21 C.F.R. § 898.12 – Performance standard.

(a) Any connector in a cable or electrode lead wire having a conductive connection to a patient shall be constructed in such a manner as to comply with subclause 56.3(c) of the following standard:
International Electrotechnical Commission (IEC) 601-1: Medical Electrical Equipment 601-1 (1988) Part 1: General requirements for safety Amendment No. 1 (1991) Amendment No. 2 (1995).
(b) Compliance with the standard shall be determined by inspection and by applying the test requirements and test methods of subclause 56.3(c) of the standard set forth in paragraph (a) of this section.