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How to understand the exception of IEC 60601 sub-clause 8.11.5

Roland chung

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#1
Hi all,

As you may know, there is an exception in sub-clause 8.11.5. The rationale indicates that this exception usually applies to small plug-in power supply, such as linear adaptors.

It is not uncommon that a built-in thermal cut-out is employed by the linear adaptors. Such thermal cut-out is intended to prevent overheating of the transformer during the short circuit and overload conditions. But it can never serve as a fuse which intended to prevent the circuit breaker in the installation from operating, thus removing the mains power to other medical equipment (the intent of 8.11.5).

In addition, the 2MOPs requirement stated in 8.11.5 must be continued up to and within any component within the mains part. This said the linear transformer also needs to be examined. It is however obvious that the enamelled primary windings will fail the 2MOPs requirement.

It seems difficult to apply this exception even to plug-in power supply. What is your opinion?

Thanks,
Roland
 
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