserting the IEC lead so is no big deal as this is a better way of removing the oxidisation than welding the contacts with 25A! In fact there is a good chance it indicates a new IEC lead may be a good idea!
Insulation testing can be performed by all meters I have found on the sale but many medical equipment manufacturers do not recommend the use of an insulation test as it is possible to damage them if they use transient suppressors. If you want a test to check the dielectric then use the IEC 62353 Alternative equipment leakage test in place of the insulation test.
After all you don't know if the DUT is fitted with transient suppressors!
