If the UPS has a 20a plug, you really need a 20a circuit (i.e., a 5-20 receptacle). If you have a 5-15 recep, you have a 15a circuit and (hopefully! a 15a breaker.

3) Supplemental arc protection circuit breaker installed at the origin of the branch circuit, plus a listed outlet branch circuit-type AFCI installed at the first outlet box on the branch circuit.

The improper wiring of a water heater to a three-pin plug by workers unlicensed to do electrical work after a Housing Board upgrading programme was behind the death of a 15-year-old boy, who was ...

In disbelief, I pulled the datasheet for the 20A type THOL circuit breaker that was substituted. I noticed that at − 20°F ambient temperature, the let through current of the breaker is approximately ...

The improper wiring of a water heater to a three-pin plug by workers unlicensed to do electrical work after a Housing Board upgrading programme was behind the death of a 15-year-old boy, who was ...

The purpose of a 15A breaker is to protect WIRING that can handle 15A continuously. Such current does not burn down your house, or even damage the wiring if you put 20A through it for a minute.