Class II Diagnostics Medical Device: Grounding the chassis or not?

marmotte

Involved In Discussions
#1
Hi there,

I have a specific question I can't really sort out by myself.
I am developing a device (diagnostics) which uses a separate OTS classII PSU (0-12V DC).

I am wondering whether I should leave the chassis "floating" or attach it to the the 0V (or even the + 12V). Both strategies can be dealt with from an electronics point of view, but how about the 601 point of view?
The chassis is not an applied part, but an accessible part.

Thanks a lot for any advice.
 
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Marcelo

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#2
Re: Class II device: grounding the chassis or not?

It depends on which version of IEC 60601 you´re using, whether you use grounding or not, and also on other factors.

Historically, there´s a problem with floating circuits in the second edition of IEC 60601, mainly due to the definition of "live" parts. The third edition tried to fix this by removing the "live" definition and some other sutble changes. You can read on that in Annex A of the third edition (Annex A - Clause 8).

I´ve also attached an interesting article by RIch Nute which is not available online anymore, i think, called "Floating Circuits - Protection against electric shock".

Anyway, my suggestion would be to ground the chassis, not to float or attach it to any secondary. Although from an electronics point of view it can make sense (and in fact some equipment, for example ultrasound, may need a secondary connection for proper functioning), it might get you in trouble.
 

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