Value of Clearance and creepage

Question

Hello 
 Our customer will use ADuM6402. 
 Could you give me your advice what do below difference of value of clearance and creepage mean ? 
 VDE document downloaded on your web site says below. 
 Clearance: Over 8.5mm 
 Creepage: Over 8.5mm 
 (Please refer attached file P.16 psition 76) 
 ADuM6402 datasheet P.9 table 16 says below 
 Clearance: 8.0mm 
 Creepage 7.6mm ( RW16 package) , 8.3mm(RI16 package) 
 Regards, 
 Terumasa

ADIApproved · Accepted Answer

Terumasa-san: Sorry for the delay. I received a response back from our certification expert: 
 The two agencies do their own measurements, and arrive at different values. CSA is more conservative. Unless the customer is tied to a certification agency, they can probably pick the one that fits his application best. 
 
 Regards, Brian)

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Value of Clearance and creepage