IEC EN 60601 3rd edition CF vs. CFD

Can anyone shed some insight into the difference in requirements between an applied part designated as type CF/BF and type CFD/BFD (i.e. DEFIBRILLATION PROOF) when it comes to dielectric strength and creepage and clearance requirements?

From what I can gather, a creepage or clearance that forms either a single means of protection or multiple means of protection must be at least 4mm.

Additionally, it seems the dielectric strength tests are the same for type CF/BF and CFD/BFD applied parts.

From what I can gather, a creepage or clearance that forms either a single means of protection or multiple means of protection must be at least 4mm.

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That´s right. The rationale is that the typical defibrillator (note that this typical defibrillator must comply with IEC 60601-2-4) deals a short-time pulse so 4 mm distances are adequate.

Additionally, it seems the dielectric strength tests are the same for type CF/BF and CFD/BFD applied parts.

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Please note that the working voltage determination does not take into account the defibrillation voltages, so yes, the tests would be the same.

Also, the test of 8.5.5 is a kind of dielectric strenght test for determing separation, and is considered enough to these types of applied part.