Relay ground loop "hum" - not present when using mechanical switch

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hi!

i'm trying switch 1 of 3 internal wires run phone in house.
when mechanical switch , introduce break in wire, attach 1 side 1 pin of switch , other side of break other pin, things work unexpected.

if use arduino controlled relay, awful deep hum on line (ground loop?).

i had understood switched connectors on relay independent rest of circuit, being controlled electromagnet had supposed didn't touch.

does know how might able rid hum, or if it's reason part , parcel?

thanks

can draw circuit showing setup?


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