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Secondary Circuits, Voltage Test and Clearance/Creepage

#1
Hello all, I would like to hear your opinions and help me to clarify some doubts of some 60601-1 clauses.
We have an internally 12V battery powered device which connects to a class II ac-dc charger to a.c. mains similar like mobile phone while charging. According to cl. 8.9.1.12, which category shall I use to design the air clearance and creepage in my device (such as nominal mains voltage, overvotlage category used to define the value based on the table 13, 14)?
Thank you!
 
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