Historical
IEC 60601-2-31 Ed. 1.0 b:1994
Medical electrical equipment - Part 2: Particular requirements for the safety of external cardiac pacemakers with internal power source
Specifies the particular safety requirements for external pacemakers powered by an internal electrical power source. Applies also to patient cables but does not apply to equipment which can be directly or indirectly connected to a supply mains.
International Electrotechnical Commission [iec]