Common mode choke polarity not marked

[cupoftea]

Hi, this ACM4520 common mode choke says "no polarity" at the schem symbol.

https://product.tdk.com/system/files/dam/doc/product/emc/emc/cmf_cmc/catalog/cmf_commercial_power_acm4520_en.pdf

do you know what they mean by this. We wish to see a symbol with the usual two dots.

 

[betwixt]

I think it means it doesn't matter which way around you fit it. The component, like all common mode chokes is symmetrical as far as signal goes. As long as you connect the input and output at opposite sides it should be fine. Wire it the other way and the results may be 'interesting' (but predictable!)

Brian.

 

[cupoftea]

Thanks, i must admit i still like to see dots, just in case they wound it in a "Non-normal" way. But i guess i'm a little odd like that.