Two means of patient protection

[muhammad sadiq]

Hi, i have three questions related to the below configuration.

we are using a medical grade power supply that provides us 2 MOPPS from the mains supply, now we want to add a DPST switch on which one side is AC and the other 24V (see figure below), does doing this cause issues in claiming 2MOPPS since we are again bringing AC and DC (isolated- 2MOPP) closer together through a switch which itself does not claim any MOPPS.

Secondly - we are using an AC inlet that provides us 2MOPPS(CLASS II), even if the MOPPS of power supply are getting compromised since we are bringing AC and DC close to each other, will the 2 MOPPs of the AC inlet be enough to comply with the 2 MOPPs clause between MAINs and patient.

Thirdly - if we use an AC inlet that provides us 2MOPPS and then use a simpler AC-DC converter (not the one that provides us with any means of protection), will i still have two MOPPS from Mains to Patient because of AC inlet MOPPS

FYI - the AC inlet is FN9274MB-10-05 Schaffner EMC Inc. | Connectors, Interconnects | DigiKey

 

[Peter Selvey]

All the proposals are wrong, but it would take too long to explain.

You should have an electrical engineer on staff or contract that can understand why these don't make sense and takes responsibility for the design of the electrical insulation. It would not be good to rely on a forum for this kind of thing.