IEC 60601-1-1 - Stress test, reference voltage

Nick_EMC

Starting to get Involved
#1
Hi All,
I have a quick question, but I do not find it easy to find a definite answer to.

In 60601-1-1 there is a reference voltage U used to determine the voltage of the electrical stress tests across barriers. My understanding is the peak or DC voltage is used for this, however it seems previously this has been taken to be RMS. SO for normal 240V mains I would take U to be 339V.

Might there be a difference between Issue 2 and 3? Issue 2 is still used in China.

Thanks
Nick
 
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Peter Selvey

Staff member
Moderator
#2
U is U, in the sense that it is just voltage waveform.

Whether you take the peak or rms of U (or both) depends on the particular clause / table.

In any case, for patient protection, the tests for 230V or 240V there are well established values which haven't changed from Ed 2 to Ed 3, for example if U = 240Vms, the test is 1500Vrms for testing for mains to earth for patient protection, 4000Vrms for reinforced again for patient protection.

Main difference in the 3rd edition for this point is they now separate out operator protection, and it uses the 1kV/3kV values from IEC 60950-1 for 230-240V equipment, i.e. lower than before.
 

Nick_EMC

Starting to get Involved
#3
Hi Peter,
Thanks for your reply. I think I have resolved things now. At the start of Ed 2 there is a statement saying 'Voltage' implies RMS and this has cleared up my confusion and now the Ed 3 and 4 limits align.
Regards
Nick
 
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