Adopts IEC 60601-2-4:2005 to specify requirements for the safety of cardiac defibrillators. Does not apply to implantable defibrillators, remote control defibrillators, external transcutaneous pacemakers, or separate stand alone cardiac monitors. Cardiac monitors which use separate ECG monitoring electrodes are not within the scope of the Standard unless they are used as the sole basis for AED rhythm recognition detection or beat detection for synchronized cardioversion.