### Question
How is the "class A external power supply" defined?


### Answer
The term **class A external power supply** is defined in *42 U.S.C. § 6291* as follows -

> a device that—


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

#### Citation:
  - *42 U.S.C. § 6291*
  - Heading: **CHAPTER 77-ENERGY CONSERVATION > SUBCHAPTER III-IMPROVING ENERGY EFFICIENCY > Part A-Energy Conservation Program for Consumer Products Other Than Automobiles**

