In the United States, the voltage of typical wall outlets is 120 Vac (RMS). Maximum current draw is 15 A or 20 A. Is this "maximum" expressed in terms of **RMS** or **peak**? The "maximum" seems to imply peak.

Extension to this question: If I plug multiple devices into a power strip with a 15 A fuse, should I be worried about the **total peak** current or **total RMS** current of the devices?