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I've not seen a pink and black wire-combo. Does that mean it's low voltage? here is a pic...doorbell

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    \$\begingroup\$ If you look at your electrical panel there's a good chance you'll find a "doorbell transformer" attached. If you locate it, it should be marked with its voltage rating. You can also check with a digital multimeter. \$\endgroup\$ – K H Feb 28 at 4:39
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    \$\begingroup\$ Most common was a 24 Vac “doorbell”transformer. \$\endgroup\$ – Tony Stewart EE75 Feb 28 at 4:55
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You should not rely on wire color to indicate voltage but yes, that doorbell is low voltage (<50 V). If there is any doubt, measure it with a meter.

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