It is not advisable. Our 20A products have a type of receptacle that allows 20A devices to be plugged in to it making it possible for a 20A device to be plugged into 15A service. The 15A breaker would probably trip daily as most OEM specified devices, such as MFPs, usually work at the top end of their ratings. Many 20A devices pull a consistent 18+ A. A quick hit of over 15A would not trip the 15A breaker, but a solid 18A would definitely trip. If the breaker were to malfunction and not trip, the 15A rated ROMEX in the wall would heat up under the 20A load posing a fire hazard.
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