### Question
How does the law define medium screw base?


### Answer
Under *42 U.S.C. § 6291*, **medium screw base** is defined as:

> an Edison screw base identified with the prefix E–26 in the "American National Standard for Electric Lamp Bases", ANSI/IEC C81.61–2003, published by the American National Standards Institute

#### 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**

