I encounter sayings like this everywhere:
RFI interference is unintentional radiation from sources such as electric power transmission lines.
My confusion comes from my following thinking:
1-) First of all, power transmission lines work with 50/60Hz which is not radio frequency.
2-) Electric power transmission lines produce electromagnetic fields not radiation like antennas, so calling it radiofrequency interference doesn't make sense to me. It should be called electromagnetic field interference?
I'm sure I have lack of knowledge somewhere but couldn't figure out.