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class A external power supply

Defined in 1 place of the United States Code.

In general.—The term "class A external power supply" means a device that—

(I) is designed to convert line voltage AC input into lower voltage AC or DC output;

(II) is able to convert to only 1 AC or DC output voltage at a time;

(III) is sold with, or intended to be used with, a separate end-use product that constitutes the primary load;

(IV) is contained in a separate physical enclosure from the end-use product;

(V) is connected to the end-use product via a removable or hard-wired male/female electrical connection, cable, cord, or other wiring; and

(VI) has nameplate output power that is less than or equal to 250 watts.

Source

The term “class A external power supply” means a device that—

(I) is designed to convert line voltage AC input into lower voltage AC or DC output;

(II) is able to convert to only 1 AC or DC output voltage at a time;

(III) is sold with, or intended to be used with, a separate end-use product that constitutes the primary load;

(IV) is contained in a separate physical enclosure from the end-use product;

(V) is connected to the end-use product via a removable or hard-wired male/female electrical connection, cable, cord, or other wiring; and

(VI) has nameplate output power that is less than or equal to 250 watts.

Source