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Earthing system (IT, TT or TN) and IEC 60601 Requirements

F

fonk140

#1
Does the type of earthing system used in a hospital (TT, IT ot TN) affects the electrical safety of the medical device?

As far as i know the 60601 never specifies the type of earthing system but for example in a TT connection a short between mains and earth maybe wouldn't blow the fuse of the device doesn't it?

I don't know if what im saying makes sense or not but i would appreciate any comments.

Thanks in advance!
 
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Peter Selvey

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#3
IEC 60601-1 assumes the worst case, for example leakage currents assume an earthed neutral which results in the highest values.

If the mains is floating from earth, and there is a Line - Earth fault in the equipment, this is not a hazard since it just pulls the line to earth potential which should be the same potential as other earthed objects in environment (other equipment, plumbing, ground).

If the environment earthing is not reliable, and a fault occurs, it could be an issue.
 
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