We have recently looked at safety for working on live equipment. The problem is to find 'suitable precautions' as required by the regulations.
RCD's do not mix well with the filter circuits in IT equipment, so a separate circuit may be necessary for the workshop pc's. A full ring circuit RDC will probably trip at 30mA, which is rather high for personal safety.
My inclination is to use an isolation transformer when working on live portable equipment.
Warning notices, locked doors, permit-to-work, second person - all should be considered but may not be suitable or required in view of the risks.
Mark
